snake fix

Firmware/.gitignore

@@ -2,4 +2,5 @@ build
 cmake-build*
 .idea
 .cache
-managed_components
+managed_components
+*.gb

Firmware/AGENTS.md

@@ -1,4 +1,4 @@
 To build:
-(in zsh)
+(in zsh, bash doesn't work)
 . "$HOME/esp/esp-idf/export.sh"
 idf.py build

Firmware/cardboy-companion/.gitignore

@@ -0,0 +1,62 @@
+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## User settings
+xcuserdata/
+
+## Obj-C/Swift specific
+*.hmap
+
+## App packaging
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+#
+# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
+# Packages/
+# Package.pins
+# Package.resolved
+# *.xcodeproj
+#
+# Xcode automatically generates this directory with a .xcworkspacedata file and xcuserdata
+# hence it is not needed unless you have added a package configuration file to your project
+# .swiftpm
+
+.build/
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+#
+# Pods/
+#
+# Add this line if you want to avoid checking in source code from the Xcode workspace
+# *.xcworkspace
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build/
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo.
+# Instead, use fastlane to re-generate the screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots/**/*.png
+fastlane/test_output

Firmware/cardboy-companion/README.md

@@ -0,0 +1,89 @@
+# Cardboy Time Sync Companion
+
+This SwiftUI app connects to the Cardboy device over Bluetooth Low Energy and updates its wall clock using the custom time sync service exposed by the firmware. The sources live inside the existing `cardboy-companion/cardboy-companion.xcodeproj` so you can open and run them directly in Xcode.
+
+## Requirements
+
+- Xcode 15 or newer
+- iOS 16 or newer deployment target (can be lowered to 15 with minor API tweaks)
+- A Cardboy running firmware that includes the BLE time sync service
+
+## How it works
+
+1. The app scans for peripherals exposing service UUID `00000001-CA7B-4EFD-B5A6-10C3F4D3F230`.
+2. Once connected it discovers characteristic `00000002-CA7B-4EFD-B5A6-10C3F4D3F231`.
+3. Tapping **Sync Now** writes a 12‑byte payload containing:
+   - 8 bytes Unix epoch seconds (little endian)
+   - 2 bytes time zone offset in minutes from UTC (little endian)
+   - 1 byte DST flag (`1` if daylight saving is active)
+   - 1 reserved byte (`0`)
+4. The firmware applies the timestamp with `settimeofday()` and updates the TZ environment variable so the clock app renders local time.
+
+## Usage
+
+1. Open `cardboy-companion/cardboy-companion.xcodeproj` in Xcode.
+2. Ensure the `CoreBluetooth` capability is enabled for the `cardboy-companion` target and keep the *Uses Bluetooth LE accessories* background mode on (preconfigured in this project).
+3. Build & run on a real device (BLE is not available in the simulator).
+4. Allow Bluetooth permissions when prompted. The app keeps scanning in the background, so the Cardboy can request a sync even while the companion is not foregrounded. Tap **Sync Now** any time you want to trigger a manual refresh.
+5. Switch to the **Files** tab to browse the LittleFS volume on the Cardboy: you can upload ROMs from the Files picker, create/remove folders, rename entries, delete files, and download items back to the phone for sharing.
+
+## BLE File Service Protocol
+
+The ESP firmware exposes a custom GATT service (UUID `00000010-CA7B-4EFD-B5A6-10C3F4D3F230`) with two characteristics:
+
+| Characteristic | UUID | Properties | Direction | Description |
+| --- | --- | --- | --- | --- |
+| File Command | `00000011-CA7B-4EFD-B5A6-10C3F4D3F231` | Write / Write Without Response | iOS → ESP | Sends file management requests |
+| File Response | `00000012-CA7B-4EFD-B5A6-10C3F4D3F232` | Notify | ESP → iOS | Streams command results (responses or data) |
+
+All payloads share the same framing. Commands written to the File Command characteristic use:
+
+```
+Offset | Size | Description
+-------+------+------------
+0      | 1    | Opcode (see table below)
+1      | 1    | Reserved (set to 0)
+2      | 2    | Little-endian payload length in bytes (N)
+4      | N    | Command payload
+```
+
+Notifications from the File Response characteristic use:
+
+```
+Offset | Size | Description
+-------+------+------------
+0      | 1    | Opcode (echoed from command)
+1      | 1    | Status byte (bit 7 = completion flag; lower 7 bits = error code)
+2      | 2    | Little-endian payload length (N)
+4      | N    | Response payload (command-specific)
+```
+
+Status byte semantics:
+- Bit 7 (0x80) set → final packet for the current command (no further fragments).
+- Lower 7 bits = error code (`0` = success, otherwise `errno`-style code echoed back).
+  - On error the response payload may contain a UTF-8 message.
+
+### Opcodes and Payloads
+
+| Opcode | Name | Command Payload | Response Payload |
+| --- | --- | --- | --- |
+| `0x01` | List Directory | `uint16 path_len` + UTF-8 path | One or more fragments, each entry encoded as:<br> - `uint8 type` (0=file, 1=dir)<br> - `uint8 reserved`<br> - `uint16 name_len`<br> - `uint32 size` (0 for dirs)<br> - `name_len` bytes UTF-8 name<br> Final notification has completion bit set. |
+| `0x02` | Upload Begin | `uint16 path_len` + UTF-8 path + `uint32 file_size` | Empty payload on success. Starts upload session (expects `UploadChunk` packets). |
+| `0x03` | Upload Chunk | Raw file bytes | Empty payload ack for each chunk. |
+| `0x04` | Upload End | No payload | Empty payload confirming completion. |
+| `0x05` | Download Request | `uint16 path_len` + UTF-8 path | First notification: 4-byte little-endian total file size; subsequent notifications stream raw file data fragments. Completion bit marks the final chunk. |
+| `0x06` | Delete File | `uint16 path_len` + UTF-8 path | Empty payload on success. |
+| `0x07` | Create Directory | `uint16 path_len` + UTF-8 path | Empty payload on success. |
+| `0x08` | Delete Directory | `uint16 path_len` + UTF-8 path | Empty payload on success. |
+| `0x09` | Rename Path | `uint16 src_len` + UTF-8 source path + `uint16 dst_len` + UTF-8 destination path | Empty payload on success. |
+
+### Notes
+
+- Paths are absolute within the LittleFS volume; the firmware normalizes them and rejects entries containing `..`.
+- Large responses (directory lists, downloads) may arrive in multiple notifications; the iOS client aggregates fragments until it sees the completion flag.
+- Uploads are initiated with `Upload Begin` (including total size), followed by one or more `Upload Chunk` writes, and `Upload End` when done.
+- Errors from the firmware propagate via the status byte; when `status & 0x7F != 0`, the notification payload typically includes a UTF-8 error message (e.g., `"stat failed"`).
+
+This protocol mirrors the implementation in `components/backend-esp/src/time_sync_service.cpp` and the Swift client in `TimeSyncManager.swift`. Update both sides if new commands are added.
+
+Optionally bundle this code into your existing app—`TimeSyncManager` is self‑contained and can be reused.

Firmware/cardboy-companion/cardboy-companion/cardboy-companion.xcodeproj/project.pbxproj

@@ -0,0 +1,358 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 77;
+	objects = {
+
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+/* End PBXFileReference section */
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+			membershipExceptions = (
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+			files = (
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+			children = (
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+				);
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+				INFOPLIST_KEY_NSBluetoothAlwaysUsageDescription = "Cardboy Companion needs Bluetooth to sync time with your handheld.";
+				INFOPLIST_KEY_NSBluetoothPeripheralUsageDescription = "Cardboy Companion needs Bluetooth to sync time with your handheld.";
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+				LD_RUNPATH_SEARCH_PATHS = (
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+				);
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+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
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+				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPhone = "UIInterfaceOrientationPortrait UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
+				LD_RUNPATH_SEARCH_PATHS = (
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+				);
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+			buildConfigurations = (
+				ECAB9A8C2EA550DB004BA9DE /* Debug */,
+				ECAB9A8D2EA550DB004BA9DE /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		ECAB9A8E2EA550DB004BA9DE /* Build configuration list for PBXNativeTarget "cardboy-companion" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				ECAB9A8F2EA550DB004BA9DE /* Debug */,
+				ECAB9A902EA550DB004BA9DE /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = ECAB9A7B2EA550D9004BA9DE /* Project object */;
+}

Firmware/cardboy-companion/cardboy-companion/cardboy-companion.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

Firmware/cardboy-companion/cardboy-companion/cardboy-companion/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Firmware/cardboy-companion/cardboy-companion/cardboy-companion/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,14 @@
+{
+  "images" : [
+    {
+      "filename" : "cardboy-icon.png",
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Firmware/cardboy-companion/cardboy-companion/cardboy-companion/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Firmware/cardboy-companion/cardboy-companion/cardboy-companion/ContentView.swift

@@ -0,0 +1,548 @@
+import Combine
+import SwiftUI
+import UIKit
+import UniformTypeIdentifiers
+
+struct ContentView: View {
+    @EnvironmentObject private var manager: TimeSyncManager
+    @State private var selectedTab = 0
+    @State private var shareURL: URL?
+    @State private var errorWrapper: ErrorWrapper?
+
+    var body: some View {
+        TabView(selection: $selectedTab) {
+            TimeSyncTabView()
+                .tabItem { Label("Clock", systemImage: "clock.arrow.circlepath") }
+                .tag(0)
+
+            FileManagerTabView(shareURL: $shareURL, errorWrapper: $errorWrapper)
+                .tabItem { Label("Files", systemImage: "folder") }
+                .tag(1)
+        }
+        .sheet(item: $shareURL) { url in
+            ShareSheet(items: [url])
+        }
+        .alert(item: $errorWrapper) { wrapper in
+            Alert(title: Text("Error"), message: Text(wrapper.message), dismissButton: .default(Text("OK")))
+        }
+        .onReceive(manager.$fileErrorMessage.compactMap { $0 }) { message in
+            errorWrapper = ErrorWrapper(message: message)
+            manager.fileErrorMessage = nil
+        }
+        .onReceive(manager.$downloadedFileURL.compactMap { $0 }) { url in
+            shareURL = url
+            manager.downloadedFileURL = nil
+        }
+    }
+}
+
+private struct ErrorWrapper: Identifiable {
+    let id = UUID()
+    let message: String
+}
+
+private struct TimeSyncTabView: View {
+    @EnvironmentObject private var manager: TimeSyncManager
+
+    private var formattedLastSync: String {
+        guard let date = manager.lastSyncDate else { return "Never" }
+        let formatter = DateFormatter()
+        formatter.dateStyle = .medium
+        formatter.timeStyle = .medium
+        return formatter.string(from: date)
+    }
+
+    var body: some View {
+        VStack(spacing: 24) {
+            Text("Cardboy Clock Sync")
+                .font(.title.bold())
+
+            VStack(spacing: 12) {
+                Text("State: \(manager.connectionState.rawValue)")
+                    .font(.headline)
+
+                Text(manager.statusMessage)
+                    .multilineTextAlignment(.center)
+                    .foregroundColor(.secondary)
+
+                HStack(spacing: 16) {
+                    Button(action: manager.sendCurrentTime) {
+                        Label("Sync Now", systemImage: "clock.arrow.2.circlepath")
+                    }
+                    .buttonStyle(.borderedProminent)
+                    .disabled(manager.connectionState != .ready)
+
+                    Button(action: manager.forceRescan) {
+                        Label("Rescan", systemImage: "dot.radiowaves.left.and.right")
+                    }
+                    .buttonStyle(.bordered)
+                }
+
+                Button(action: manager.sendTestNotification) {
+                    Label("Send Test Notification", systemImage: "bell.badge.waveform")
+                }
+                .buttonStyle(.bordered)
+            }
+
+            VStack(spacing: 8) {
+                Text("Last Sync:")
+                    .font(.caption)
+                    .foregroundColor(.secondary)
+                Text(formattedLastSync)
+                    .font(.body.monospaced())
+            }
+
+            Spacer()
+        }
+        .padding()
+    }
+}
+
+private struct FileManagerTabView: View {
+    @EnvironmentObject private var manager: TimeSyncManager
+    @Binding var shareURL: URL?
+    @Binding var errorWrapper: ErrorWrapper?
+
+    @State private var navigationPath: [String] = []
+
+    var body: some View {
+        ZStack {
+            NavigationStack(path: $navigationPath) {
+                DirectoryView(
+                    path: "/",
+                    navigationPath: $navigationPath,
+                    shareURL: $shareURL,
+                    errorWrapper: $errorWrapper
+                )
+                .navigationDestination(for: String.self) { destination in
+                    DirectoryView(
+                        path: destination,
+                        navigationPath: $navigationPath,
+                        shareURL: $shareURL,
+                        errorWrapper: $errorWrapper
+                    )
+                }
+            }
+
+            if let operation = manager.activeFileOperation {
+                FileOperationHUD(operation: operation)
+            }
+
+            if manager.connectionState != .ready {
+                ConnectionOverlay(
+                    state: manager.connectionState,
+                    statusMessage: manager.statusMessage,
+                    retryAction: manager.forceRescan
+                )
+            }
+        }
+        .onAppear {
+            if manager.currentDirectory != "/" {
+                manager.changeDirectory(to: "/")
+            }
+            navigationPath = stackForPath(manager.currentDirectory)
+        }
+        .onChange(of: manager.currentDirectory) { newValue in
+            let desired = stackForPath(newValue)
+            if desired != navigationPath {
+                navigationPath = desired
+            }
+        }
+        .onChange(of: navigationPath) { newValue in
+            let target = newValue.last ?? "/"
+            if target != manager.currentDirectory {
+                manager.changeDirectory(to: target)
+            }
+        }
+        .onChange(of: manager.connectionState) { newState in
+            if newState == .ready, !manager.isFileBusy {
+                manager.refreshDirectory()
+            }
+        }
+    }
+}
+
+private struct DirectoryView: View {
+    let path: String
+    @Binding var navigationPath: [String]
+    @Binding var shareURL: URL?
+    @Binding var errorWrapper: ErrorWrapper?
+
+    @EnvironmentObject private var manager: TimeSyncManager
+
+    @State private var showingImporter = false
+    @State private var showingNewFolderSheet = false
+    @State private var showingRenameSheet = false
+    @State private var newFolderName = ""
+    @State private var renameText = ""
+    @State private var renameTarget: TimeSyncManager.RemoteFileEntry?
+
+    private var pathSegments: [(name: String, fullPath: String)] {
+        var segments: [(String, String)] = []
+        var current = ""
+        for component in path.split(separator: "/").map(String.init) {
+            current += "/" + component
+            segments.append((component, current))
+        }
+        return segments
+    }
+
+    private var displayTitle: String {
+        pathSegments.last?.name ?? "Files"
+    }
+
+    var body: some View {
+        ZStack {
+            VStack(alignment: .leading, spacing: 12) {
+                HStack {
+                    Text("Path:")
+                        .font(.headline)
+                    ScrollView(.horizontal, showsIndicators: false) {
+                        HStack(spacing: 4) {
+                            Button(action: { navigationPath = [] }) {
+                                Text("/")
+                            }
+                            .buttonStyle(.bordered)
+
+                            ForEach(Array(pathSegments.enumerated()), id: \.element.fullPath) { index, segment in
+                                Button(action: {
+                                    navigationPath = Array(pathSegments.prefix(index + 1).map(\.fullPath))
+                                }) {
+                                    Text(segment.name)
+                                }
+                                .buttonStyle(.bordered)
+                            }
+                        }
+                    }
+                }
+                .padding(.horizontal)
+
+                List {
+                    ForEach(manager.directoryEntries) { entry in
+                        if entry.isDirectory {
+                            NavigationLink(value: entry.path) {
+                                FileRow(entry: entry)
+                            }
+                            .contextMenu {
+                                Button("Open") {
+                                    navigationPath = stackForPath(entry.path)
+                                }
+
+                                Button("Rename") {
+                                    renameTarget = entry
+                                    renameText = entry.name
+                                    showingRenameSheet = true
+                                }
+
+                                Button(role: .destructive) {
+                                    manager.delete(entry: entry)
+                                } label: {
+                                    Text("Delete")
+                                }
+                            }
+                        } else {
+                            FileRow(entry: entry)
+                                .contextMenu {
+                                    Button("Download") {
+                                        manager.download(entry: entry) { result in
+                                            switch result {
+                                            case .success(let url):
+                                                shareURL = url
+                                            case .failure(let error):
+                                                errorWrapper = ErrorWrapper(message: error.localizedDescription)
+                                            }
+                                        }
+                                    }
+
+                                    Button("Rename") {
+                                        renameTarget = entry
+                                        renameText = entry.name
+                                        showingRenameSheet = true
+                                    }
+
+                                    Button(role: .destructive) {
+                                        manager.delete(entry: entry)
+                                    } label: {
+                                        Text("Delete")
+                                    }
+                                }
+                        }
+                    }
+                }
+                .listStyle(.plain)
+
+                HStack(spacing: 12) {
+                    Menu {
+                        Button {
+                            showingImporter = true
+                        } label: {
+                            Label("Upload File", systemImage: "square.and.arrow.up")
+                        }
+
+                        Button {
+                            showingNewFolderSheet = true
+                            newFolderName = ""
+                        } label: {
+                            Label("New Folder", systemImage: "folder.badge.plus")
+                        }
+                    } label: {
+                        Label("Actions", systemImage: "ellipsis.circle")
+                    }
+                    .buttonStyle(.bordered)
+                    .controlSize(.large)
+
+                    Spacer()
+
+                    Button {
+                        manager.refreshDirectory()
+                    } label: {
+                        Label("Refresh", systemImage: "arrow.clockwise")
+                    }
+                    .buttonStyle(.borderedProminent)
+                    .controlSize(.large)
+                }
+                .padding([.horizontal, .bottom])
+            }
+
+        }
+        .navigationTitle(displayTitle)
+        .navigationBarTitleDisplayMode(.inline)
+        .onAppear {
+            if manager.currentDirectory != path {
+                manager.changeDirectory(to: path)
+            } else {
+                manager.refreshDirectory()
+            }
+        }
+        .fileImporter(
+            isPresented: $showingImporter,
+            allowedContentTypes: [.data],
+            allowsMultipleSelection: false
+        ) { result in
+            switch result {
+            case .success(let urls):
+                guard let url = urls.first else { return }
+                manager.uploadFile(from: url) { uploadResult in
+                    if case let .failure(error) = uploadResult {
+                        errorWrapper = ErrorWrapper(message: error.localizedDescription)
+                    }
+                }
+            case .failure(let error):
+                errorWrapper = ErrorWrapper(message: error.localizedDescription)
+            }
+        }
+        .sheet(isPresented: $showingNewFolderSheet) {
+            NavigationView {
+                Form {
+                    Section(header: Text("Folder Name")) {
+                        TextField("Name", text: $newFolderName)
+                            .autocapitalization(.none)
+                    }
+                }
+                .navigationTitle("New Folder")
+                .toolbar {
+                    ToolbarItem(placement: .cancellationAction) {
+                        Button("Cancel") { showingNewFolderSheet = false }
+                    }
+                    ToolbarItem(placement: .confirmationAction) {
+                        Button("Create") {
+                            let name = newFolderName.trimmingCharacters(in: .whitespacesAndNewlines)
+                            if !name.isEmpty {
+                                manager.createDirectory(named: name)
+                            }
+                            showingNewFolderSheet = false
+                        }
+                    }
+                }
+            }
+        }
+        .sheet(isPresented: $showingRenameSheet) {
+            NavigationView {
+                Form {
+                    Section(header: Text("New Name")) {
+                        TextField("Name", text: $renameText)
+                            .autocapitalization(.none)
+                    }
+                }
+                .navigationTitle("Rename")
+                .toolbar {
+                    ToolbarItem(placement: .cancellationAction) {
+                        Button("Cancel") { showingRenameSheet = false }
+                    }
+                    ToolbarItem(placement: .confirmationAction) {
+                        Button("Rename") {
+                            if let target = renameTarget {
+                                let newName = renameText.trimmingCharacters(in: .whitespacesAndNewlines)
+                                if !newName.isEmpty {
+                                    manager.rename(entry: target, to: newName)
+                                }
+                            }
+                            showingRenameSheet = false
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+private func stackForPath(_ path: String) -> [String] {
+    guard path != "/" else { return [] }
+    var stack: [String] = []
+    var current = ""
+    for component in path.split(separator: "/").map(String.init) {
+        current += "/" + component
+        stack.append(current)
+    }
+    return stack
+}
+
+private struct FileRow: View {
+    let entry: TimeSyncManager.RemoteFileEntry
+
+    private var iconName: String {
+        entry.isDirectory ? "folder" : "doc.text"
+    }
+
+    private var formattedSize: String {
+        guard !entry.isDirectory else { return "" }
+        let byteCountFormatter = ByteCountFormatter()
+        byteCountFormatter.allowedUnits = [.useKB, .useMB, .useGB]
+        byteCountFormatter.countStyle = .file
+        return byteCountFormatter.string(fromByteCount: Int64(entry.size))
+    }
+
+    var body: some View {
+        HStack {
+            Image(systemName: iconName)
+                .foregroundColor(entry.isDirectory ? .accentColor : .primary)
+            VStack(alignment: .leading) {
+                Text(entry.name)
+                    .fontWeight(entry.isDirectory ? .semibold : .regular)
+                if !entry.isDirectory, !formattedSize.isEmpty {
+                    Text(formattedSize)
+                        .font(.caption)
+                        .foregroundColor(.secondary)
+                }
+            }
+            Spacer()
+        }
+        .padding(.vertical, 4)
+    }
+}
+
+private struct ShareSheet: UIViewControllerRepresentable {
+    let items: [Any]
+
+    func makeUIViewController(context: Context) -> UIActivityViewController {
+        UIActivityViewController(activityItems: items, applicationActivities: nil)
+    }
+
+    func updateUIViewController(_ uiViewController: UIActivityViewController, context: Context) {}
+}
+
+private struct FileOperationHUD: View {
+    let operation: TimeSyncManager.FileOperationProgress
+
+    var body: some View {
+        ZStack {
+            Color.black.opacity(0.3)
+                .ignoresSafeArea()
+
+            VStack(spacing: 12) {
+                Text(operation.title)
+                    .font(.headline)
+                Text(operation.message)
+                    .font(.subheadline)
+                    .multilineTextAlignment(.center)
+                    .foregroundColor(.secondary)
+
+                if let progress = operation.progress {
+                    ProgressView(value: progress)
+                        .progressViewStyle(.linear)
+                        .frame(maxWidth: 240)
+                    Text("\(Int(progress * 100))%")
+                        .font(.caption.monospacedDigit())
+                        .foregroundColor(.secondary)
+                } else {
+                    ProgressView()
+                        .progressViewStyle(.circular)
+                }
+            }
+            .padding(24)
+            .background(.ultraThinMaterial)
+            .cornerRadius(16)
+            .shadow(radius: 10)
+            .padding()
+        }
+        .transition(.opacity)
+    }
+}
+
+private struct ConnectionOverlay: View {
+    let state: TimeSyncManager.ConnectionState
+    let statusMessage: String
+    let retryAction: () -> Void
+
+    private var showsSpinner: Bool {
+        switch state {
+        case .scanning, .connecting, .discovering:
+            return true
+        default:
+            return false
+        }
+    }
+
+    private var canRetry: Bool {
+        switch state {
+        case .failed, .idle:
+            return true
+        default:
+            return false
+        }
+    }
+
+    var body: some View {
+        ZStack {
+            Color.black.opacity(0.35)
+                .ignoresSafeArea()
+
+            VStack(spacing: 16) {
+                if showsSpinner {
+                    ProgressView()
+                        .progressViewStyle(.circular)
+                        .scaleEffect(1.2)
+                } else {
+                    Image(systemName: "exclamationmark.triangle")
+                        .font(.system(size: 42, weight: .semibold))
+                        .foregroundColor(.yellow)
+                }
+
+                Text(statusMessage)
+                    .multilineTextAlignment(.center)
+                    .font(.headline)
+                    .foregroundColor(.primary)
+
+                if canRetry {
+                    Button("Try Again", action: retryAction)
+                        .buttonStyle(.borderedProminent)
+                }
+            }
+            .padding(28)
+            .frame(maxWidth: 320)
+            .background(.ultraThinMaterial)
+            .cornerRadius(20)
+            .shadow(radius: 12)
+        }
+        .transition(.opacity)
+    }
+}
+
+extension URL: Identifiable {
+    public var id: String { absoluteString }
+}
+
+#Preview {
+    ContentView()
+        .environmentObject(TimeSyncManager())
+}

Firmware/cardboy-companion/cardboy-companion/cardboy-companion/Info.plist

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>bluetooth-central</string>
+	</array>
+	<key>NSUserNotificationUsageDescription</key>
+	<string>Allow Cardboy Companion to send local notifications for testing.</string>
+</dict>
+</plist>

Firmware/cardboy-companion/cardboy-companion/cardboy-companion/cardboy_companionApp.swift

@@ -0,0 +1,13 @@
+import SwiftUI
+
+@main
+struct cardboy_companionApp: App {
+    @StateObject private var manager = TimeSyncManager()
+
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+                .environmentObject(manager)
+        }
+    }
+}

Firmware/components/backend-esp/CMakeLists.txt

@@ -4,12 +4,12 @@ idf_component_register(
         "src/buttons.cpp"
         "src/buzzer.cpp"
         "src/esp_backend.cpp"
-        "src/event_bus.cpp"
         "src/display.cpp"
         "src/fs_helper.cpp"
         "src/i2c_global.cpp"
         "src/shutdowner.cpp"
         "src/spi_global.cpp"
+        "src/time_sync_service.cpp"
         INCLUDE_DIRS
         "include"
         PRIV_REQUIRES
@@ -19,6 +19,7 @@ idf_component_register(
         esp_driver_spi
         littlefs
         nvs_flash
+        bt 
 )
 
 add_subdirectory("${CMAKE_CURRENT_LIST_DIR}/../../sdk/utils" cardboy_utils_esp)

Firmware/components/backend-esp/include/cardboy/backend/esp/bat_mon.hpp

@@ -18,6 +18,7 @@ public:
     float          get_voltage() const;
     float          get_charge() const;
     float          get_current() const;
+    float          get_percentage() const;
 
     void pooler(); // FIXME:
 private:
@@ -33,6 +34,7 @@ private:
     volatile float _voltage;
     volatile float _current;
     volatile float _charge;
+    volatile float _percentage;
 
     TaskHandle_t _pooler_task;
 };

Firmware/components/backend-esp/include/cardboy/backend/esp/buttons.hpp

@@ -5,9 +5,10 @@
 #ifndef BUTTONS_HPP
 #define BUTTONS_HPP
 
-#include "cardboy/sdk/event_bus.hpp"
-
 #include <cstdint>
+
+#include "cardboy/sdk/input_state.hpp"
+#include "cardboy/sdk/services.hpp"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
 
@@ -24,20 +25,19 @@ typedef enum {
 
 class Buttons {
 public:
-    static Buttons& get();
-    void            pooler(); // FIXME:
-    uint8_t         get_pressed();
-    void            install_isr();
-    void            register_listener(TaskHandle_t task);
-    void            setEventBus(cardboy::sdk::IEventBus* bus);
+    static Buttons&          get();
+    void                     pooler(); // FIXME:
+    uint8_t                  get_pressed();
+    cardboy::sdk::InputState get_state();
+    void                     install_isr();
+    void                     setEventBus(cardboy::sdk::IEventBus* bus);
 
     TaskHandle_t _pooler_task;
 
 private:
     Buttons();
-
+    uint8_t                  _previous;
     volatile uint8_t         _current;
-    volatile TaskHandle_t    _listener = nullptr;
     cardboy::sdk::IEventBus* _eventBus = nullptr;
 };
 

Firmware/components/backend-esp/include/cardboy/backend/esp/event_bus.hpp

@@ -1,27 +0,0 @@
-#pragma once
-
-#include <cardboy/sdk/event_bus.hpp>
-
-#include "freertos/FreeRTOS.h"
-#include "freertos/event_groups.h"
-#include "freertos/timers.h"
-
-namespace cardboy::backend::esp {
-
-class EventBus final : public cardboy::sdk::IEventBus {
-public:
-    EventBus();
-    ~EventBus() override;
-
-    void          signal(std::uint32_t bits) override;
-    void          signalFromISR(std::uint32_t bits) override;
-    std::uint32_t wait(std::uint32_t mask, std::uint32_t timeout_ms) override;
-    void          scheduleTimerSignal(std::uint32_t delay_ms) override;
-    void          cancelTimerSignal() override;
-
-private:
-    EventGroupHandle_t group;
-    TimerHandle_t      timer;
-};
-
-} // namespace cardboy::backend::esp

Firmware/components/backend-esp/include/cardboy/backend/esp/time_sync_service.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+namespace cardboy::sdk {
+class INotificationCenter;
+} // namespace cardboy::sdk
+
+namespace cardboy::backend::esp {
+
+/**
+ * Ensure the BLE time synchronisation service is running.
+ *
+ * Safe to call multiple times; subsequent calls become no-ops once the
+ * service has been started successfully.
+ */
+void ensure_time_sync_service_started();
+
+/**
+ * Stop the BLE time synchronisation service if it is running.
+ * A no-op on platforms that do not support the BLE implementation.
+ */
+void shutdown_time_sync_service();
+
+/**
+ * Provide a notification sink that receives mirrored notifications from iOS.
+ * Passing nullptr disables mirroring.
+ */
+void set_notification_center(cardboy::sdk::INotificationCenter* center);
+
+} // namespace cardboy::backend::esp

Firmware/components/backend-esp/include/cardboy/backend/esp_backend.hpp

@@ -2,7 +2,6 @@
 
 #include <cardboy/sdk/display_spec.hpp>
 #include "cardboy/backend/esp/display.hpp"
-#include "cardboy/backend/esp/event_bus.hpp"
 #include "cardboy/sdk/platform.hpp"
 #include "cardboy/sdk/services.hpp"
 
@@ -61,17 +60,24 @@ private:
     class HighResClockService;
     class FilesystemService;
     class LoopHooksService;
+    class NotificationService;
+    class TimerService;
+    class EventBus;
+    class AppScopedServices;
+    class AppServiceProvider;
 
-    std::unique_ptr<BuzzerService>       buzzerService;
-    std::unique_ptr<BatteryService>      batteryService;
-    std::unique_ptr<StorageService>      storageService;
-    std::unique_ptr<RandomService>       randomService;
-    std::unique_ptr<HighResClockService> highResClockService;
-    std::unique_ptr<FilesystemService>   filesystemService;
-    std::unique_ptr<EventBus>            eventBus;
-    std::unique_ptr<LoopHooksService>    loopHooksService;
+    std::unique_ptr<BuzzerService>       _buzzerService;
+    std::unique_ptr<BatteryService>      _batteryService;
+    std::unique_ptr<StorageService>      _storageService;
+    std::unique_ptr<RandomService>       _randomService;
+    std::unique_ptr<HighResClockService> _highResClockService;
+    std::unique_ptr<FilesystemService>   _filesystemService;
+    std::unique_ptr<EventBus>            _eventBus;
+    std::unique_ptr<LoopHooksService>    _loopHooksService;
+    std::unique_ptr<NotificationService> _notificationService;
+    std::unique_ptr<AppServiceProvider> _appServiceProvider;
 
-    cardboy::sdk::Services services{};
+    cardboy::sdk::Services _services{};
 };
 
 struct Backend {

Firmware/components/backend-esp/src/bat_mon.cpp

@@ -48,6 +48,8 @@ static constexpr uint16_t DesignCapMah = 180; // 100mOhm
 
 constexpr float mahToCap(float mah) { return mah * (1000.0 / 5.0) * RSense; }
 constexpr float capToMah(uint16_t cap) { return cap * (5.0 / 1000.0) / RSense; }
+// lsb is 1/256%
+constexpr float regToPercent(uint16_t reg) { return static_cast<float>(reg) / 256.0f; }
 constexpr float regToCurrent(uint16_t reg) {
     return static_cast<float>(static_cast<int16_t>(reg)) * 0.0015625f / RSense; // Convert to mA
 }
@@ -103,6 +105,7 @@ void BatMon::pooler() {
         _charge  = capToMah(ReadRegister(0x05));
         _current = regToCurrent(ReadRegister(0x0B));
         _voltage = regToVoltage(ReadRegister(0x09));
+        _percentage = regToPercent(ReadRegister(0x06));
         vTaskDelay(pdMS_TO_TICKS(10000));
         if (_voltage < 3.0f) {
             Shutdowner::get().shutdown();
@@ -113,3 +116,4 @@ void BatMon::pooler() {
 float BatMon::get_voltage() const { return _voltage; }
 float BatMon::get_charge() const { return _charge; }
 float BatMon::get_current() const { return _current; }
+float BatMon::get_percentage() const { return _percentage; }

Firmware/components/backend-esp/src/buttons.cpp

@@ -13,7 +13,6 @@
 
 #include "cardboy/backend/esp/config.hpp"
 #include "cardboy/backend/esp/i2c_global.hpp"
-#include "cardboy/sdk/event_bus.hpp"
 
 static i2c_master_dev_handle_t    dev_handle;
 static inline i2c_device_config_t dev_cfg = {
@@ -76,6 +75,28 @@ static void delay(unsigned long long loop) {
     }
 }
 
+static cardboy::sdk::InputState buttons_to_input_state(uint8_t pressed) {
+    cardboy::sdk::InputState state{};
+    if (pressed & BTN_UP)
+        state.up = true;
+    if (pressed & BTN_LEFT)
+        state.left = true;
+    if (pressed & BTN_RIGHT)
+        state.right = true;
+    if (pressed & BTN_DOWN)
+        state.down = true;
+    if (pressed & BTN_A)
+        state.a = true;
+    if (pressed & BTN_B)
+        state.b = true;
+    if (pressed & BTN_SELECT)
+        state.select = true;
+    if (pressed & BTN_START)
+        state.start = true;
+    return state;
+}
+
+
 void Buttons::pooler() {
     while (true) {
         BaseType_t xResult = xTaskNotifyWait(pdFALSE, ULONG_MAX, nullptr, portMAX_DELAY);
@@ -88,15 +109,27 @@ void Buttons::pooler() {
         reg = 1;
         ESP_ERROR_CHECK(
                 i2c_master_transmit_receive(dev_handle, &reg, sizeof(reg), reinterpret_cast<uint8_t*>(&buffer), 1, -1));
-        if (_listener)
-            xTaskNotifyGive(_listener);
-        if (_eventBus)
-            _eventBus->signal(cardboy::sdk::to_event_bits(cardboy::sdk::EventBusSignal::Input));
+
+
+        if (_eventBus) {
+            cardboy::sdk::AppButtonEvent button{};
+            button.current  = buttons_to_input_state(_current);
+            button.previous = buttons_to_input_state(_previous);
+            _previous       = _current;
+
+            cardboy::sdk::AppEvent evt{};
+
+            // TODO: dedup?
+            TickType_t ticks = xTaskGetTickCount();
+            auto now = static_cast<std::uint32_t>((static_cast<std::uint64_t>(ticks) * 1000ULL) / configTICK_RATE_HZ);
+
+            evt.timestamp_ms = now;
+            evt.data         = button;
+            _eventBus->post(evt);
+        }
     }
 }
-uint8_t Buttons::get_pressed() { return _current; }
-void    Buttons::install_isr() { gpio_isr_handler_add(EXP_INT, wakeup, nullptr); }
-
-void Buttons::register_listener(TaskHandle_t task) { _listener = task; }
-
-void Buttons::setEventBus(cardboy::sdk::IEventBus* bus) { _eventBus = bus; }
+uint8_t                  Buttons::get_pressed() { return _current; }
+void                     Buttons::install_isr() { gpio_isr_handler_add(EXP_INT, wakeup, nullptr); }
+cardboy::sdk::InputState Buttons::get_state() { return buttons_to_input_state(get_pressed()); }
+void                     Buttons::setEventBus(cardboy::sdk::IEventBus* bus) { _eventBus = bus; }

Firmware/components/backend-esp/src/esp_backend.cpp

@@ -9,6 +9,7 @@
 #include "cardboy/backend/esp/i2c_global.hpp"
 #include "cardboy/backend/esp/shutdowner.hpp"
 #include "cardboy/backend/esp/spi_global.hpp"
+#include "cardboy/backend/esp/time_sync_service.hpp"
 
 #include "cardboy/sdk/display_spec.hpp"
 
@@ -17,14 +18,22 @@
 #include "esp_random.h"
 #include "esp_timer.h"
 #include "freertos/FreeRTOS.h"
+#include "freertos/semphr.h"
 #include "freertos/task.h"
+#include "freertos/timers.h"
 #include "nvs.h"
 #include "nvs_flash.h"
 
 #include <algorithm>
+#include <atomic>
 #include <cstdint>
+#include <ctime>
+#include <deque>
+#include <list>
+#include <mutex>
 #include <string>
 #include <string_view>
+#include <vector>
 
 namespace cardboy::backend::esp {
 
@@ -36,6 +45,7 @@ void ensureNvsInit() {
 
     esp_err_t err = nvs_flash_init();
     if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+        printf("Erasing flash!\n");
         ESP_ERROR_CHECK(nvs_flash_erase());
         err = nvs_flash_init();
     }
@@ -68,6 +78,7 @@ public:
     [[nodiscard]] float voltage() const override { return BatMon::get().get_voltage(); }
     [[nodiscard]] float charge() const override { return BatMon::get().get_charge(); }
     [[nodiscard]] float current() const override { return BatMon::get().get_current(); }
+    [[nodiscard]] float percentage() const override { return BatMon::get().get_percentage(); }
 };
 
 class EspRuntime::StorageService final : public cardboy::sdk::IStorage {
@@ -126,33 +137,396 @@ public:
     void onLoopIteration() override { vTaskDelay(1); }
 };
 
+class EspRuntime::EventBus final : public cardboy::sdk::IEventBus {
+public:
+    explicit EventBus() {
+        _queueHandle =
+                xQueueCreateStatic(_kMaxQueueSize, sizeof(cardboy::sdk::AppEvent), _queueStorage.data(), &_queue);
+    }
+
+    ~EventBus() override { vQueueDelete(_queueHandle); }
+    void post(const sdk::AppEvent& event) override { xQueueSendToBack(_queueHandle, &event, portMAX_DELAY); }
+    std::optional<sdk::AppEvent> pop(std::optional<std::uint32_t> timeout_ms = std::nullopt) override {
+        sdk::AppEvent out;
+        TickType_t    ticks = timeout_ms ? pdMS_TO_TICKS(*timeout_ms) : portMAX_DELAY;
+        if (xQueueReceive(_queueHandle, &out, ticks) == pdTRUE) {
+            return out;
+        }
+        return std::nullopt;
+    }
+
+private:
+    static constexpr std::uint32_t                                _kMaxQueueSize = 32;
+    StaticQueue_t                                                 _queue;
+    std::array<std::uint8_t, 32 * sizeof(cardboy::sdk::AppEvent)> _queueStorage{};
+    QueueHandle_t                                                 _queueHandle;
+};
+
+
+class EspRuntime::TimerService final : public cardboy::sdk::ITimerService {
+public:
+    explicit TimerService(cardboy::sdk::IEventBus& appBus);
+    ~TimerService() override;
+
+    cardboy::sdk::AppTimerHandle scheduleTimer(std::uint32_t delay_ms, bool repeat) override;
+    void                         cancelTimer(cardboy::sdk::AppTimerHandle handle) override;
+    void                         cancelAllTimers() override;
+
+private:
+    static inline EspRuntime::TimerService* _current = nullptr;
+    struct InitializedSemaphore {
+        InitializedSemaphore() {
+            _handle = xSemaphoreCreateBinary();
+            xSemaphoreGive(_handle);
+        }
+        ~InitializedSemaphore() { vSemaphoreDelete(_handle); }
+
+        SemaphoreHandle_t operator*() { return _handle; }
+        SemaphoreHandle_t operator->() { return _handle; }
+
+    private:
+        SemaphoreHandle_t _handle;
+    };
+    static inline InitializedSemaphore _currentSemaphore;
+
+    struct TimerRecord {
+        TimerService*                owner  = nullptr;
+        TimerHandle_t                timer  = nullptr;
+        cardboy::sdk::AppTimerHandle handle = cardboy::sdk::kInvalidAppTimer;
+        bool                         repeat = false;
+    };
+
+    static void timerCallback(TimerHandle_t timer);
+    void        handleTimer(sdk::AppTimerHandle record);
+
+    cardboy::sdk::IEventBus&         _appEventBus;
+    SemaphoreHandle_t                _mutex;
+    StaticSemaphore_t                _mutexStatic;
+    std::list<TimerRecord>           _timers;
+    std::atomic<sdk::AppTimerHandle> _nextTimerHandle = 1;
+    static_assert(std::atomic<sdk::AppTimerHandle>::is_always_lock_free);
+};
+
+class EspRuntime::AppScopedServices final : public cardboy::sdk::AppScopedServices {
+public:
+    AppScopedServices(std::unique_ptr<TimerService> timer) : _ownedTimer(std::move(timer)) {
+        this->timer = _ownedTimer.get();
+    }
+
+private:
+    std::unique_ptr<TimerService> _ownedTimer;
+};
+
+class EspRuntime::AppServiceProvider final : public cardboy::sdk::IAppServiceProvider {
+public:
+    explicit AppServiceProvider(cardboy::sdk::IEventBus& bus) : eventBus(bus) {}
+
+    [[nodiscard]] std::unique_ptr<cardboy::sdk::AppScopedServices>
+    createScopedServices(std::uint64_t generation) override {
+        (void) generation;
+        auto timer = std::make_unique<TimerService>(eventBus);
+        return std::make_unique<AppScopedServices>(std::move(timer));
+    }
+
+private:
+    cardboy::sdk::IEventBus& eventBus;
+};
+
+class EspRuntime::NotificationService final : public cardboy::sdk::INotificationCenter {
+public:
+    void pushNotification(Notification notification) override {
+        if (notification.timestamp == 0) {
+            notification.timestamp = static_cast<std::uint64_t>(std::time(nullptr));
+        }
+
+        capLengths(notification);
+
+        std::lock_guard<std::mutex> lock(mutex);
+        if (notification.externalId != 0) {
+            for (auto it = entries.begin(); it != entries.end();) {
+                if (it->externalId == notification.externalId)
+                    it = entries.erase(it);
+                else
+                    ++it;
+            }
+        }
+        notification.id     = nextId++;
+        notification.unread = true;
+
+        entries.push_back(std::move(notification));
+        if (entries.size() > kMaxEntries)
+            entries.erase(entries.begin());
+        ++revisionCounter;
+    }
+
+    [[nodiscard]] std::uint32_t revision() const override {
+        std::lock_guard<std::mutex> lock(mutex);
+        return revisionCounter;
+    }
+
+    [[nodiscard]] std::vector<Notification> recent(std::size_t limit) const override {
+        std::lock_guard<std::mutex> lock(mutex);
+        std::vector<Notification>   out;
+        const std::size_t           count = std::min<std::size_t>(limit, entries.size());
+        out.reserve(count);
+        for (std::size_t i = 0; i < count; ++i) {
+            out.push_back(entries[entries.size() - 1 - i]);
+        }
+        return out;
+    }
+
+    void markAllRead() override {
+        std::lock_guard<std::mutex> lock(mutex);
+        bool                        changed = false;
+        for (auto& entry: entries) {
+            if (entry.unread) {
+                entry.unread = false;
+                changed      = true;
+            }
+        }
+        if (changed)
+            ++revisionCounter;
+    }
+
+    void clear() override {
+        std::lock_guard<std::mutex> lock(mutex);
+        if (entries.empty())
+            return;
+        entries.clear();
+        ++revisionCounter;
+    }
+
+    void removeById(std::uint64_t id) override {
+        if (id == 0)
+            return;
+        std::lock_guard<std::mutex> lock(mutex);
+        bool                        removed = false;
+        for (auto it = entries.begin(); it != entries.end();) {
+            if (it->id == id) {
+                it      = entries.erase(it);
+                removed = true;
+            } else {
+                ++it;
+            }
+        }
+        if (removed)
+            ++revisionCounter;
+    }
+
+    void removeByExternalId(std::uint64_t externalId) override {
+        if (externalId == 0)
+            return;
+        std::lock_guard<std::mutex> lock(mutex);
+        bool                        removed = false;
+        for (auto it = entries.begin(); it != entries.end();) {
+            if (it->externalId == externalId) {
+                it      = entries.erase(it);
+                removed = true;
+            } else {
+                ++it;
+            }
+        }
+        if (removed)
+            ++revisionCounter;
+    }
+
+private:
+    static constexpr std::size_t kMaxEntries    = 8;
+    static constexpr std::size_t kMaxTitleBytes = 96;
+    static constexpr std::size_t kMaxBodyBytes  = 256;
+
+    static void capLengths(Notification& notification) {
+        if (notification.title.size() > kMaxTitleBytes)
+            notification.title.resize(kMaxTitleBytes);
+        if (notification.body.size() > kMaxBodyBytes)
+            notification.body.resize(kMaxBodyBytes);
+    }
+
+    mutable std::mutex        mutex;
+    std::vector<Notification> entries;
+    std::uint64_t             nextId          = 1;
+    std::uint32_t             revisionCounter = 0;
+};
+
+EspRuntime::TimerService::TimerService(cardboy::sdk::IEventBus& appBus) : _appEventBus(appBus) {
+    xSemaphoreTake(*_currentSemaphore, portMAX_DELAY);
+    assert(_current == nullptr);
+    _mutex = xSemaphoreCreateBinaryStatic(&_mutexStatic);
+    assert(_mutex);
+    xSemaphoreGive(_mutex);
+    _current = this;
+    xSemaphoreGive(*_currentSemaphore);
+}
+
+EspRuntime::TimerService::~TimerService() {
+    xSemaphoreTake(*_currentSemaphore, portMAX_DELAY);
+    assert(_current == this);
+    _current = nullptr;
+    cancelAllTimers();
+    vSemaphoreDelete(_mutex);
+    xSemaphoreGive(*_currentSemaphore);
+}
+
+cardboy::sdk::AppTimerHandle EspRuntime::TimerService::scheduleTimer(std::uint32_t delay_ms, bool repeat) {
+    TimerRecord record{};
+    record.owner  = this;
+    record.repeat = repeat;
+
+    cardboy::sdk::AppTimerHandle newHandle = cardboy::sdk::kInvalidAppTimer;
+    do {
+        newHandle = _nextTimerHandle++;
+    } while (newHandle == cardboy::sdk::kInvalidAppTimer);
+    if (_nextTimerHandle == cardboy::sdk::kInvalidAppTimer)
+        ++_nextTimerHandle;
+    record.handle = newHandle;
+    xSemaphoreTake(_mutex, portMAX_DELAY);
+    TimerRecord* storedRecord = &_timers.emplace_back(record);
+    xSemaphoreGive(_mutex);
+
+    const TickType_t ticks = std::max<TickType_t>(pdMS_TO_TICKS(delay_ms), 1);
+
+    static_assert(sizeof(void*) >= sizeof(cardboy::sdk::AppTimerHandle));
+
+    TimerHandle_t timerHandle =
+            xTimerCreate("AppSvcTimer", ticks, repeat ? pdTRUE : pdFALSE, reinterpret_cast<void*>(storedRecord->handle),
+                         &TimerService::timerCallback);
+    storedRecord->timer = timerHandle;
+
+    if (xTimerStart(timerHandle, portMAX_DELAY) != pdPASS) {
+        assert(false);
+    }
+
+    return newHandle;
+}
+
+void EspRuntime::TimerService::cancelTimer(cardboy::sdk::AppTimerHandle handle) {
+    assert(handle != sdk::kInvalidAppTimer);
+
+    TimerHandle_t timerHandle = nullptr;
+    {
+        xSemaphoreTake(_mutex, portMAX_DELAY);
+        for (auto it = _timers.begin(); it != _timers.end(); ++it) {
+            if (it->handle == handle) {
+                timerHandle = it->timer;
+                it          = _timers.erase(it);
+            }
+        }
+        xSemaphoreGive(_mutex);
+    }
+
+    if (!timerHandle)
+        return;
+
+    xTimerStop(timerHandle, portMAX_DELAY);
+    xTimerDelete(timerHandle, portMAX_DELAY);
+}
+
+void EspRuntime::TimerService::cancelAllTimers() {
+    if (!_mutex)
+        return;
+
+    std::vector<TimerHandle_t> handles;
+    handles.resize(_timers.size());
+    {
+        xSemaphoreTake(_mutex, portMAX_DELAY);
+        size_t i = 0;
+        for (auto& record: _timers) {
+            if (record.timer) {
+                assert(record.timer);
+                handles[i] = record.timer;
+            }
+            i++;
+        }
+        _timers.clear();
+        xSemaphoreGive(_mutex);
+    }
+
+    for (auto timerHandle: handles) {
+        xTimerStop(timerHandle, portMAX_DELAY);
+        xTimerDelete(timerHandle, portMAX_DELAY);
+    }
+}
+
+void EspRuntime::TimerService::timerCallback(TimerHandle_t timer) {
+    auto handle = reinterpret_cast<sdk::AppTimerHandle>(pvTimerGetTimerID(timer));
+    xSemaphoreTake(*_currentSemaphore, portMAX_DELAY);
+    if (!_current)
+        return;
+    _current->handleTimer(handle);
+    xSemaphoreGive(*_currentSemaphore);
+}
+
+void EspRuntime::TimerService::handleTimer(sdk::AppTimerHandle handle) {
+    TimerHandle_t timerHandle = nullptr;
+    bool          repeat      = false;
+
+    {
+        xSemaphoreTake(_mutex, portMAX_DELAY);
+        for (auto it = _timers.begin(); it != _timers.end(); ++it) {
+            if (it->handle == handle) {
+                timerHandle = it->timer;
+                if (!it->repeat) {
+                    _timers.erase(it);
+                } else {
+                    repeat = true;
+                }
+                break;
+            }
+        }
+        xSemaphoreGive(_mutex);
+    }
+
+    if (!timerHandle) {
+        printf("Couldn't find handle for timer %lu\n", handle);
+        return;
+    }
+    if (!repeat && timerHandle)
+        xTimerDelete(timerHandle, portMAX_DELAY);
+
+    cardboy::sdk::AppTimerEvent timerEvent{};
+    timerEvent.handle = handle;
+
+    cardboy::sdk::AppEvent event{};
+    event.timestamp_ms = static_cast<std::uint32_t>(esp_timer_get_time() / 1000ULL);
+    event.data         = timerEvent;
+    _appEventBus.post(event);
+}
+
 EspRuntime::EspRuntime() : framebuffer(), input(), clock() {
     initializeHardware();
 
-    buzzerService       = std::make_unique<BuzzerService>();
-    batteryService      = std::make_unique<BatteryService>();
-    storageService      = std::make_unique<StorageService>();
-    randomService       = std::make_unique<RandomService>();
-    highResClockService = std::make_unique<HighResClockService>();
-    filesystemService   = std::make_unique<FilesystemService>();
-    eventBus            = std::make_unique<EventBus>();
-    loopHooksService    = std::make_unique<LoopHooksService>();
+    _buzzerService       = std::make_unique<BuzzerService>();
+    _batteryService      = std::make_unique<BatteryService>();
+    _storageService      = std::make_unique<StorageService>();
+    _randomService       = std::make_unique<RandomService>();
+    _highResClockService = std::make_unique<HighResClockService>();
+    _filesystemService   = std::make_unique<FilesystemService>();
+    _eventBus            = std::make_unique<EventBus>();
+    _appServiceProvider  = std::make_unique<AppServiceProvider>(*_eventBus);
+    _loopHooksService    = std::make_unique<LoopHooksService>();
+    _notificationService = std::make_unique<NotificationService>();
 
-    services.buzzer       = buzzerService.get();
-    services.battery      = batteryService.get();
-    services.storage      = storageService.get();
-    services.random       = randomService.get();
-    services.highResClock = highResClockService.get();
-    services.filesystem   = filesystemService.get();
-    services.eventBus     = eventBus.get();
-    services.loopHooks    = loopHooksService.get();
+    _services.buzzer        = _buzzerService.get();
+    _services.battery       = _batteryService.get();
+    _services.storage       = _storageService.get();
+    _services.random        = _randomService.get();
+    _services.highResClock  = _highResClockService.get();
+    _services.filesystem    = _filesystemService.get();
+    _services.eventBus      = _eventBus.get();
+    _services.appServices   = _appServiceProvider.get();
+    _services.loopHooks     = _loopHooksService.get();
+    _services.notifications = _notificationService.get();
 
-    Buttons::get().setEventBus(eventBus.get());
+    Buttons::get().setEventBus(_eventBus.get());
+    set_notification_center(_notificationService.get());
 }
 
-EspRuntime::~EspRuntime() = default;
+EspRuntime::~EspRuntime() {
+    set_notification_center(nullptr);
+    shutdown_time_sync_service();
+}
 
-cardboy::sdk::Services& EspRuntime::serviceRegistry() { return services; }
+cardboy::sdk::Services& EspRuntime::serviceRegistry() { return _services; }
 
 void EspRuntime::initializeHardware() {
     static bool initialized = false;
@@ -180,6 +554,8 @@ void EspRuntime::initializeHardware() {
     Buzzer::get().init();
 
     FsHelper::get().mount();
+
+    ensure_time_sync_service_started();
 }
 
 void EspFramebuffer::clear_impl(bool on) {
@@ -194,27 +570,7 @@ void EspFramebuffer::sendFrame_impl(bool clearAfterSend) { SMD::send_frame(clear
 
 bool EspFramebuffer::frameInFlight_impl() const { return SMD::frame_transfer_in_flight(); }
 
-cardboy::sdk::InputState EspInput::readState_impl() {
-    cardboy::sdk::InputState state{};
-    const uint8_t            pressed = Buttons::get().get_pressed();
-    if (pressed & BTN_UP)
-        state.up = true;
-    if (pressed & BTN_LEFT)
-        state.left = true;
-    if (pressed & BTN_RIGHT)
-        state.right = true;
-    if (pressed & BTN_DOWN)
-        state.down = true;
-    if (pressed & BTN_A)
-        state.a = true;
-    if (pressed & BTN_B)
-        state.b = true;
-    if (pressed & BTN_SELECT)
-        state.select = true;
-    if (pressed & BTN_START)
-        state.start = true;
-    return state;
-}
+cardboy::sdk::InputState EspInput::readState_impl() { return Buttons::get().get_state(); }
 
 std::uint32_t EspClock::millis_impl() {
     TickType_t ticks = xTaskGetTickCount();

Firmware/components/backend-esp/src/event_bus.cpp

@@ -1,81 +0,0 @@
-#include "cardboy/backend/esp/event_bus.hpp"
-
-#include "cardboy/sdk/event_bus.hpp"
-
-#include "freertos/portmacro.h"
-
-#include <algorithm>
-
-namespace cardboy::backend::esp {
-
-namespace {
-[[nodiscard]] TickType_t toTicks(std::uint32_t timeout_ms) {
-    if (timeout_ms == cardboy::sdk::IEventBus::kWaitForever)
-        return portMAX_DELAY;
-    return pdMS_TO_TICKS(timeout_ms);
-}
-} // namespace
-
-static void timerCallback(TimerHandle_t handle) {
-    auto* bus = static_cast<EventBus*>(pvTimerGetTimerID(handle));
-    if (bus)
-        bus->signal(cardboy::sdk::to_event_bits(cardboy::sdk::EventBusSignal::Timer));
-}
-
-EventBus::EventBus() :
-    group(xEventGroupCreate()), timer(xTimerCreate("EventBusTimer", pdMS_TO_TICKS(1), pdFALSE, this, timerCallback)) {}
-
-EventBus::~EventBus() {
-    if (timer)
-        xTimerDelete(timer, portMAX_DELAY);
-    if (group)
-        vEventGroupDelete(group);
-}
-
-void EventBus::signal(std::uint32_t bits) {
-    if (!group || bits == 0)
-        return;
-    xEventGroupSetBits(group, bits);
-}
-
-void EventBus::signalFromISR(std::uint32_t bits) {
-    if (!group || bits == 0)
-        return;
-    BaseType_t higherPriorityTaskWoken = pdFALSE;
-    xEventGroupSetBitsFromISR(group, bits, &higherPriorityTaskWoken);
-    if (higherPriorityTaskWoken == pdTRUE)
-        portYIELD_FROM_ISR(higherPriorityTaskWoken);
-}
-
-std::uint32_t EventBus::wait(std::uint32_t mask, std::uint32_t timeout_ms) {
-    if (!group || mask == 0)
-        return 0;
-    const EventBits_t bits = xEventGroupWaitBits(group, mask, pdTRUE, pdFALSE, toTicks(timeout_ms));
-    return static_cast<std::uint32_t>(bits & mask);
-}
-
-void EventBus::scheduleTimerSignal(std::uint32_t delay_ms) {
-    if (!timer)
-        return;
-    xTimerStop(timer, 0);
-
-    if (delay_ms == cardboy::sdk::IEventBus::kWaitForever)
-        return;
-
-    if (delay_ms == 0) {
-        signal(cardboy::sdk::to_event_bits(cardboy::sdk::EventBusSignal::Timer));
-        return;
-    }
-
-    const TickType_t ticks = std::max<TickType_t>(pdMS_TO_TICKS(delay_ms), 1);
-    if (xTimerChangePeriod(timer, ticks, 0) == pdPASS)
-        xTimerStart(timer, 0);
-}
-
-void EventBus::cancelTimerSignal() {
-    if (!timer)
-        return;
-    xTimerStop(timer, 0);
-}
-
-} // namespace cardboy::backend::esp

Firmware/main/src/app_main.cpp

@@ -2,8 +2,10 @@
 
 #include "cardboy/apps/clock_app.hpp"
 #include "cardboy/apps/gameboy_app.hpp"
+#include "cardboy/apps/lockscreen_app.hpp"
 #include "cardboy/apps/menu_app.hpp"
 #include "cardboy/apps/settings_app.hpp"
+#include "cardboy/apps/snake_app.hpp"
 #include "cardboy/apps/tetris_app.hpp"
 #include "cardboy/backend/esp_backend.hpp"
 #include "cardboy/sdk/app_system.hpp"
@@ -232,8 +234,10 @@ extern "C" void app_main() {
 #endif
 
     system.registerApp(apps::createMenuAppFactory());
+    system.registerApp(apps::createLockscreenAppFactory());
     system.registerApp(apps::createSettingsAppFactory());
     system.registerApp(apps::createClockAppFactory());
+    system.registerApp(apps::createSnakeAppFactory());
     system.registerApp(apps::createTetrisAppFactory());
     system.registerApp(apps::createGameboyAppFactory());
 

Firmware/sdk/CMakeLists.txt

@@ -4,6 +4,11 @@ project(cardboy_sdk LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED YES)
 set(CMAKE_CXX_EXTENSIONS NO)
+#    add_compile_options(-Werror -O0 -Wall -Wextra -pedantic -Wno-unused-parameter -Wno-unused-variable
+#            -Wno-error=unused-function
+#            -Wshadow -Wformat=2 -Wfloat-equal -D_GLIBCXX_DEBUG -Wconversion)
+#add_compile_options(-fsanitize=address -fno-sanitize-recover -D_GLIBCXX_DEBUG)
+#add_link_options(-fsanitize=address -fno-sanitize-recover -D_GLIBCXX_DEBUG)
 
 add_subdirectory(utils)
 

Firmware/sdk/apps/CMakeLists.txt

@@ -13,7 +13,9 @@ target_link_libraries(cardboy_apps
 target_compile_features(cardboy_apps PUBLIC cxx_std_20)
 
 add_subdirectory(menu)
+add_subdirectory(lockscreen)
 add_subdirectory(clock)
 add_subdirectory(settings)
 add_subdirectory(gameboy)
+add_subdirectory(snake)
 add_subdirectory(tetris)

Firmware/sdk/apps/clock/src/clock_app.cpp

@@ -17,7 +17,10 @@ namespace apps {
 
 namespace {
 
+using cardboy::sdk::AppButtonEvent;
+using cardboy::sdk::AppTimeoutEvent;
 using cardboy::sdk::AppContext;
+using cardboy::sdk::AppTimerEvent;
 
 constexpr const char* kClockAppName = "Clock";
 
@@ -47,21 +50,20 @@ public:
         const auto snap = captureTime();
         renderIfNeeded(snap);
         lastSnapshot = snap;
-        refreshTimer = context.scheduleRepeatingTimer(200);
+        if (auto* timer = context.timer())
+            refreshTimer = timer->scheduleTimer(200, true);
     }
 
     void onStop() override { cancelRefreshTimer(); }
 
-    void handleEvent(const cardboy::sdk::AppEvent& event) override {
-        switch (event.type) {
-            case cardboy::sdk::AppEventType::Button:
-                handleButtonEvent(event.button);
-                break;
-            case cardboy::sdk::AppEventType::Timer:
-                if (event.timer.handle == refreshTimer)
-                    updateDisplay();
-                break;
-        }
+    std::optional<std::uint32_t> handleEvent(const cardboy::sdk::AppEvent& event) override {
+        event.visit(cardboy::sdk::overload([this](const AppButtonEvent& button) { handleButtonEvent(button); },
+                                           [this](const AppTimerEvent& timer) {
+                                               if (timer.handle == refreshTimer)
+                                                   updateDisplay();
+                                           },
+                                           [](const AppTimeoutEvent&) { /* ignore */ }));
+        return std::nullopt;
     }
 
 private:
@@ -76,10 +78,11 @@ private:
     TimeSnapshot lastSnapshot{};
 
     void cancelRefreshTimer() {
-        if (refreshTimer != cardboy::sdk::kInvalidAppTimer) {
-            context.cancelTimer(refreshTimer);
-            refreshTimer = cardboy::sdk::kInvalidAppTimer;
-        }
+        if (refreshTimer == cardboy::sdk::kInvalidAppTimer)
+            return;
+        if (auto* timer = context.timer())
+            timer->cancelTimer(refreshTimer);
+        refreshTimer = cardboy::sdk::kInvalidAppTimer;
     }
 
     void handleButtonEvent(const cardboy::sdk::AppButtonEvent& button) {

Firmware/sdk/apps/gameboy/src/gameboy_app.cpp

@@ -151,9 +151,11 @@ constexpr int kMenuSpacing = font16x8::kGlyphHeight + 6;
 class GameboyApp;
 
 
+using cardboy::sdk::AppButtonEvent;
 using cardboy::sdk::AppContext;
 using cardboy::sdk::AppEvent;
-using cardboy::sdk::AppEventType;
+using cardboy::sdk::AppTimeoutEvent;
+using cardboy::sdk::AppTimerEvent;
 using cardboy::sdk::AppTimerHandle;
 using cardboy::sdk::InputState;
 using cardboy::sdk::kInvalidAppTimer;
@@ -223,7 +225,6 @@ public:
         ::gAudioWriteThunk = &GameboyApp::audioWriteThunk;
         apu.attach(this);
         apu.reset();
-        cancelTick();
         frameDelayCarryUs = 0;
         GB_PERF_ONLY(perf.resetAll();)
         prevInput = context.input.readState();
@@ -232,13 +233,12 @@ public:
         scaleMode = ScaleMode::FullHeightWide;
         ensureFilesystemReady();
         refreshRomList();
-        mode         = Mode::Browse;
-        browserDirty = true;
-        scheduleNextTick(0);
+        mode          = Mode::Browse;
+        browserDirty  = true;
+        nextTimeoutMs = 0;
     }
 
     void onStop() override {
-        cancelTick();
         frameDelayCarryUs = 0;
         GB_PERF_ONLY(perf.maybePrintAggregate(true);)
         unloadRom();
@@ -251,21 +251,22 @@ public:
         }
     }
 
-    void handleEvent(const AppEvent& event) override {
-        if (event.type == AppEventType::Timer && event.timer.handle == tickTimer) {
-            tickTimer                   = kInvalidAppTimer;
-            const uint64_t frameStartUs = nowMicros();
-            performStep();
-            const uint64_t frameEndUs = nowMicros();
-            const uint64_t elapsedUs  = (frameEndUs >= frameStartUs) ? (frameEndUs - frameStartUs) : 0;
-            GB_PERF_ONLY(printf("Step took %" PRIu64 " us\n", elapsedUs));
-            scheduleAfterFrame(elapsedUs);
-            return;
-        }
-        if (event.type == AppEventType::Button) {
-            frameDelayCarryUs = 0;
-            scheduleNextTick(0);
-        }
+    std::optional<std::uint32_t> handleEvent(const AppEvent& event) override {
+        event.visit(cardboy::sdk::overload(
+                [this](const AppTimeoutEvent&) {
+                    const uint64_t frameStartUs = nowMicros();
+                    performStep();
+                    const uint64_t frameEndUs = nowMicros();
+                    const uint64_t elapsedUs  = (frameEndUs >= frameStartUs) ? (frameEndUs - frameStartUs) : 0;
+                    GB_PERF_ONLY(printf("Step took %" PRIu64 " us\n", elapsedUs));
+                    scheduleAfterFrame(elapsedUs);
+                },
+                [this](const AppButtonEvent&) {
+                    frameDelayCarryUs = 0;
+                    nextTimeoutMs     = 0;
+                },
+                [](const AppTimerEvent&) { /* ignore */ }));
+        return nextTimeoutMs;
     }
 
     void performStep() {
@@ -299,6 +300,9 @@ public:
                     break;
                 }
 
+                if (mode != Mode::Running)
+                    break;
+
 
                 GB_PERF_ONLY(perf.geometryUs = 0;)
 
@@ -306,11 +310,49 @@ public:
                 gb_run_frame(&gb);
                 GB_PERF_ONLY(perf.runUs = nowMicros() - runStartUs;)
 
+                {
+                    uint32_t freqHz = 0;
+                    uint8_t  loud   = 0;
+                    if (apu.computeEffectiveTone(freqHz, loud)) {
+                        // Basic smoothing: if freq didn't change much, keep it; otherwise snap quickly
+                        const uint32_t prev = lastFreqHz;
+                        if (prev != 0 && freqHz != 0) {
+                            const uint32_t diff = (prev > freqHz) ? (prev - freqHz) : (freqHz - prev);
+                            if (diff < 15) {
+                                freqHz = prev; // minor jitter suppression
+                                ++stableFrames;
+                            } else {
+                                stableFrames = 0;
+                            }
+                        } else {
+                            stableFrames = 0;
+                        }
+                        lastFreqHz           = freqHz;
+                        lastLoud             = loud;
+                        const uint32_t durMs = 16;
+                        playTone(freqHz, durMs, 0);
+                    } else {
+                        lastFreqHz = 0;
+                        lastLoud   = 0;
+                        // Don't enqueue anything; queue naturally drains and buzzer stops
+                    }
+                }
+
                 GB_PERF_ONLY(const uint64_t renderStartUs = nowMicros();)
                 renderGameFrame();
                 GB_PERF_ONLY(perf.renderUs = nowMicros() - renderStartUs;)
                 break;
             }
+            case Mode::Prompt: {
+                GB_PERF_ONLY(const uint64_t handleStartUs = nowMicros();)
+                handlePromptInput(input);
+                GB_PERF_ONLY(perf.handleUs = nowMicros() - handleStartUs;)
+
+                GB_PERF_ONLY(const uint64_t renderStartUs = nowMicros();)
+                renderPrompt();
+                GB_PERF_ONLY(perf.renderUs = nowMicros() - renderStartUs;)
+                break;
+            }
         }
 
         prevInput = input;
@@ -777,8 +819,9 @@ public:
         }
     };
 
-    enum class Mode { Browse, Running };
+    enum class Mode { Browse, Running, Prompt };
     enum class ScaleMode { Original, FullHeight, FullHeightWide };
+    enum class PromptKind { None, LoadState, SaveState };
 
     struct PerfTracker {
         enum class CallbackKind { RomRead, CartRamRead, CartRamWrite, LcdDraw, Error };
@@ -905,8 +948,19 @@ public:
 
         void printStep(Mode stepMode, bool gbReady, bool frameDirty, uint32_t fps, const std::string& romName,
                        std::size_t romCount, std::size_t selectedIdx, bool browserDirty) const {
-            auto              toMs    = [](uint64_t us) { return static_cast<double>(us) / 1000.0; };
-            const char*       modeStr = (stepMode == Mode::Running) ? "RUN" : "BROWSE";
+            auto        toMs    = [](uint64_t us) { return static_cast<double>(us) / 1000.0; };
+            const char* modeStr = "UNKNOWN";
+            switch (stepMode) {
+                case Mode::Running:
+                    modeStr = "RUN";
+                    break;
+                case Mode::Browse:
+                    modeStr = "BROWSE";
+                    break;
+                case Mode::Prompt:
+                    modeStr = "PROMPT";
+                    break;
+            }
             const char*       name    = romName.empty() ? "-" : romName.c_str();
             const std::size_t safeIdx = (romCount == 0) ? 0 : std::min(selectedIdx, romCount - 1);
             std::printf(
@@ -1059,9 +1113,9 @@ public:
     cardboy::sdk::IFilesystem*   filesystem   = nullptr;
     cardboy::sdk::IHighResClock* highResClock = nullptr;
     PerfTracker                  perf{};
-    AppTimerHandle               tickTimer         = kInvalidAppTimer;
     int64_t                      frameDelayCarryUs = 0;
-    static constexpr uint32_t    kTargetFrameUs    = 1000000 / 60; // ~16.6 ms
+    std::optional<std::uint32_t> nextTimeoutMs;
+    static constexpr uint32_t    kTargetFrameUs = 1000000 / 60; // ~16.6 ms
 
     Mode                  mode      = Mode::Browse;
     ScaleMode             scaleMode = ScaleMode::FullHeightWide;
@@ -1085,24 +1139,16 @@ public:
     uint32_t             fpsCurrent        = 0;
     std::string          activeRomName;
     std::string          activeRomSavePath;
+    std::string          activeRomStatePath;
+    PromptKind           promptKind      = PromptKind::None;
+    int                  promptSelection = 0; // 0 = Yes, 1 = No
+    bool                 promptDirty     = false;
     SimpleApu            apu{};
     // Smoothing state for buzzer tone
     uint32_t lastFreqHz   = 0;
     uint8_t  lastLoud     = 0;
     uint32_t stableFrames = 0;
 
-    void cancelTick() {
-        if (tickTimer != kInvalidAppTimer) {
-            context.cancelTimer(tickTimer);
-            tickTimer = kInvalidAppTimer;
-        }
-    }
-
-    void scheduleNextTick(uint32_t delayMs) {
-        cancelTick();
-        tickTimer = context.scheduleTimer(delayMs, false);
-    }
-
     uint32_t idleDelayMs() const { return browserDirty ? 50 : 140; }
 
     void scheduleAfterFrame(uint64_t elapsedUs) {
@@ -1111,17 +1157,17 @@ public:
             desiredUs += frameDelayCarryUs;
             if (desiredUs <= 0) {
                 frameDelayCarryUs = desiredUs;
-                scheduleNextTick(0);
+                nextTimeoutMs     = 0;
                 return;
             }
             frameDelayCarryUs = desiredUs % 1000;
             desiredUs -= frameDelayCarryUs;
             uint32_t delayMs = static_cast<uint32_t>(desiredUs / 1000);
-            scheduleNextTick(delayMs);
+            nextTimeoutMs    = delayMs;
             return;
         }
         frameDelayCarryUs = 0;
-        scheduleNextTick(idleDelayMs());
+        nextTimeoutMs     = idleDelayMs();
     }
 
     bool ensureFilesystemReady() {
@@ -1423,21 +1469,25 @@ public:
             return false;
         }
 
-        gb.direct.priv   = this;
-        gb.direct.joypad = 0xFF;
-
         gb_init_lcd(&gb, &GameboyApp::lcdDrawLine);
+        applyRuntimeBindings();
 
+        gb.direct.joypad     = 0xFF;
         gb.direct.interlace  = false;
         gb.direct.frame_skip = true;
 
         const uint_fast32_t saveSize = gb_get_save_size(&gb);
         cartRam.assign(static_cast<std::size_t>(saveSize), 0);
         std::string savePath;
+        std::string statePath;
         const bool  fsReady = (filesystem && filesystem->isMounted()) || ensureFilesystemReady();
-        if (fsReady)
-            savePath = buildSavePath(rom, romDirectory());
-        activeRomSavePath = savePath;
+        if (fsReady) {
+            const std::string romDir = romDirectory();
+            savePath                 = buildSavePath(rom, romDir);
+            statePath                = buildStatePath(rom, romDir);
+        }
+        activeRomSavePath  = savePath;
+        activeRomStatePath = statePath;
         loadSaveFile();
 
         resetFpsStats();
@@ -1452,6 +1502,10 @@ public:
         if (!fsReady)
             statusText.append(" (no save)");
         setStatus(std::move(statusText));
+
+        if (stateFileExists())
+            enterPrompt(PromptKind::LoadState);
+
         return true;
     }
 
@@ -1464,6 +1518,10 @@ public:
             cartRam.clear();
             activeRomName.clear();
             activeRomSavePath.clear();
+            activeRomStatePath.clear();
+            promptKind      = PromptKind::None;
+            promptSelection = 0;
+            promptDirty     = false;
             return;
         }
 
@@ -1477,6 +1535,10 @@ public:
         cartRam.clear();
         activeRomName.clear();
         activeRomSavePath.clear();
+        activeRomStatePath.clear();
+        promptKind      = PromptKind::None;
+        promptSelection = 0;
+        promptDirty     = false;
         std::memset(&gb, 0, sizeof(gb));
         apu.reset();
         mode         = Mode::Browse;
@@ -1491,6 +1553,19 @@ public:
         if (scaleToggleCombo)
             toggleScaleMode();
 
+        const bool exitComboPressed     = input.start && input.select;
+        const bool exitComboJustPressed = exitComboPressed && !(prevInput.start && prevInput.select);
+        if (exitComboJustPressed) {
+            if (!activeRomStatePath.empty()) {
+                enterPrompt(PromptKind::SaveState);
+            } else {
+                unloadRom();
+                setStatus("Save state unavailable");
+            }
+            gb.direct.joypad = 0xFF;
+            return;
+        }
+
         uint8_t joypad = 0xFF;
         if (input.a)
             joypad &= ~JOYPAD_A;
@@ -1510,13 +1585,6 @@ public:
             joypad &= ~JOYPAD_RIGHT;
 
         gb.direct.joypad = joypad;
-
-        const bool exitComboPressed     = input.start && input.select;
-        const bool exitComboJustPressed = exitComboPressed && !(prevInput.start && prevInput.select);
-        if (exitComboJustPressed) {
-            setStatus("Saved " + activeRomName);
-            unloadRom();
-        }
     }
 
     void renderGameFrame() {
@@ -1688,6 +1756,186 @@ public:
         }
     }
 
+    void applyRuntimeBindings() {
+        gb.gb_cart_ram_read      = &GameboyApp::cartRamRead;
+        gb.gb_cart_ram_write     = &GameboyApp::cartRamWrite;
+        gb.gb_error              = &GameboyApp::errorCallback;
+        gb.display.lcd_draw_line = &GameboyApp::lcdDrawLine;
+        gb.direct.priv           = this;
+        if (romDataView)
+            gb.direct.rom = romDataView;
+    }
+
+    bool saveStateToFile() {
+        if (activeRomStatePath.empty())
+            return false;
+
+        FILE* file = std::fopen(activeRomStatePath.c_str(), "wb");
+        if (!file)
+            return false;
+
+        const size_t written = std::fwrite(&gb, 1, sizeof(gb), file);
+        std::fclose(file);
+        return written == sizeof(gb);
+    }
+
+    bool loadStateFromFile() {
+        if (activeRomStatePath.empty())
+            return false;
+
+        FILE* file = std::fopen(activeRomStatePath.c_str(), "rb");
+        if (!file)
+            return false;
+
+        std::vector<uint8_t> backup(sizeof(gb));
+        std::memcpy(backup.data(), &gb, sizeof(gb));
+
+        const size_t read = std::fread(&gb, 1, sizeof(gb), file);
+        std::fclose(file);
+        if (read != sizeof(gb)) {
+            std::memcpy(&gb, backup.data(), sizeof(gb));
+            return false;
+        }
+
+        applyRuntimeBindings();
+        gb.direct.joypad = 0xFF;
+        frameDirty       = true;
+        return true;
+    }
+
+    bool stateFileExists() const {
+        if (activeRomStatePath.empty())
+            return false;
+        struct stat st{};
+        return stat(activeRomStatePath.c_str(), &st) == 0 && S_ISREG(st.st_mode);
+    }
+
+    void enterPrompt(PromptKind kind) {
+        if (kind == PromptKind::None)
+            return;
+        promptKind       = kind;
+        promptSelection  = 0;
+        promptDirty      = true;
+        mode             = Mode::Prompt;
+        gb.direct.joypad = 0xFF;
+        // scheduleNextTick(0);
+    }
+
+    void exitPrompt(Mode nextMode) {
+        promptKind      = PromptKind::None;
+        promptSelection = 0;
+        promptDirty     = true;
+        mode            = nextMode;
+    }
+
+    void handlePromptInput(const InputState& input) {
+        if (promptKind == PromptKind::None)
+            return;
+
+        const bool leftOrUp    = (input.left && !prevInput.left) || (input.up && !prevInput.up);
+        const bool rightOrDown = (input.right && !prevInput.right) || (input.down && !prevInput.down);
+        if (leftOrUp && promptSelection != 0) {
+            promptSelection = 0;
+            promptDirty     = true;
+        } else if (rightOrDown && promptSelection != 1) {
+            promptSelection = 1;
+            promptDirty     = true;
+        }
+
+        const bool confirm = (input.a && !prevInput.a) || (input.start && !prevInput.start);
+        const bool cancel  = (input.b && !prevInput.b) || (input.select && !prevInput.select);
+
+        if (confirm) {
+            handlePromptDecision(promptSelection == 0);
+        } else if (cancel) {
+            handlePromptDecision(false);
+        }
+    }
+
+    void handlePromptDecision(bool yesSelected) {
+        const PromptKind kind = promptKind;
+        if (kind == PromptKind::None)
+            return;
+
+        if (kind == PromptKind::LoadState) {
+            exitPrompt(Mode::Running);
+            if (yesSelected) {
+                if (loadStateFromFile())
+                    setStatus("Save state loaded");
+                else
+                    setStatus("Load state failed");
+            }
+            frameDirty = true;
+            return;
+        }
+
+        if (kind == PromptKind::SaveState) {
+            const bool haveStatePath = !activeRomStatePath.empty();
+            bool       saved         = false;
+            if (yesSelected && haveStatePath)
+                saved = saveStateToFile();
+
+            exitPrompt(Mode::Running);
+            unloadRom();
+
+            if (yesSelected) {
+                if (!haveStatePath)
+                    setStatus("Save state unavailable");
+                else if (saved)
+                    setStatus("Save state written");
+                else
+                    setStatus("Save state failed");
+            } else {
+                setStatus("Exited without state");
+            }
+        }
+    }
+
+    void renderPrompt() {
+        if (!promptDirty || promptKind == PromptKind::None)
+            return;
+        promptDirty = false;
+
+        framebuffer.frameReady();
+        framebuffer.clear(false);
+
+        auto drawCentered = [&](int y, std::string_view text, int scale = 1) {
+            const int width = font16x8::measureText(text, scale, 1);
+            const int x     = (framebuffer.width() - width) / 2;
+            font16x8::drawText(framebuffer, x, y, text, scale, true, 1);
+        };
+
+        std::string_view headline;
+        std::string_view helper;
+
+        switch (promptKind) {
+            case PromptKind::LoadState:
+                headline = "LOAD SAVE STATE?";
+                helper   = "A YES / B NO";
+                break;
+            case PromptKind::SaveState:
+                headline = "SAVE BEFORE EXIT?";
+                helper   = "A YES / B NO";
+                break;
+            case PromptKind::None:
+            default:
+                headline = "";
+                helper   = "";
+                break;
+        }
+
+        drawCentered(40, headline);
+        drawCentered(72, helper);
+
+        const std::string yesLabel = (promptSelection == 0) ? "> YES" : "  YES";
+        const std::string noLabel  = (promptSelection == 1) ? "> NO" : "  NO";
+
+        drawCentered(104, yesLabel);
+        drawCentered(120, noLabel);
+
+        framebuffer.sendFrame();
+    }
+
     void playTone(uint32_t freqHz, uint32_t durationMs, uint32_t gapMs) {
         if (freqHz == 0 || durationMs == 0)
             return;
@@ -1739,6 +1987,21 @@ public:
         return result;
     }
 
+    static std::string buildStatePath(const RomEntry& rom, std::string_view romDir) {
+        std::string slug = rom.saveSlug;
+        if (slug.empty())
+            slug = sanitizeSaveSlug(rom.name);
+        if (slug.empty())
+            slug = "rom";
+
+        std::string result(romDir);
+        if (!result.empty() && result.back() != '/')
+            result.push_back('/');
+        result.append(slug);
+        result.append(".state");
+        return result;
+    }
+
     static GameboyApp* fromGb(struct gb_s* gb) {
         CARDBOY_CHECK_CODE(if (!gb) return nullptr;);
         return static_cast<GameboyApp*>(gb->direct.priv);
@@ -1926,35 +2189,6 @@ private:
                 drawLineOriginal(*self, pixels, static_cast<int>(line));
                 break;
         }
-
-        // Simple per-scanline hook: at end of last line, decide tone for the frame.
-        if (line + 1 == LCD_HEIGHT) {
-            uint32_t freqHz = 0;
-            uint8_t  loud   = 0;
-            if (self->apu.computeEffectiveTone(freqHz, loud)) {
-                // Basic smoothing: if freq didn't change much, keep it; otherwise snap quickly
-                const uint32_t prev = self->lastFreqHz;
-                if (prev != 0 && freqHz != 0) {
-                    const uint32_t diff = (prev > freqHz) ? (prev - freqHz) : (freqHz - prev);
-                    if (diff < 15) {
-                        freqHz = prev; // minor jitter suppression
-                        ++self->stableFrames;
-                    } else {
-                        self->stableFrames = 0;
-                    }
-                } else {
-                    self->stableFrames = 0;
-                }
-                self->lastFreqHz     = freqHz;
-                self->lastLoud       = loud;
-                const uint32_t durMs = 17;
-                self->playTone(freqHz, durMs, 0);
-            } else {
-                self->lastFreqHz = 0;
-                self->lastLoud   = 0;
-                // Don't enqueue anything; queue naturally drains and buzzer stops
-            }
-        }
     }
 
     static const char* initErrorToString(enum gb_init_error_e err) {

Firmware/sdk/apps/lockscreen/CMakeLists.txt

@@ -0,0 +1,10 @@
+target_sources(cardboy_apps
+        PRIVATE
+        ${CMAKE_CURRENT_SOURCE_DIR}/src/lockscreen_app.cpp
+)
+
+target_include_directories(cardboy_apps
+        PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}/include
+)
+

Firmware/sdk/apps/lockscreen/include/cardboy/apps/lockscreen_app.hpp

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "cardboy/sdk/app_framework.hpp"
+
+#include <memory>
+#include <string_view>
+
+namespace apps {
+
+inline constexpr char            kLockscreenAppName[]    = "Lockscreen";
+inline constexpr std::string_view kLockscreenAppNameView = kLockscreenAppName;
+
+std::unique_ptr<cardboy::sdk::IAppFactory> createLockscreenAppFactory();
+
+} // namespace apps
+

Firmware/sdk/apps/lockscreen/src/lockscreen_app.cpp

@@ -0,0 +1,608 @@
+#include "cardboy/apps/lockscreen_app.hpp"
+
+#include "cardboy/apps/menu_app.hpp"
+#include "cardboy/gfx/font16x8.hpp"
+#include "cardboy/sdk/app_framework.hpp"
+#include "cardboy/sdk/app_system.hpp"
+
+#include <algorithm>
+#include <array>
+#include <cmath>
+#include <cstdio>
+#include <ctime>
+#include <string>
+#include <string_view>
+#include <vector>
+
+namespace apps {
+
+namespace {
+
+using cardboy::sdk::AppButtonEvent;
+using cardboy::sdk::AppContext;
+using cardboy::sdk::AppTimeoutEvent;
+using cardboy::sdk::AppTimerEvent;
+
+constexpr std::uint32_t kRefreshIntervalMs = 100;
+constexpr std::uint32_t kSlowRefreshMs     = 1000;
+constexpr std::uint32_t kFastRefreshMs     = 20;
+constexpr std::uint32_t kUnlockHoldMs      = 1500;
+
+using Framebuffer = typename AppContext::Framebuffer;
+using Clock       = typename AppContext::Clock;
+
+constexpr std::array<std::uint8_t, font16x8::kGlyphHeight> kArrowUpGlyph{
+        0b00010000, 0b00111000, 0b01111100, 0b11111110, 0b00010000, 0b00010000, 0b00010000, 0b00010000,
+        0b00010000, 0b00010000, 0b00010000, 0b00010000, 0b00010000, 0b00010000, 0b00000000, 0b00000000};
+
+constexpr std::array<std::uint8_t, font16x8::kGlyphHeight> kArrowDownGlyph{
+        0b00000000, 0b00000000, 0b00010000, 0b00010000, 0b00010000, 0b00010000, 0b00010000, 0b00010000,
+        0b00010000, 0b00010000, 0b00010000, 0b11111110, 0b01111100, 0b00111000, 0b00010000, 0b00000000};
+
+struct TimeSnapshot {
+    bool          hasWallTime   = false;
+    int           hour24        = 0;
+    int           minute        = 0;
+    int           second        = 0;
+    int           year          = 0;
+    int           month         = 0;
+    int           day           = 0;
+    int           weekday       = 0;
+    std::uint64_t uptimeSeconds = 0;
+};
+
+class LockscreenApp final : public cardboy::sdk::IApp {
+public:
+    explicit LockscreenApp(AppContext& ctx) :
+        context(ctx), framebuffer(ctx.framebuffer), clock(ctx.clock), notificationCenter(ctx.notificationCenter()) {}
+
+    void onStart() override {
+        cancelRefreshTimer();
+        lastSnapshot                  = {};
+        holdActive                    = false;
+        holdProgressMs                = 0;
+        dirty                         = true;
+        lastNotificationInteractionMs = clock.millis();
+        lastRefreshMs                 = clock.millis();
+        refreshNotifications();
+        const auto snap = captureTime();
+        renderIfNeeded(snap);
+        lastSnapshot = snap;
+        rescheduleRefreshTimer(kSlowRefreshMs);
+    }
+
+    void onStop() override { cancelRefreshTimer(); }
+
+    std::optional<std::uint32_t> handleEvent(const cardboy::sdk::AppEvent& event) override {
+        event.visit(cardboy::sdk::overload([this](const AppButtonEvent& button) { handleButtonEvent(button); },
+                                           [this](const AppTimerEvent& timer) {
+                                               if (timer.handle == refreshTimer) {
+                                                   const std::uint32_t now     = clock.millis();
+                                                   const std::uint32_t elapsed = now - lastRefreshMs;
+                                                   lastRefreshMs               = now;
+                                                   advanceHoldProgress(elapsed);
+                                                   updateDisplay();
+                                               }
+                                           },
+                                           [](const AppTimeoutEvent&) { /* ignore */ }));
+        return std::nullopt;
+    }
+
+private:
+    static constexpr std::size_t                                 kMaxDisplayedNotifications = 5;
+    static constexpr std::uint32_t                               kNotificationHideMs        = 8000;
+    AppContext&                                                  context;
+    Framebuffer&                                                 framebuffer;
+    Clock&                                                       clock;
+    cardboy::sdk::INotificationCenter*                           notificationCenter       = nullptr;
+    std::uint32_t                                                lastNotificationRevision = 0;
+    std::vector<cardboy::sdk::INotificationCenter::Notification> notifications;
+    std::size_t                                                  selectedNotification = 0;
+
+    bool                         dirty        = false;
+    cardboy::sdk::AppTimerHandle refreshTimer = cardboy::sdk::kInvalidAppTimer;
+    TimeSnapshot                 lastSnapshot{};
+    bool                         holdActive                    = false;
+    std::uint32_t                holdProgressMs                = 0;
+    std::uint32_t                lastNotificationInteractionMs = 0;
+    std::uint32_t                lastRefreshMs                 = 0;
+
+    void cancelRefreshTimer() {
+        if (refreshTimer == cardboy::sdk::kInvalidAppTimer)
+            return;
+        if (auto* timer = context.timer())
+            timer->cancelTimer(refreshTimer);
+        refreshTimer = cardboy::sdk::kInvalidAppTimer;
+    }
+
+    void rescheduleRefreshTimer(std::uint32_t intervalMs) {
+        cancelRefreshTimer();
+        if (auto* timer = context.timer())
+            refreshTimer = timer->scheduleTimer(intervalMs, true);
+    }
+
+    static bool comboPressed(const cardboy::sdk::InputState& state) { return state.a && state.select; }
+
+    void handleButtonEvent(const cardboy::sdk::AppButtonEvent& button) {
+        const bool upPressed   = button.current.up && !button.previous.up;
+        const bool downPressed = button.current.down && !button.previous.down;
+        bool       navPressed  = false;
+
+        if (!notifications.empty() && (upPressed || downPressed)) {
+            const std::size_t count       = notifications.size();
+            lastNotificationInteractionMs = clock.millis();
+            if (count > 1) {
+                if (upPressed && selectedNotification > 0) {
+                    selectedNotification--;
+                    navPressed = true;
+                } else if (downPressed && selectedNotification < count - 1) {
+                    selectedNotification++;
+                    navPressed = true;
+                }
+            }
+        }
+
+        const bool deletePressed = button.current.b && !button.previous.b;
+        if (deletePressed && notificationCenter && !notifications.empty()) {
+            const std::size_t index          = std::min<std::size_t>(selectedNotification, notifications.size() - 1);
+            const auto&       note           = notifications[index];
+            std::size_t       preferredIndex = index;
+            if (index + 1 < notifications.size())
+                preferredIndex = index + 1;
+            else if (index > 0)
+                preferredIndex = index - 1;
+            if (note.externalId != 0)
+                notificationCenter->removeByExternalId(note.externalId);
+            else
+                notificationCenter->removeById(note.id);
+            selectedNotification          = preferredIndex;
+            lastNotificationInteractionMs = clock.millis();
+            dirty                         = true;
+            refreshNotifications();
+        }
+
+        const bool comboNow = comboPressed(button.current);
+        updateHoldState(comboNow);
+        if (navPressed)
+            dirty = true;
+        updateDisplay();
+    }
+
+    void refreshNotifications() {
+        if (!notificationCenter) {
+            if (!notifications.empty() || lastNotificationRevision != 0) {
+                notifications.clear();
+                selectedNotification     = 0;
+                lastNotificationRevision = 0;
+                dirty                    = true;
+            }
+            return;
+        }
+        const std::uint32_t revision = notificationCenter->revision();
+        if (revision == lastNotificationRevision)
+            return;
+        lastNotificationRevision = revision;
+
+        const std::uint64_t previousId =
+                (selectedNotification < notifications.size()) ? notifications[selectedNotification].id : 0;
+
+        auto latest   = notificationCenter->recent(kMaxDisplayedNotifications);
+        notifications = std::move(latest);
+
+        if (notifications.empty()) {
+            selectedNotification = 0;
+        } else if (previousId != 0) {
+            auto it = std::find_if(notifications.begin(), notifications.end(),
+                                   [previousId](const auto& note) { return note.id == previousId; });
+            if (it != notifications.end()) {
+                selectedNotification = static_cast<std::size_t>(std::distance(notifications.begin(), it));
+            } else {
+                selectedNotification = 0;
+            }
+        } else {
+            selectedNotification = 0;
+        }
+
+        lastNotificationInteractionMs = clock.millis();
+        dirty                         = true;
+    }
+
+    void updateHoldState(bool comboNow) {
+        const bool wasActive = holdActive;
+        if (comboNow) {
+            if (!holdActive) {
+                holdActive     = true;
+                holdProgressMs = 0;
+                lastRefreshMs  = clock.millis();
+                dirty          = true;
+            }
+        } else {
+            if (holdActive || holdProgressMs != 0) {
+                holdActive     = false;
+                holdProgressMs = 0;
+                dirty          = true;
+            }
+        }
+        if (wasActive != holdActive) {
+            rescheduleRefreshTimer(holdActive ? kFastRefreshMs : kSlowRefreshMs);
+        }
+    }
+
+    void advanceHoldProgress(std::uint32_t elapsedMs) {
+        if (holdActive) {
+            const std::uint32_t next = std::min<std::uint32_t>(holdProgressMs + elapsedMs, kUnlockHoldMs);
+            if (next != holdProgressMs) {
+                holdProgressMs = next;
+                dirty          = true;
+            }
+            if (holdProgressMs >= kUnlockHoldMs) {
+                holdActive = false;
+                context.requestAppSwitchByName(kMenuAppName);
+            }
+        } else if (holdProgressMs != 0) {
+            holdProgressMs = 0;
+            dirty          = true;
+        }
+    }
+
+    void updateDisplay() {
+        refreshNotifications();
+        const auto snap = captureTime();
+        if (!sameSnapshot(snap, lastSnapshot))
+            dirty = true;
+        renderIfNeeded(snap);
+        lastSnapshot = snap;
+    }
+
+    static bool sameSnapshot(const TimeSnapshot& a, const TimeSnapshot& b) {
+        return a.hasWallTime == b.hasWallTime && a.hour24 == b.hour24 && a.minute == b.minute && a.second == b.second &&
+               a.day == b.day && a.month == b.month && a.year == b.year;
+    }
+
+    TimeSnapshot captureTime() const {
+        TimeSnapshot snap{};
+        snap.uptimeSeconds = clock.millis() / 1000ULL;
+
+        std::time_t raw = 0;
+        if (std::time(&raw) != static_cast<std::time_t>(-1) && raw > 0) {
+            std::tm tm{};
+            if (localtime_r(&raw, &tm) != nullptr) {
+                snap.hasWallTime = true;
+                snap.hour24      = tm.tm_hour;
+                snap.minute      = tm.tm_min;
+                snap.second      = tm.tm_sec;
+                snap.year        = tm.tm_year + 1900;
+                snap.month       = tm.tm_mon + 1;
+                snap.day         = tm.tm_mday;
+                snap.weekday     = tm.tm_wday;
+                return snap;
+            }
+        }
+
+        snap.hasWallTime = false;
+        snap.hour24      = static_cast<int>((snap.uptimeSeconds / 3600ULL) % 24ULL);
+        snap.minute      = static_cast<int>((snap.uptimeSeconds / 60ULL) % 60ULL);
+        snap.second      = static_cast<int>(snap.uptimeSeconds % 60ULL);
+        return snap;
+    }
+
+    static void drawCenteredText(Framebuffer& fb, int y, std::string_view text, int scale, int letterSpacing = 0) {
+        const int width = font16x8::measureText(text, scale, letterSpacing);
+        const int x     = (fb.width() - width) / 2;
+        font16x8::drawText(fb, x, y, text, scale, true, letterSpacing);
+    }
+
+    static void drawRectOutline(Framebuffer& fb, int x, int y, int w, int h) {
+        if (w <= 0 || h <= 0)
+            return;
+        for (int dx = 0; dx < w; ++dx) {
+            fb.drawPixel(x + dx, y, true);
+            fb.drawPixel(x + dx, y + h - 1, true);
+        }
+        for (int dy = 0; dy < h; ++dy) {
+            fb.drawPixel(x, y + dy, true);
+            fb.drawPixel(x + w - 1, y + dy, true);
+        }
+    }
+
+    static void fillRect(Framebuffer& fb, int x, int y, int w, int h) {
+        if (w <= 0 || h <= 0)
+            return;
+        for (int dy = 0; dy < h; ++dy) {
+            for (int dx = 0; dx < w; ++dx) {
+                fb.drawPixel(x + dx, y + dy, true);
+            }
+        }
+    }
+
+    static void drawArrowGlyph(Framebuffer& fb, int x, int y,
+                               const std::array<std::uint8_t, font16x8::kGlyphHeight>& glyph, int scale = 1) {
+        if (scale <= 0)
+            return;
+        for (int row = 0; row < font16x8::kGlyphHeight; ++row) {
+            const std::uint8_t rowBits = glyph[row];
+            for (int col = 0; col < font16x8::kGlyphWidth; ++col) {
+                const auto mask = static_cast<std::uint8_t>(1u << (font16x8::kGlyphWidth - 1 - col));
+                if ((rowBits & mask) == 0)
+                    continue;
+                for (int sx = 0; sx < scale; ++sx) {
+                    for (int sy = 0; sy < scale; ++sy) {
+                        fb.drawPixel(x + col * scale + sx, y + row * scale + sy, true);
+                    }
+                }
+            }
+        }
+    }
+
+    static void drawArrow(Framebuffer& fb, int x, int y, bool up, int scale = 1) {
+        const auto& glyph = up ? kArrowUpGlyph : kArrowDownGlyph;
+        drawArrowGlyph(fb, x, y, glyph, scale);
+    }
+
+    static std::string truncateWithEllipsis(std::string_view text, int maxWidth, int scale, int letterSpacing) {
+        if (font16x8::measureText(text, scale, letterSpacing) <= maxWidth)
+            return std::string(text);
+
+        std::string       result(text.begin(), text.end());
+        const std::string ellipsis = "...";
+        while (!result.empty()) {
+            result.pop_back();
+            std::string candidate = result + ellipsis;
+            if (font16x8::measureText(candidate, scale, letterSpacing) <= maxWidth)
+                return candidate;
+        }
+        return ellipsis;
+    }
+
+    static std::vector<std::string> wrapText(std::string_view text, int maxWidth, int scale, int letterSpacing,
+                                             int maxLines) {
+        std::vector<std::string> lines;
+        if (text.empty() || maxWidth <= 0 || maxLines <= 0)
+            return lines;
+
+        std::string current;
+        std::string word;
+        bool        truncated = false;
+
+        auto flushCurrent = [&]() {
+            if (current.empty())
+                return;
+            if (lines.size() < static_cast<std::size_t>(maxLines)) {
+                lines.push_back(current);
+            } else {
+                truncated = true;
+            }
+            current.clear();
+        };
+
+        for (std::size_t i = 0; i <= text.size(); ++i) {
+            char       ch      = (i < text.size()) ? text[i] : ' ';
+            const bool isBreak = (ch == ' ' || ch == '\n' || ch == '\r' || i == text.size());
+            if (!isBreak) {
+                word.push_back(ch);
+                continue;
+            }
+
+            if (!word.empty()) {
+                std::string candidate = current.empty() ? word : current + " " + word;
+                if (!current.empty() && font16x8::measureText(candidate, scale, letterSpacing) > maxWidth) {
+                    flushCurrent();
+                    if (lines.size() >= static_cast<std::size_t>(maxLines)) {
+                        truncated = true;
+                        break;
+                    }
+                    candidate = word;
+                }
+
+                if (font16x8::measureText(candidate, scale, letterSpacing) > maxWidth) {
+                    std::string shortened = truncateWithEllipsis(word, maxWidth, scale, letterSpacing);
+                    flushCurrent();
+                    if (lines.size() < static_cast<std::size_t>(maxLines)) {
+                        lines.push_back(shortened);
+                    } else {
+                        truncated = true;
+                        break;
+                    }
+                    current.clear();
+                } else {
+                    current = candidate;
+                }
+                word.clear();
+            }
+
+            if (ch == '\n' || ch == '\r') {
+                flushCurrent();
+                if (lines.size() >= static_cast<std::size_t>(maxLines)) {
+                    truncated = true;
+                    break;
+                }
+            }
+        }
+
+        flushCurrent();
+        if (lines.size() > static_cast<std::size_t>(maxLines)) {
+            truncated = true;
+            lines.resize(maxLines);
+        }
+        if (truncated && !lines.empty()) {
+            lines.back() = truncateWithEllipsis(lines.back(), maxWidth, scale, letterSpacing);
+        }
+        return lines;
+    }
+
+    static std::string formatDate(const TimeSnapshot& snap) {
+        static const char* kWeekdays[] = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
+        if (!snap.hasWallTime)
+            return "UPTIME MODE";
+        const char* weekday = (snap.weekday >= 0 && snap.weekday < 7) ? kWeekdays[snap.weekday] : "";
+        char        buffer[32];
+        std::snprintf(buffer, sizeof(buffer), "%s %04d-%02d-%02d", weekday, snap.year, snap.month, snap.day);
+        return buffer;
+    }
+
+    void renderIfNeeded(const TimeSnapshot& snap) {
+        if (!dirty)
+            return;
+        dirty = false;
+
+        framebuffer.frameReady();
+
+        const std::uint32_t nowMs            = clock.millis();
+        const bool          hasNotifications = !notifications.empty();
+        const bool          showNotificationDetails =
+                hasNotifications && (nowMs - lastNotificationInteractionMs <= kNotificationHideMs);
+
+        if (!showNotificationDetails) {
+            if (auto* battery = context.battery(); battery && battery->hasData()) {
+                const float percentage = battery->percentage();
+                if (std::isfinite(percentage) && percentage >= 0.0f) {
+                    char pct[8];
+                    std::snprintf(pct, sizeof(pct), "%.0f%%", static_cast<double>(percentage));
+                    const int pctWidth = font16x8::measureText(pct, 1, 1);
+                    const int pctX     = framebuffer.width() - pctWidth - 4;
+                    const int pctY     = 4;
+                    font16x8::drawText(framebuffer, pctX, pctY, pct, 1, true, 1);
+                }
+            }
+        }
+
+        const int scaleTime      = 4;
+        const int scaleSeconds   = 2;
+        const int scaleSmall     = 1;
+        const int textLineHeight = font16x8::kGlyphHeight * scaleSmall;
+
+        const int cardMarginTop   = 4;
+        const int cardMarginSide  = 8;
+        const int cardPadding     = 6;
+        const int cardLineSpacing = 4;
+        int       cardHeight      = 0;
+        const int cardWidth       = framebuffer.width() - cardMarginSide * 2;
+
+
+        if (hasNotifications) {
+            const auto& note = notifications[selectedNotification];
+            if (showNotificationDetails) {
+                std::string title = note.title.empty() ? std::string("Notification") : note.title;
+                title             = truncateWithEllipsis(title, cardWidth - cardPadding * 2, scaleSmall, 1);
+
+                auto bodyLines = wrapText(note.body, cardWidth - cardPadding * 2, scaleSmall, 1, 4);
+
+                cardHeight = cardPadding * 2 + textLineHeight;
+                if (!bodyLines.empty()) {
+                    cardHeight += cardLineSpacing;
+                    cardHeight += static_cast<int>(bodyLines.size()) * textLineHeight;
+                    if (bodyLines.size() > 1)
+                        cardHeight += (static_cast<int>(bodyLines.size()) - 1) * cardLineSpacing;
+                }
+
+                if (notifications.size() > 1) {
+                    cardHeight = std::max(cardHeight, cardPadding * 2 + textLineHeight * 2 + cardLineSpacing + 8);
+                }
+
+                drawRectOutline(framebuffer, cardMarginSide, cardMarginTop, cardWidth, cardHeight);
+                if (cardWidth > 2 && cardHeight > 2)
+                    drawRectOutline(framebuffer, cardMarginSide + 1, cardMarginTop + 1, cardWidth - 2, cardHeight - 2);
+
+                font16x8::drawText(framebuffer, cardMarginSide + cardPadding, cardMarginTop + cardPadding, title,
+                                   scaleSmall, true, 1);
+
+                if (notifications.size() > 1) {
+                    char counter[16];
+                    std::snprintf(counter, sizeof(counter), "%zu/%zu", selectedNotification + 1, notifications.size());
+                    const int counterWidth = font16x8::measureText(counter, scaleSmall, 1);
+                    const int counterX     = cardMarginSide + cardWidth - cardPadding - counterWidth;
+                    font16x8::drawText(framebuffer, counterX, cardMarginTop + cardPadding, counter, scaleSmall, true,
+                                       1);
+                    const int arrowWidth      = font16x8::kGlyphWidth * scaleSmall;
+                    const int arrowSpacing    = std::max(1, scaleSmall);
+                    const int arrowsTotalWide = arrowWidth * 2 + arrowSpacing;
+                    const int arrowX          = counterX + (counterWidth - arrowsTotalWide) / 2;
+                    const int arrowY          = cardMarginTop + cardPadding + textLineHeight + 1;
+                    if (selectedNotification > 0)
+                        drawArrow(framebuffer, arrowX, arrowY, true, scaleSmall);
+                    if (selectedNotification < notifications.size() - 1)
+                        drawArrow(framebuffer, arrowX + arrowWidth + arrowSpacing, arrowY, false, scaleSmall);
+                    const int arrowHeight = font16x8::kGlyphHeight * scaleSmall;
+                    cardHeight            = std::max(cardHeight, arrowY + arrowHeight - cardMarginTop);
+                }
+
+                if (!bodyLines.empty()) {
+                    int bodyY = cardMarginTop + cardPadding + textLineHeight + cardLineSpacing;
+                    for (const auto& line: bodyLines) {
+                        font16x8::drawText(framebuffer, cardMarginSide + cardPadding, bodyY, line, scaleSmall, true, 1);
+                        bodyY += textLineHeight + cardLineSpacing;
+                    }
+                }
+            } else {
+                cardHeight = textLineHeight + cardPadding * 2;
+                char summary[32];
+                if (notifications.size() == 1)
+                    std::snprintf(summary, sizeof(summary), "1 NOTIFICATION");
+                else
+                    std::snprintf(summary, sizeof(summary), "%zu NOTIFICATIONS", notifications.size());
+                const int summaryWidth = font16x8::measureText(summary, scaleSmall, 1);
+                const int summaryX     = (framebuffer.width() - summaryWidth) / 2;
+                const int summaryY     = cardMarginTop;
+                font16x8::drawText(framebuffer, summaryX, summaryY, summary, scaleSmall, true, 1);
+            }
+        }
+
+        const int defaultTimeY = (framebuffer.height() - font16x8::kGlyphHeight * scaleTime) / 2 - 8;
+        const int minTimeY     = (cardHeight > 0) ? (cardMarginTop + cardHeight + 12) : 16;
+        const int maxTimeY     = std::max(minTimeY, framebuffer.height() - font16x8::kGlyphHeight * scaleTime - 48);
+        const int timeY        = std::clamp(defaultTimeY, minTimeY, maxTimeY);
+
+        char hoursMinutes[6];
+        std::snprintf(hoursMinutes, sizeof(hoursMinutes), "%02d:%02d", snap.hour24, snap.minute);
+        const int mainW = font16x8::measureText(hoursMinutes, scaleTime, 0);
+        const int timeX = (framebuffer.width() - mainW) / 2;
+        const int secX  = timeX + mainW + 12;
+        const int secY  = timeY + font16x8::kGlyphHeight * scaleTime - font16x8::kGlyphHeight * scaleSeconds;
+        char      secs[3];
+        std::snprintf(secs, sizeof(secs), "%02d", snap.second);
+
+        font16x8::drawText(framebuffer, timeX, timeY, hoursMinutes, scaleTime, true, 0);
+        font16x8::drawText(framebuffer, secX, secY, secs, scaleSeconds, true, 0);
+
+        const std::string dateLine = formatDate(snap);
+        drawCenteredText(framebuffer, timeY + font16x8::kGlyphHeight * scaleTime + 16, dateLine, scaleSmall, 1);
+
+        const std::string instruction      = "HOLD A+SELECT TO UNLOCK";
+        const int         instructionWidth = font16x8::measureText(instruction, scaleSmall, 1);
+        const int         barHeight        = 18;
+        const int         barY             = framebuffer.height() - 30;
+        const int         textY            = barY + (barHeight - textLineHeight) / 2 + 1;
+        drawCenteredText(framebuffer, textY, instruction, scaleSmall, 1);
+
+        const int barWidth = framebuffer.width() - 64;
+        const int barX     = 32;
+
+        if (holdActive || holdProgressMs > 0) {
+            drawRectOutline(framebuffer, barX, barY, barWidth, barHeight);
+            const int   innerWidth  = barWidth - 2;
+            const int   innerHeight = barHeight - 2;
+            const float ratio       = std::clamp(holdProgressMs / static_cast<float>(kUnlockHoldMs), 0.0f, 1.0f);
+            const int   fillWidth   = static_cast<int>(ratio * innerWidth + 0.5f);
+            if (fillWidth > 0)
+                fillRect(framebuffer, barX + 1, barY + 1, fillWidth, innerHeight);
+        }
+
+        framebuffer.sendFrame();
+    }
+};
+
+class LockscreenAppFactory final : public cardboy::sdk::IAppFactory {
+public:
+    const char*                         name() const override { return kLockscreenAppName; }
+    std::unique_ptr<cardboy::sdk::IApp> create(cardboy::sdk::AppContext& context) override {
+        return std::make_unique<LockscreenApp>(context);
+    }
+};
+
+} // namespace
+
+std::unique_ptr<cardboy::sdk::IAppFactory> createLockscreenAppFactory() {
+    return std::make_unique<LockscreenAppFactory>();
+}
+
+} // namespace apps

Firmware/sdk/apps/menu/src/menu_app.cpp

@@ -1,4 +1,5 @@
 #include "cardboy/apps/menu_app.hpp"
+#include "cardboy/apps/lockscreen_app.hpp"
 
 #include "cardboy/sdk/app_framework.hpp"
 #include "cardboy/sdk/app_system.hpp"
@@ -6,6 +7,7 @@
 #include "cardboy/gfx/font16x8.hpp"
 
 #include <algorithm>
+#include <cstdint>
 #include <cstdlib>
 #include <string>
 #include <string_view>
@@ -15,10 +17,16 @@ namespace apps {
 
 namespace {
 
+using cardboy::sdk::AppButtonEvent;
+using cardboy::sdk::AppTimeoutEvent;
 using cardboy::sdk::AppContext;
+using cardboy::sdk::AppEvent;
+using cardboy::sdk::AppTimerEvent;
 
 using Framebuffer = typename AppContext::Framebuffer;
 
+constexpr std::uint32_t kIdleTimeoutMs = 15000;
+
 struct MenuEntry {
     std::string name;
     std::size_t index = 0;
@@ -31,15 +39,44 @@ public:
     void onStart() override {
         refreshEntries();
         dirty = true;
+        resetInactivityTimer();
         renderIfNeeded();
     }
 
-    void handleEvent(const cardboy::sdk::AppEvent& event) override {
-        if (event.type != cardboy::sdk::AppEventType::Button)
-            return;
+    void onStop() override { cancelInactivityTimer(); }
 
-        const auto& current  = event.button.current;
-        const auto& previous = event.button.previous;
+    std::optional<std::uint32_t> handleEvent(const cardboy::sdk::AppEvent& event) override {
+        event.visit(cardboy::sdk::overload([this](const AppButtonEvent& button) { handleButtonEvent(button); },
+                                           [this](const AppTimerEvent& timer) {
+                                               if (timer.handle == inactivityTimer) {
+                                                   cancelInactivityTimer();
+                                                   context.requestAppSwitchByName(kLockscreenAppName);
+                                               }
+                                           },
+                                           [](const AppTimeoutEvent&) { /* ignore */ }));
+        return std::nullopt;
+    }
+
+private:
+    AppContext&            context;
+    Framebuffer&           framebuffer;
+    std::vector<MenuEntry> entries;
+    std::size_t            selected = 0;
+
+    bool dirty = false;
+
+    cardboy::sdk::AppTimerHandle inactivityTimer = cardboy::sdk::kInvalidAppTimer;
+
+    void handleButtonEvent(const cardboy::sdk::AppButtonEvent& button) {
+        resetInactivityTimer();
+
+        const auto& current  = button.current;
+        const auto& previous = button.previous;
+
+        if (current.b && !previous.b) {
+            context.requestAppSwitchByName(kLockscreenAppName);
+            return;
+        }
 
         if (current.left && !previous.left) {
             moveSelection(-1);
@@ -54,14 +91,6 @@ public:
         renderIfNeeded();
     }
 
-private:
-    AppContext&            context;
-    Framebuffer&           framebuffer;
-    std::vector<MenuEntry> entries;
-    std::size_t            selected = 0;
-
-    bool dirty = false;
-
     void moveSelection(int step) {
         if (entries.empty())
             return;
@@ -93,7 +122,8 @@ private:
             const char* name = factory->name();
             if (!name)
                 continue;
-            if (std::string_view(name) == kMenuAppNameView)
+            const std::string_view appName(name);
+            if (appName == kMenuAppNameView || appName == kLockscreenAppNameView)
                 continue;
             entries.push_back(MenuEntry{std::string(name), i});
         }
@@ -159,6 +189,20 @@ private:
 
         framebuffer.sendFrame();
     }
+
+    void cancelInactivityTimer() {
+        if (inactivityTimer == cardboy::sdk::kInvalidAppTimer)
+            return;
+        if (auto* timer = context.timer())
+            timer->cancelTimer(inactivityTimer);
+        inactivityTimer = cardboy::sdk::kInvalidAppTimer;
+    }
+
+    void resetInactivityTimer() {
+        cancelInactivityTimer();
+        if (auto* timer = context.timer())
+            inactivityTimer = timer->scheduleTimer(kIdleTimeoutMs, false);
+    }
 };
 
 class MenuAppFactory final : public cardboy::sdk::IAppFactory {

Firmware/sdk/apps/settings/src/settings_app.cpp

@@ -38,41 +38,44 @@ public:
         renderIfNeeded();
     }
 
-    void handleEvent(const cardboy::sdk::AppEvent& event) override {
-        if (event.type != cardboy::sdk::AppEventType::Button)
-            return;
+    std::optional<std::uint32_t> handleEvent(const cardboy::sdk::AppEvent& event) override {
+        event.visit(cardboy::sdk::overload(
+                [this](const cardboy::sdk::AppButtonEvent& button) {
+                    const auto& current  = button.current;
+                    const auto& previous = button.previous;
 
-        const auto& current  = event.button.current;
-        const auto& previous = event.button.previous;
+                    const bool previousAvailable = buzzerAvailable;
+                    syncBuzzerState();
+                    if (previousAvailable != buzzerAvailable)
+                        dirty = true;
 
-        const bool previousAvailable = buzzerAvailable;
-        syncBuzzerState();
-        if (previousAvailable != buzzerAvailable)
-            dirty = true;
+                    if (current.b && !previous.b) {
+                        context.requestAppSwitchByName(kMenuAppName);
+                        return;
+                    }
 
-        if (current.b && !previous.b) {
-            context.requestAppSwitchByName(kMenuAppName);
-            return;
-        }
+                    bool moved = false;
+                    if (current.down && !previous.down) {
+                        moveSelection(+1);
+                        moved = true;
+                    } else if (current.up && !previous.up) {
+                        moveSelection(-1);
+                        moved = true;
+                    }
 
-        bool moved = false;
-        if (current.down && !previous.down) {
-            moveSelection(+1);
-            moved = true;
-        } else if (current.up && !previous.up) {
-            moveSelection(-1);
-            moved = true;
-        }
+                    const bool togglePressed = (current.a && !previous.a) || (current.start && !previous.start) ||
+                                               (current.select && !previous.select);
+                    if (togglePressed)
+                        handleToggle();
 
-        const bool togglePressed = (current.a && !previous.a) || (current.start && !previous.start) ||
-                                   (current.select && !previous.select);
-        if (togglePressed)
-            handleToggle();
+                    if (moved)
+                        dirty = true;
 
-        if (moved)
-            dirty = true;
-
-        renderIfNeeded();
+                    renderIfNeeded();
+                },
+                [](const cardboy::sdk::AppTimerEvent&) { /* ignore */ },
+                [](const cardboy::sdk::AppTimeoutEvent&) { /* ignore */ }));
+        return std::nullopt;
     }
 
 private:

Firmware/sdk/apps/snake/CMakeLists.txt

@@ -0,0 +1,9 @@
+target_sources(cardboy_apps
+        PRIVATE
+        ${CMAKE_CURRENT_SOURCE_DIR}/src/snake_app.cpp
+)
+
+target_include_directories(cardboy_apps
+        PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}/include
+)

Firmware/sdk/apps/snake/include/cardboy/apps/snake_app.hpp

@@ -0,0 +1,11 @@
+#pragma once
+
+#include "cardboy/sdk/app_framework.hpp"
+
+#include <memory>
+
+namespace apps {
+
+std::unique_ptr<cardboy::sdk::IAppFactory> createSnakeAppFactory();
+
+} // namespace apps

Firmware/sdk/apps/snake/src/snake_app.cpp

@@ -0,0 +1,429 @@
+#include "cardboy/apps/snake_app.hpp"
+
+#include "cardboy/apps/menu_app.hpp"
+#include "cardboy/gfx/font16x8.hpp"
+#include "cardboy/sdk/app_framework.hpp"
+#include "cardboy/sdk/app_system.hpp"
+#include "cardboy/sdk/display_spec.hpp"
+#include "cardboy/sdk/input_state.hpp"
+
+#include <algorithm>
+#include <cstdint>
+#include <cstdlib>
+#include <deque>
+#include <random>
+#include <string>
+#include <string_view>
+#include <vector>
+
+namespace apps {
+namespace {
+
+using cardboy::sdk::AppButtonEvent;
+using cardboy::sdk::AppTimeoutEvent;
+using cardboy::sdk::AppContext;
+using cardboy::sdk::AppEvent;
+using cardboy::sdk::AppTimerEvent;
+using cardboy::sdk::AppTimerHandle;
+using cardboy::sdk::InputState;
+
+constexpr char kSnakeAppName[] = "Snake";
+
+constexpr int kBoardWidth                = 32;
+constexpr int kBoardHeight               = 18;
+constexpr int kCellSize                  = 10;
+constexpr int kInitialSnakeLength        = 5;
+constexpr int kScorePerFood              = 10;
+constexpr int kMinMoveIntervalMs         = 80;
+constexpr int kBaseMoveIntervalMs        = 220;
+constexpr int kIntervalSpeedupPerSegment = 4;
+
+struct Point {
+    int x = 0;
+    int y = 0;
+
+    bool operator==(const Point& other) const { return x == other.x && y == other.y; }
+};
+
+enum class Direction { Up, Down, Left, Right };
+
+[[nodiscard]] std::uint32_t randomSeed(AppContext& ctx) {
+    if (auto* rnd = ctx.random())
+        return rnd->nextUint32();
+    static std::random_device rd;
+    return rd();
+}
+
+class SnakeGame {
+public:
+    explicit SnakeGame(AppContext& ctx) : context(ctx), framebuffer(ctx.framebuffer) {
+        rng.seed(randomSeed(context));
+        loadHighScore();
+        reset();
+    }
+
+    void onStart() {
+        scheduleMoveTimer();
+        dirty = true;
+        renderIfNeeded();
+    }
+
+    void onStop() { cancelMoveTimer(); }
+
+    std::optional<std::uint32_t> handleEvent(const AppEvent& event) {
+        event.visit(cardboy::sdk::overload([this](const AppButtonEvent& button) { handleButtons(button); },
+                                           [this](const AppTimerEvent& timer) { handleTimer(timer.handle); },
+                                           [](const AppTimeoutEvent&) { /* ignore */ }));
+        renderIfNeeded();
+        return std::nullopt;
+    }
+
+private:
+    AppContext&                       context;
+    typename AppContext::Framebuffer& framebuffer;
+
+    std::deque<Point> snake;
+    Point             food{};
+    Direction         direction       = Direction::Right;
+    Direction         queuedDirection = Direction::Right;
+    bool              paused          = false;
+    bool              gameOver        = false;
+    bool              dirty           = false;
+    int               score           = 0;
+    int               highScore       = 0;
+    AppTimerHandle    moveTimer       = cardboy::sdk::kInvalidAppTimer;
+    std::mt19937      rng;
+
+    void handleButtons(const AppButtonEvent& evt) {
+        const auto& cur  = evt.current;
+        const auto& prev = evt.previous;
+        if (cur.b && !prev.b) {
+            context.requestAppSwitchByName(kMenuAppName);
+            return;
+        }
+
+        if (cur.select && !prev.select) {
+            reset();
+            return;
+        }
+
+        if (cur.start && !prev.start) {
+            if (gameOver)
+                reset();
+            else {
+                paused = !paused;
+                dirty  = true;
+            }
+        }
+
+        if (gameOver)
+            return;
+
+        if (cur.up && !prev.up)
+            queueDirection(Direction::Up);
+        else if (cur.down && !prev.down)
+            queueDirection(Direction::Down);
+        else if (cur.left && !prev.left)
+            queueDirection(Direction::Left);
+        else if (cur.right && !prev.right)
+            queueDirection(Direction::Right);
+
+        if (cur.a && !prev.a && !paused)
+            advance();
+    }
+
+    void handleTimer(AppTimerHandle handle) {
+        if (handle == moveTimer && !paused && !gameOver)
+            advance();
+    }
+
+    void reset() {
+        cancelMoveTimer();
+
+        snake.clear();
+        const int centerX = kBoardWidth / 2;
+        const int centerY = kBoardHeight / 2;
+        for (int i = 0; i < kInitialSnakeLength; ++i)
+            snake.push_back(Point{centerX - i, centerY});
+
+        direction       = Direction::Right;
+        queuedDirection = Direction::Right;
+        paused          = false;
+        gameOver        = false;
+        score           = 0;
+        dirty           = true;
+
+        if (!spawnFood())
+            onGameOver();
+
+        scheduleMoveTimer();
+    }
+
+    void advance() {
+        direction      = queuedDirection;
+        Point nextHead = snake.front();
+        switch (direction) {
+            case Direction::Up:
+                --nextHead.y;
+                break;
+            case Direction::Down:
+                ++nextHead.y;
+                break;
+            case Direction::Left:
+                --nextHead.x;
+                break;
+            case Direction::Right:
+                ++nextHead.x;
+                break;
+        }
+
+        if (isCollision(nextHead)) {
+            onGameOver();
+            return;
+        }
+
+        snake.push_front(nextHead);
+        if (nextHead == food) {
+            score += kScorePerFood;
+            updateHighScore();
+            if (!spawnFood()) {
+                onGameOver();
+                return;
+            }
+            scheduleMoveTimer();
+            if (auto* buzzer = context.buzzer())
+                buzzer->beepMove();
+        } else {
+            snake.pop_back();
+        }
+
+        dirty = true;
+    }
+
+    [[nodiscard]] bool isCollision(const Point& nextHead) const {
+        if (nextHead.x < 0 || nextHead.x >= kBoardWidth || nextHead.y < 0 || nextHead.y >= kBoardHeight)
+            return true;
+        return std::find(snake.begin(), snake.end(), nextHead) != snake.end();
+    }
+
+    void onGameOver() {
+        if (gameOver)
+            return;
+        gameOver = true;
+        cancelMoveTimer();
+        dirty = true;
+        if (auto* buzzer = context.buzzer())
+            buzzer->beepGameOver();
+    }
+
+    void queueDirection(Direction next) {
+        if (isOpposite(direction, next) || isOpposite(queuedDirection, next))
+            return;
+        queuedDirection = next;
+    }
+
+    [[nodiscard]] static bool isOpposite(Direction a, Direction b) {
+        if ((a == Direction::Up && b == Direction::Down) || (a == Direction::Down && b == Direction::Up))
+            return true;
+        if ((a == Direction::Left && b == Direction::Right) || (a == Direction::Right && b == Direction::Left))
+            return true;
+        return false;
+    }
+
+    bool spawnFood() {
+        std::vector<Point> freeCells;
+        freeCells.reserve(kBoardWidth * kBoardHeight - static_cast<int>(snake.size()));
+        for (int y = 0; y < kBoardHeight; ++y) {
+            for (int x = 0; x < kBoardWidth; ++x) {
+                Point p{x, y};
+                if (std::find(snake.begin(), snake.end(), p) == snake.end())
+                    freeCells.push_back(p);
+            }
+        }
+        if (freeCells.empty())
+            return false;
+        std::uniform_int_distribution<std::size_t> dist(0, freeCells.size() - 1);
+        food = freeCells[dist(rng)];
+        return true;
+    }
+
+    void scheduleMoveTimer() {
+        cancelMoveTimer();
+        const std::uint32_t interval = currentInterval();
+        if (auto* timer = context.timer())
+            moveTimer = timer->scheduleTimer(interval, true);
+    }
+
+    void cancelMoveTimer() {
+        if (moveTimer == cardboy::sdk::kInvalidAppTimer)
+            return;
+        if (auto* timer = context.timer())
+            timer->cancelTimer(moveTimer);
+        moveTimer = cardboy::sdk::kInvalidAppTimer;
+    }
+
+    [[nodiscard]] std::uint32_t currentInterval() const {
+        int interval = kBaseMoveIntervalMs - static_cast<int>(snake.size()) * kIntervalSpeedupPerSegment;
+        if (interval < kMinMoveIntervalMs)
+            interval = kMinMoveIntervalMs;
+        return static_cast<std::uint32_t>(interval);
+    }
+
+    void updateHighScore() {
+        if (score <= highScore)
+            return;
+        highScore = score;
+        if (auto* storage = context.storage())
+            storage->writeUint32("snake", "best", static_cast<std::uint32_t>(highScore));
+    }
+
+    void loadHighScore() {
+        if (auto* storage = context.storage()) {
+            std::uint32_t stored = 0;
+            if (storage->readUint32("snake", "best", stored))
+                highScore = static_cast<int>(stored);
+        }
+    }
+
+    void renderIfNeeded() {
+        if (!dirty)
+            return;
+        dirty = false;
+
+        framebuffer.frameReady();
+        framebuffer.clear(false);
+
+        drawBoard();
+        drawFood();
+        drawSnake();
+        drawHud();
+
+        framebuffer.sendFrame();
+    }
+
+    [[nodiscard]] int boardOriginX() const { return (cardboy::sdk::kDisplayWidth - kBoardWidth * kCellSize) / 2; }
+
+    [[nodiscard]] int boardOriginY() const {
+        const int centered = (cardboy::sdk::kDisplayHeight - kBoardHeight * kCellSize) / 2;
+        return std::max(24, centered);
+    }
+
+    void drawBoard() {
+        const int originX = boardOriginX();
+        const int originY = boardOriginY();
+        const int width   = kBoardWidth * kCellSize;
+        const int height  = kBoardHeight * kCellSize;
+
+        const int x0 = originX;
+        const int y0 = originY;
+        const int x1 = originX + width - 1;
+        const int y1 = originY + height - 1;
+        for (int x = x0; x <= x1; ++x) {
+            framebuffer.drawPixel(x, y0, true);
+            framebuffer.drawPixel(x, y1, true);
+        }
+        for (int y = y0; y <= y1; ++y) {
+            framebuffer.drawPixel(x0, y, true);
+            framebuffer.drawPixel(x1, y, true);
+        }
+    }
+
+    void drawSnake() {
+        if (snake.empty())
+            return;
+        std::size_t index = 0;
+        for (const auto& segment: snake) {
+            drawSnakeSegment(segment, index == 0);
+            ++index;
+        }
+    }
+
+    void drawSnakeSegment(const Point& segment, bool head) {
+        const int originX = boardOriginX() + segment.x * kCellSize;
+        const int originY = boardOriginY() + segment.y * kCellSize;
+        for (int dy = 0; dy < kCellSize; ++dy) {
+            for (int dx = 0; dx < kCellSize; ++dx) {
+                const bool border = dx == 0 || dy == 0 || dx == kCellSize - 1 || dy == kCellSize - 1;
+                bool       fill   = ((dx + dy) & 0x1) == 0;
+                if (head)
+                    fill = true;
+                const bool on = border || fill;
+                framebuffer.drawPixel(originX + dx, originY + dy, on);
+            }
+        }
+    }
+
+    void drawFood() {
+        const int cx = boardOriginX() + food.x * kCellSize + kCellSize / 2;
+        const int cy = boardOriginY() + food.y * kCellSize + kCellSize / 2;
+        const int r  = std::max(2, kCellSize / 2 - 1);
+        for (int dy = -r; dy <= r; ++dy) {
+            for (int dx = -r; dx <= r; ++dx) {
+                if (std::abs(dx) + std::abs(dy) <= r)
+                    framebuffer.drawPixel(cx + dx, cy + dy, true);
+            }
+        }
+    }
+
+    void drawHud() {
+        const int         margin   = 12;
+        const int         textY    = 8;
+        const std::string scoreStr = "SCORE " + std::to_string(score);
+        const std::string bestStr  = "BEST " + std::to_string(highScore);
+        font16x8::drawText(framebuffer, margin, textY, scoreStr, 1, true, 1);
+        const int bestX = cardboy::sdk::kDisplayWidth - font16x8::measureText(bestStr, 1, 1) - margin;
+        font16x8::drawText(framebuffer, bestX, textY, bestStr, 1, true, 1);
+
+        const int         footerY   = cardboy::sdk::kDisplayHeight - 24;
+        const std::string menuStr   = "B MENU";
+        const std::string selectStr = "SELECT RESET";
+        const std::string startStr  = "START PAUSE";
+        const int         selectX   = (cardboy::sdk::kDisplayWidth - font16x8::measureText(selectStr, 1, 1)) / 2;
+        const int         startX    = cardboy::sdk::kDisplayWidth - font16x8::measureText(startStr, 1, 1) - margin;
+        font16x8::drawText(framebuffer, margin, footerY, menuStr, 1, true, 1);
+        font16x8::drawText(framebuffer, selectX, footerY, selectStr, 1, true, 1);
+        font16x8::drawText(framebuffer, startX, footerY, startStr, 1, true, 1);
+
+        if (paused && !gameOver)
+            drawBanner("PAUSED");
+        else if (gameOver)
+            drawBanner("GAME OVER");
+    }
+
+    void drawBanner(std::string_view text) {
+        const int w = font16x8::measureText(text, 2, 1);
+        const int h = font16x8::kGlyphHeight * 2;
+        const int x = (cardboy::sdk::kDisplayWidth - w) / 2;
+        const int y = boardOriginY() + kBoardHeight * kCellSize / 2 - h / 2;
+        for (int yy = -4; yy < h + 4; ++yy)
+            for (int xx = -6; xx < w + 6; ++xx)
+                framebuffer.drawPixel(x + xx, y + yy, yy == -4 || yy == h + 3 || xx == -6 || xx == w + 5);
+        font16x8::drawText(framebuffer, x, y, text, 2, true, 1);
+    }
+};
+
+class SnakeApp final : public cardboy::sdk::IApp {
+public:
+    explicit SnakeApp(AppContext& ctx) : game(ctx) {}
+
+    void                         onStart() override { game.onStart(); }
+    void                         onStop() override { game.onStop(); }
+    std::optional<std::uint32_t> handleEvent(const AppEvent& event) override { return game.handleEvent(event); }
+
+private:
+    SnakeGame game;
+};
+
+class SnakeFactory final : public cardboy::sdk::IAppFactory {
+public:
+    const char*                         name() const override { return kSnakeAppName; }
+    std::unique_ptr<cardboy::sdk::IApp> create(AppContext& context) override {
+        return std::make_unique<SnakeApp>(context);
+    }
+};
+
+} // namespace
+
+std::unique_ptr<cardboy::sdk::IAppFactory> createSnakeAppFactory() { return std::make_unique<SnakeFactory>(); }
+
+} // namespace apps

Firmware/sdk/apps/tetris/src/tetris_app.cpp

@@ -22,7 +22,7 @@ namespace {
 using cardboy::sdk::AppButtonEvent;
 using cardboy::sdk::AppContext;
 using cardboy::sdk::AppEvent;
-using cardboy::sdk::AppEventType;
+using cardboy::sdk::AppTimerEvent;
 using cardboy::sdk::AppTimerHandle;
 using cardboy::sdk::InputState;
 
@@ -148,16 +148,12 @@ public:
 
     void onStop() { cancelTimers(); }
 
-    void handleEvent(const AppEvent& event) {
-        switch (event.type) {
-            case AppEventType::Button:
-                handleButtons(event.button);
-                break;
-            case AppEventType::Timer:
-                handleTimer(event.timer.handle);
-                break;
-        }
+    std::optional<std::uint32_t> handleEvent(const AppEvent& event) {
+        event.visit(cardboy::sdk::overload([this](const AppButtonEvent& button) { handleButtons(button); },
+                                           [this](const AppTimerEvent& timer) { handleTimer(timer.handle); },
+                                           [](const cardboy::sdk::AppTimeoutEvent&) { /* ignore */ }));
         renderIfNeeded();
+        return std::nullopt;
     }
 
 private:
@@ -240,35 +236,40 @@ private:
 
     void cancelTimers() {
         if (dropTimer != cardboy::sdk::kInvalidAppTimer) {
-            context.cancelTimer(dropTimer);
+            if (auto* timer = context.timer())
+                timer->cancelTimer(dropTimer);
             dropTimer = cardboy::sdk::kInvalidAppTimer;
         }
         cancelSoftDropTimer();
     }
 
     void cancelSoftDropTimer() {
-        if (softTimer != cardboy::sdk::kInvalidAppTimer) {
-            context.cancelTimer(softTimer);
-            softTimer = cardboy::sdk::kInvalidAppTimer;
-        }
+        if (softTimer == cardboy::sdk::kInvalidAppTimer)
+            return;
+        if (auto* timer = context.timer())
+            timer->cancelTimer(softTimer);
+        softTimer = cardboy::sdk::kInvalidAppTimer;
     }
 
     void scheduleDropTimer() {
         cancelDropTimer();
         const std::uint32_t interval = dropIntervalMs();
-        dropTimer                    = context.scheduleRepeatingTimer(interval);
+        if (auto* timer = context.timer())
+            dropTimer = timer->scheduleTimer(interval, true);
     }
 
     void cancelDropTimer() {
-        if (dropTimer != cardboy::sdk::kInvalidAppTimer) {
-            context.cancelTimer(dropTimer);
-            dropTimer = cardboy::sdk::kInvalidAppTimer;
-        }
+        if (dropTimer == cardboy::sdk::kInvalidAppTimer)
+            return;
+        if (auto* timer = context.timer())
+            timer->cancelTimer(dropTimer);
+        dropTimer = cardboy::sdk::kInvalidAppTimer;
     }
 
     void scheduleSoftDropTimer() {
         cancelSoftDropTimer();
-        softTimer = context.scheduleRepeatingTimer(60);
+        if (auto* timer = context.timer())
+            softTimer = timer->scheduleTimer(60, true);
     }
 
     [[nodiscard]] std::uint32_t dropIntervalMs() const {
@@ -634,9 +635,9 @@ class TetrisApp final : public cardboy::sdk::IApp {
 public:
     explicit TetrisApp(AppContext& ctx) : game(ctx) {}
 
-    void onStart() override { game.onStart(); }
-    void onStop() override { game.onStop(); }
-    void handleEvent(const AppEvent& event) override { game.handleEvent(event); }
+    void                         onStart() override { game.onStart(); }
+    void                         onStop() override { game.onStop(); }
+    std::optional<std::uint32_t> handleEvent(const AppEvent& event) override { return game.handleEvent(event); }
 
 private:
     TetrisGame game;

Firmware/sdk/backend_interface/CMakeLists.txt

@@ -16,7 +16,6 @@ target_sources(cardboy_backend_interface
         ${CMAKE_CURRENT_SOURCE_DIR}/include/cardboy/backend/backend_interface.hpp
         ${CMAKE_CURRENT_SOURCE_DIR}/include/cardboy/sdk/backend.hpp
         ${CMAKE_CURRENT_SOURCE_DIR}/include/cardboy/sdk/display_spec.hpp
-        ${CMAKE_CURRENT_SOURCE_DIR}/include/cardboy/sdk/event_bus.hpp
         ${CMAKE_CURRENT_SOURCE_DIR}/include/cardboy/sdk/loop_hooks.hpp
         ${CMAKE_CURRENT_SOURCE_DIR}/include/cardboy/sdk/input_state.hpp
         ${CMAKE_CURRENT_SOURCE_DIR}/include/cardboy/sdk/platform.hpp

Firmware/sdk/backend_interface/include/cardboy/sdk/app_events.hpp

@@ -0,0 +1,71 @@
+#pragma once
+
+#include "cardboy/sdk/input_state.hpp"
+
+#include <cstdint>
+#include <type_traits>
+#include <utility>
+#include <variant>
+
+namespace cardboy::sdk {
+
+using AppTimerHandle                      = std::uint32_t;
+constexpr AppTimerHandle kInvalidAppTimer = 0;
+
+struct AppButtonEvent {
+    InputState current{};
+    InputState previous{};
+};
+
+struct AppTimerEvent {
+    AppTimerHandle handle = kInvalidAppTimer;
+};
+
+struct AppTimeoutEvent {};
+
+struct AppEvent {
+    using Data = std::variant<AppButtonEvent, AppTimerEvent, AppTimeoutEvent>;
+
+    std::uint32_t timestamp_ms = 0;
+    Data          data{AppButtonEvent{}};
+
+    [[nodiscard]] bool isButton() const { return std::holds_alternative<AppButtonEvent>(data); }
+    [[nodiscard]] bool isTimer() const { return std::holds_alternative<AppTimerEvent>(data); }
+    [[nodiscard]] bool isTimeout() const { return std::holds_alternative<AppTimeoutEvent>(data); }
+
+    [[nodiscard]] const AppButtonEvent* button() const { return std::get_if<AppButtonEvent>(&data); }
+    [[nodiscard]] AppButtonEvent*       button() { return std::get_if<AppButtonEvent>(&data); }
+
+    [[nodiscard]] const AppTimerEvent* timer() const { return std::get_if<AppTimerEvent>(&data); }
+    [[nodiscard]] AppTimerEvent*       timer() { return std::get_if<AppTimerEvent>(&data); }
+
+    [[nodiscard]] const AppTimeoutEvent* timeout() const { return std::get_if<AppTimeoutEvent>(&data); }
+    [[nodiscard]] AppTimeoutEvent*       timeout() { return std::get_if<AppTimeoutEvent>(&data); }
+
+    template<typename Visitor>
+    decltype(auto) visit(Visitor&& visitor) {
+        return std::visit(std::forward<Visitor>(visitor), data);
+    }
+
+    template<typename Visitor>
+    decltype(auto) visit(Visitor&& visitor) const {
+        return std::visit(std::forward<Visitor>(visitor), data);
+    }
+};
+
+static_assert(std::is_trivially_copyable_v<AppEvent>);
+
+template<typename... Ts>
+struct Overload : Ts... {
+    using Ts::operator()...;
+};
+
+template<typename... Ts>
+Overload(Ts...) -> Overload<Ts...>;
+
+template<typename... Ts>
+constexpr auto overload(Ts&&... ts) {
+    return Overload<std::decay_t<Ts>...>{std::forward<Ts>(ts)...};
+}
+
+} // namespace cardboy::sdk

Firmware/sdk/backend_interface/include/cardboy/sdk/event_bus.hpp

@@ -1,42 +0,0 @@
-#pragma once
-
-#include <cstdint>
-
-namespace cardboy::sdk {
-
-enum class EventBusSignal : std::uint32_t {
-    None     = 0,
-    Input    = 1u << 0,
-    Timer    = 1u << 1,
-    External = 1u << 2,
-};
-
-inline EventBusSignal operator|(EventBusSignal lhs, EventBusSignal rhs) {
-    return static_cast<EventBusSignal>(static_cast<std::uint32_t>(lhs) | static_cast<std::uint32_t>(rhs));
-}
-
-inline EventBusSignal& operator|=(EventBusSignal& lhs, EventBusSignal rhs) {
-    lhs = lhs | rhs;
-    return lhs;
-}
-
-inline EventBusSignal operator&(EventBusSignal lhs, EventBusSignal rhs) {
-    return static_cast<EventBusSignal>(static_cast<std::uint32_t>(lhs) & static_cast<std::uint32_t>(rhs));
-}
-
-inline std::uint32_t to_event_bits(EventBusSignal signal) { return static_cast<std::uint32_t>(signal); }
-
-class IEventBus {
-public:
-    static constexpr std::uint32_t kWaitForever = 0xFFFFFFFFu;
-
-    virtual ~IEventBus() = default;
-
-    virtual void          signal(std::uint32_t bits)                         = 0;
-    virtual void          signalFromISR(std::uint32_t bits)                  = 0;
-    virtual std::uint32_t wait(std::uint32_t mask, std::uint32_t timeout_ms) = 0;
-    virtual void          scheduleTimerSignal(std::uint32_t delay_ms)        = 0;
-    virtual void          cancelTimerSignal()                                = 0;
-};
-
-} // namespace cardboy::sdk

Firmware/sdk/backend_interface/include/cardboy/sdk/framebuffer_hooks.hpp

@@ -11,8 +11,8 @@ public:
     static void invokePreSend(void* framebuffer);
 
 private:
-    static PreSendHook hook_;
-    static void*       userData_;
+    static PreSendHook _hook;
+    static void*       _userData;
 };
 
 } // namespace cardboy::sdk

Firmware/sdk/backend_interface/include/cardboy/sdk/input_state.hpp

@@ -11,6 +11,13 @@ struct InputState {
     bool b      = false;
     bool select = false;
     bool start  = false;
+
+    bool operator==(const InputState& other) const {
+        return up == other.up && left == other.left && right == other.right && down == other.down && a == other.a &&
+               b == other.b && select == other.select && start == other.start;
+    }
+
+    bool operator!=(const InputState& other) const { return !(*this == other); }
 };
 
 } // namespace cardboy::sdk

Firmware/sdk/backend_interface/include/cardboy/sdk/services.hpp

@@ -1,11 +1,14 @@
 #pragma once
 
-#include "cardboy/sdk/event_bus.hpp"
 #include "cardboy/sdk/loop_hooks.hpp"
+#include "cardboy/sdk/timer_service.hpp"
 
 #include <cstdint>
+#include <memory>
+#include <optional>
 #include <string>
 #include <string_view>
+#include <vector>
 
 namespace cardboy::sdk {
 
@@ -36,6 +39,7 @@ public:
     [[nodiscard]] virtual float voltage() const { return 0.0f; }
     [[nodiscard]] virtual float charge() const { return 0.0f; }
     [[nodiscard]] virtual float current() const { return 0.0f; }
+    [[nodiscard]] virtual float percentage() const { return 0.0f; }
 };
 
 class IStorage {
@@ -69,15 +73,59 @@ public:
     [[nodiscard]] virtual std::string basePath() const  = 0;
 };
 
+class INotificationCenter {
+public:
+    struct Notification {
+        std::uint64_t id         = 0;
+        std::uint64_t timestamp  = 0;
+        std::uint64_t externalId = 0;
+        std::string   title;
+        std::string   body;
+        bool          unread = true;
+    };
+
+    virtual ~INotificationCenter() = default;
+
+    virtual void                                    pushNotification(Notification notification)  = 0;
+    [[nodiscard]] virtual std::uint32_t             revision() const                             = 0;
+    [[nodiscard]] virtual std::vector<Notification> recent(std::size_t limit) const              = 0;
+    virtual void                                    markAllRead()                                = 0;
+    virtual void                                    clear()                                      = 0;
+    virtual void                                    removeById(std::uint64_t id)                 = 0;
+    virtual void                                    removeByExternalId(std::uint64_t externalId) = 0;
+};
+
+class IEventBus {
+public:
+    virtual ~IEventBus() = default;
+
+    virtual void                    post(const AppEvent& event)                                 = 0;
+    virtual std::optional<AppEvent> pop(std::optional<std::uint32_t> timeout_ms = std::nullopt) = 0;
+};
+
+struct AppScopedServices {
+    ITimerService* timer         = nullptr;
+    virtual ~AppScopedServices() = default;
+};
+
+class IAppServiceProvider {
+public:
+    virtual ~IAppServiceProvider() = default;
+
+    [[nodiscard]] virtual std::unique_ptr<AppScopedServices> createScopedServices(std::uint64_t generation) = 0;
+};
+
 struct Services {
-    IBuzzer*         buzzer       = nullptr;
-    IBatteryMonitor* battery      = nullptr;
-    IStorage*        storage      = nullptr;
-    IRandom*         random       = nullptr;
-    IHighResClock*   highResClock = nullptr;
-    IFilesystem*     filesystem   = nullptr;
-    IEventBus*       eventBus     = nullptr;
-    ILoopHooks*      loopHooks    = nullptr;
+    IBuzzer*             buzzer        = nullptr;
+    IBatteryMonitor*     battery       = nullptr;
+    IStorage*            storage       = nullptr;
+    IRandom*             random        = nullptr;
+    IHighResClock*       highResClock  = nullptr;
+    IFilesystem*         filesystem    = nullptr;
+    IEventBus*           eventBus      = nullptr;
+    ILoopHooks*          loopHooks     = nullptr;
+    INotificationCenter* notifications = nullptr;
+    IAppServiceProvider* appServices   = nullptr;
 };
 
 } // namespace cardboy::sdk

Firmware/sdk/backend_interface/include/cardboy/sdk/timer_service.hpp

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "cardboy/sdk/app_events.hpp"
+
+#include <cstdint>
+
+namespace cardboy::sdk {
+
+class ITimerService {
+public:
+    virtual ~ITimerService() = default;
+
+    virtual AppTimerHandle scheduleTimer(std::uint32_t delay_ms, bool repeat) = 0;
+    virtual void           cancelTimer(AppTimerHandle handle)                 = 0;
+    virtual void           cancelAllTimers()                                  = 0;
+};
+
+} // namespace cardboy::sdk

Firmware/sdk/backends/desktop/include/cardboy/backend/desktop_backend.hpp

@@ -1,6 +1,5 @@
 #pragma once
 
-#include "cardboy/sdk/event_bus.hpp"
 #include "cardboy/sdk/platform.hpp"
 #include "cardboy/sdk/services.hpp"
 
@@ -9,8 +8,10 @@
 #include <chrono>
 #include <condition_variable>
 #include <cstdint>
+#include <deque>
 #include <filesystem>
 #include <limits>
+#include <memory>
 #include <mutex>
 #include <random>
 #include <string>
@@ -39,165 +40,232 @@ public:
 class DesktopBattery final : public cardboy::sdk::IBatteryMonitor {
 public:
     [[nodiscard]] bool hasData() const override { return false; }
-};
 
-class DesktopStorage final : public cardboy::sdk::IStorage {
-public:
-    [[nodiscard]] bool readUint32(std::string_view ns, std::string_view key, std::uint32_t& out) override;
-    void               writeUint32(std::string_view ns, std::string_view key, std::uint32_t value) override;
+    class DesktopStorage final : public cardboy::sdk::IStorage {
+    public:
+        [[nodiscard]] bool readUint32(std::string_view ns, std::string_view key, std::uint32_t& out) override;
+        void               writeUint32(std::string_view ns, std::string_view key, std::uint32_t value) override;
 
-private:
-    std::unordered_map<std::string, std::uint32_t> data;
+    private:
+        std::unordered_map<std::string, std::uint32_t> data;
 
-    static std::string composeKey(std::string_view ns, std::string_view key);
-};
+        static std::string composeKey(std::string_view ns, std::string_view key);
+    };
 
-class DesktopRandom final : public cardboy::sdk::IRandom {
-public:
-    DesktopRandom();
+    class DesktopRandom final : public cardboy::sdk::IRandom {
+    public:
+        DesktopRandom();
 
-    [[nodiscard]] std::uint32_t nextUint32() override;
+        [[nodiscard]] std::uint32_t nextUint32() override;
 
-private:
-    std::mt19937                                 rng;
-    std::uniform_int_distribution<std::uint32_t> dist;
-};
+    private:
+        std::mt19937                                 rng;
+        std::uniform_int_distribution<std::uint32_t> dist;
+    };
 
-class DesktopHighResClock final : public cardboy::sdk::IHighResClock {
-public:
-    DesktopHighResClock();
+    class DesktopHighResClock final : public cardboy::sdk::IHighResClock {
+    public:
+        DesktopHighResClock();
 
-    [[nodiscard]] std::uint64_t micros() override;
+        [[nodiscard]] std::uint64_t micros() override;
 
-private:
-    const std::chrono::steady_clock::time_point start;
-};
+    private:
+        const std::chrono::steady_clock::time_point start;
+    };
 
-class DesktopFilesystem final : public cardboy::sdk::IFilesystem {
-public:
-    DesktopFilesystem();
+    class DesktopFilesystem final : public cardboy::sdk::IFilesystem {
+    public:
+        DesktopFilesystem();
 
-    bool                      mount() override;
-    [[nodiscard]] bool        isMounted() const override { return mounted; }
-    [[nodiscard]] std::string basePath() const override { return basePathPath.string(); }
+        bool                      mount() override;
+        [[nodiscard]] bool        isMounted() const override { return mounted; }
+        [[nodiscard]] std::string basePath() const override { return basePathPath.string(); }
 
-private:
-    std::filesystem::path basePathPath;
-    bool                  mounted = false;
-};
+    private:
+        std::filesystem::path basePathPath;
+        bool                  mounted = false;
+    };
 
-class DesktopEventBus final : public cardboy::sdk::IEventBus {
-public:
-    explicit DesktopEventBus(DesktopRuntime& owner);
-    ~DesktopEventBus() override;
+    class DesktopNotificationCenter final : public cardboy::sdk::INotificationCenter {
+    public:
+        void                                    pushNotification(Notification notification) override;
+        [[nodiscard]] std::uint32_t             revision() const override;
+        [[nodiscard]] std::vector<Notification> recent(std::size_t limit) const override;
+        void                                    markAllRead() override;
+        void                                    clear() override;
+        void                                    removeById(std::uint64_t id) override;
+        void                                    removeByExternalId(std::uint64_t externalId) override;
 
-    void          signal(std::uint32_t bits) override;
-    void          signalFromISR(std::uint32_t bits) override;
-    std::uint32_t wait(std::uint32_t mask, std::uint32_t timeout_ms) override;
-    void          scheduleTimerSignal(std::uint32_t delay_ms) override;
-    void          cancelTimerSignal() override;
+    private:
+        static constexpr std::size_t kMaxEntries = 8;
 
-private:
-    DesktopRuntime&         runtime;
-    std::mutex              mutex;
-    std::condition_variable cv;
-    std::uint32_t           pendingBits = 0;
+        mutable std::mutex        mutex;
+        std::vector<Notification> entries;
+        std::uint64_t             nextId          = 1;
+        std::uint32_t             revisionCounter = 0;
+    };
 
-    std::mutex              timerMutex;
-    std::condition_variable timerCv;
-    std::thread             timerThread;
-    bool                    timerCancel = false;
-};
+    class DesktopLoopHooks final : public cardboy::sdk::ILoopHooks {
+    public:
+        explicit DesktopLoopHooks(DesktopRuntime& owner);
 
-class DesktopFramebuffer final : public cardboy::sdk::FramebufferFacade<DesktopFramebuffer> {
-public:
-    explicit DesktopFramebuffer(DesktopRuntime& runtime);
+        void onLoopIteration() override;
 
-    [[nodiscard]] int  width_impl() const;
-    [[nodiscard]] int  height_impl() const;
-    void               drawPixel_impl(int x, int y, bool on);
-    void               clear_impl(bool on);
-    void               frameReady_impl();
-    void               sendFrame_impl(bool clearAfterSend);
-    [[nodiscard]] bool frameInFlight_impl() const { return false; }
+    private:
+        DesktopRuntime& runtime;
+    };
 
-private:
-    DesktopRuntime& runtime;
-};
+    class DesktopEventBus final : public cardboy::sdk::IEventBus {
+    public:
+        void                                  post(const cardboy::sdk::AppEvent& event) override;
+        std::optional<cardboy::sdk::AppEvent> pop(std::optional<std::uint32_t> timeout_ms = std::nullopt) override;
 
-class DesktopInput final : public cardboy::sdk::InputFacade<DesktopInput> {
-public:
-    explicit DesktopInput(DesktopRuntime& runtime);
+    private:
+        std::mutex                         mutex;
+        std::condition_variable            cv;
+        std::deque<cardboy::sdk::AppEvent> queue;
+    };
 
-    cardboy::sdk::InputState readState_impl();
-    void                     handleKey(sf::Keyboard::Key key, bool pressed);
+    class DesktopTimerService final : public cardboy::sdk::ITimerService {
+    public:
+        DesktopTimerService(DesktopRuntime& owner, cardboy::sdk::IEventBus& eventBus);
+        ~DesktopTimerService() override;
 
-private:
-    DesktopRuntime&          runtime;
-    cardboy::sdk::InputState state{};
-};
+        cardboy::sdk::AppTimerHandle scheduleTimer(std::uint32_t delay_ms, bool repeat) override;
+        void                         cancelTimer(cardboy::sdk::AppTimerHandle handle) override;
+        void                         cancelAllTimers() override;
 
-class DesktopClock final : public cardboy::sdk::ClockFacade<DesktopClock> {
-public:
-    explicit DesktopClock(DesktopRuntime& runtime);
+    private:
+        struct TimerRecord {
+            cardboy::sdk::AppTimerHandle          handle = cardboy::sdk::kInvalidAppTimer;
+            std::chrono::steady_clock::time_point due;
+            std::chrono::milliseconds             interval{0};
+            bool                                  repeat = false;
+            bool                                  active = true;
+        };
 
-    std::uint32_t millis_impl();
-    void          sleep_ms_impl(std::uint32_t ms);
+        void workerLoop();
+        void wakeWorker();
+        void cleanupInactive();
 
-private:
-    DesktopRuntime&                             runtime;
-    const std::chrono::steady_clock::time_point start;
-};
+        DesktopRuntime&              runtime;
+        cardboy::sdk::IEventBus&     eventBus;
+        std::mutex                   mutex;
+        std::condition_variable      cv;
+        std::vector<TimerRecord>     timers;
+        bool                         stopWorker = false;
+        std::thread                  worker;
+        cardboy::sdk::AppTimerHandle nextHandle = 1;
+    };
 
-class DesktopRuntime {
-public:
-    DesktopRuntime();
+    class DesktopAppServiceProvider final : public cardboy::sdk::IAppServiceProvider {
+    public:
+        DesktopAppServiceProvider(DesktopRuntime& owner, cardboy::sdk::IEventBus& bus);
 
-    cardboy::sdk::Services& serviceRegistry();
-    void                    processEvents();
-    void                    presentIfNeeded();
-    void                    sleepFor(std::uint32_t ms);
+        [[nodiscard]] std::unique_ptr<cardboy::sdk::AppScopedServices>
+        createScopedServices(std::uint64_t generation) override;
 
-    [[nodiscard]] bool isRunning() const { return running; }
+    private:
+        struct ScopedServices final : cardboy::sdk::AppScopedServices {
+            std::unique_ptr<DesktopTimerService> ownedTimer;
+        };
 
-    DesktopFramebuffer framebuffer;
-    DesktopInput       input;
-    DesktopClock       clock;
+        DesktopRuntime&          runtime;
+        cardboy::sdk::IEventBus& eventBus;
+    };
 
-private:
-    friend class DesktopFramebuffer;
-    friend class DesktopInput;
-    friend class DesktopClock;
+    class DesktopFramebuffer final : public cardboy::sdk::FramebufferFacade<DesktopFramebuffer> {
+    public:
+        explicit DesktopFramebuffer(DesktopRuntime& runtime);
 
-    void setPixel(int x, int y, bool on);
-    void clearPixels(bool on);
+        [[nodiscard]] int  width_impl() const;
+        [[nodiscard]] int  height_impl() const;
+        void               drawPixel_impl(int x, int y, bool on);
+        void               clear_impl(bool on);
+        void               frameReady_impl();
+        void               sendFrame_impl(bool clearAfterSend);
+        [[nodiscard]] bool frameInFlight_impl() const { return false; }
 
-    sf::RenderWindow          window;
-    sf::Texture               texture;
-    sf::Sprite                sprite;
-    std::vector<std::uint8_t> pixels;
-    bool                      dirty          = true;
-    bool                      running        = true;
-    bool                      clearNextFrame = true;
+    private:
+        DesktopRuntime& runtime;
+    };
 
-    DesktopBuzzer          buzzerService;
-    DesktopBattery         batteryService;
-    DesktopStorage         storageService;
-    DesktopRandom          randomService;
-    DesktopHighResClock    highResService;
-    DesktopFilesystem      filesystemService;
-    DesktopEventBus        eventBusService;
-    cardboy::sdk::Services services{};
-};
+    class DesktopInput final : public cardboy::sdk::InputFacade<DesktopInput> {
+    public:
+        explicit DesktopInput(DesktopRuntime& runtime);
 
-struct Backend {
-    using Framebuffer = DesktopFramebuffer;
-    using Input       = DesktopInput;
-    using Clock       = DesktopClock;
-};
+        cardboy::sdk::InputState readState_impl();
+        void                     handleKey(sf::Keyboard::Key key, bool pressed);
+
+    private:
+        DesktopRuntime&          runtime;
+        cardboy::sdk::InputState state{};
+    };
+
+    class DesktopClock final : public cardboy::sdk::ClockFacade<DesktopClock> {
+    public:
+        explicit DesktopClock(DesktopRuntime& runtime);
+
+        std::uint32_t millis_impl();
+        void          sleep_ms_impl(std::uint32_t ms);
+
+    private:
+        DesktopRuntime&                             runtime;
+        const std::chrono::steady_clock::time_point start;
+    };
+
+    class DesktopRuntime {
+    public:
+        DesktopRuntime();
+
+        cardboy::sdk::Services& serviceRegistry();
+        void                    processEvents();
+        void                    presentIfNeeded();
+        void                    sleepFor(std::uint32_t ms);
+
+        [[nodiscard]] bool isRunning() const { return running; }
+
+        DesktopFramebuffer framebuffer;
+        DesktopInput       input;
+        DesktopClock       clock;
+
+    private:
+        friend class DesktopFramebuffer;
+        friend class DesktopInput;
+        friend class DesktopClock;
+
+        void setPixel(int x, int y, bool on);
+        void clearPixels(bool on);
+
+        sf::RenderWindow          window;
+        sf::Texture               texture;
+        sf::Sprite                sprite;
+        std::vector<std::uint8_t> pixels;
+        bool                      dirty          = true;
+        bool                      running        = true;
+        bool                      clearNextFrame = true;
+
+        DesktopBuzzer             buzzerService;
+        DesktopBattery            batteryService;
+        DesktopStorage            storageService;
+        DesktopRandom             randomService;
+        DesktopHighResClock       highResService;
+        DesktopFilesystem         filesystemService;
+        DesktopEventBus           eventBusService;
+        DesktopAppServiceProvider appServiceProvider;
+        DesktopNotificationCenter notificationService;
+        DesktopLoopHooks          loopHooksService;
+        cardboy::sdk::Services    services{};
+    };
+
+    struct Backend {
+        using Framebuffer = DesktopFramebuffer;
+        using Input       = DesktopInput;
+        using Clock       = DesktopClock;
+    };
 
 } // namespace cardboy::backend::desktop
 
 namespace cardboy::backend {
-using DesktopBackend = desktop::Backend;
+    using DesktopBackend = desktop::Backend;
 } // namespace cardboy::backend

Firmware/sdk/backends/desktop/src/desktop_backend.cpp

@@ -8,95 +8,167 @@
 #include <algorithm>
 #include <chrono>
 #include <cstdlib>
+#include <ctime>
+#include <iostream>
 #include <stdexcept>
 #include <system_error>
+#include <utility>
 
 namespace cardboy::backend::desktop {
 
-DesktopEventBus::DesktopEventBus(DesktopRuntime& owner) : runtime(owner) {}
+namespace {
+constexpr std::size_t kDesktopEventQueueLimit = 64;
+} // namespace
 
-DesktopEventBus::~DesktopEventBus() { cancelTimerSignal(); }
+void DesktopEventBus::post(const cardboy::sdk::AppEvent& event) {
+    std::lock_guard<std::mutex> lock(mutex);
+    queue.push_back(event);
+    cv.notify_one();
+}
 
-void DesktopEventBus::signal(std::uint32_t bits) {
-    if (bits == 0)
-        return;
+std::optional<cardboy::sdk::AppEvent> DesktopEventBus::pop(std::optional<std::uint32_t> timeout_ms) {
+    std::unique_lock<std::mutex> lock(mutex);
+    if (queue.empty()) {
+        if (!timeout_ms) {
+            return std::nullopt;
+        }
+        auto timeout = std::chrono::milliseconds(*timeout_ms);
+        cv.wait_for(lock, timeout, [this] { return !queue.empty(); });
+        if (queue.empty()) {
+            return std::nullopt;
+        }
+    }
+    auto event = queue.front();
+    queue.pop_front();
+    return event;
+}
+
+DesktopTimerService::DesktopTimerService(DesktopRuntime& owner, cardboy::sdk::IEventBus& eventBus) :
+    runtime(owner), eventBus(eventBus) {
+    worker = std::thread(&DesktopTimerService::workerLoop, this);
+}
+
+DesktopTimerService::~DesktopTimerService() {
     {
         std::lock_guard<std::mutex> lock(mutex);
-        pendingBits |= bits;
+        stopWorker = true;
     }
     cv.notify_all();
+    if (worker.joinable())
+        worker.join();
+    cancelAllTimers();
 }
 
-void DesktopEventBus::signalFromISR(std::uint32_t bits) { signal(bits); }
+cardboy::sdk::AppTimerHandle DesktopTimerService::scheduleTimer(std::uint32_t delay_ms, bool repeat) {
+    const auto now              = std::chrono::steady_clock::now();
+    const auto effectiveDelayMs = std::chrono::milliseconds(delay_ms);
+    const auto dueTime          = delay_ms == 0 ? now : now + effectiveDelayMs;
+    const auto interval         = std::chrono::milliseconds(
+            std::max<std::uint32_t>(1, repeat ? std::max(delay_ms, 1u) : std::max(delay_ms, 1u)));
 
-std::uint32_t DesktopEventBus::wait(std::uint32_t mask, std::uint32_t timeout_ms) {
-    if (mask == 0)
-        return 0;
+    TimerRecord record{};
+    record.repeat   = repeat;
+    record.interval = interval;
+    record.due      = dueTime;
+    record.active   = true;
 
-    const auto start    = std::chrono::steady_clock::now();
-    const bool infinite = timeout_ms == cardboy::sdk::IEventBus::kWaitForever;
+    {
+        std::lock_guard<std::mutex>  lock(mutex);
+        cardboy::sdk::AppTimerHandle handle = cardboy::sdk::kInvalidAppTimer;
+        do {
+            handle = nextHandle++;
+        } while (handle == cardboy::sdk::kInvalidAppTimer);
+        if (nextHandle == cardboy::sdk::kInvalidAppTimer)
+            ++nextHandle;
+        record.handle = handle;
+        timers.push_back(record);
+        wakeWorker();
+        return handle;
+    }
+}
 
-    while (true) {
-        {
-            std::lock_guard<std::mutex> lock(mutex);
-            const std::uint32_t         ready = pendingBits & mask;
-            if (ready != 0) {
-                pendingBits &= ~mask;
-                return ready;
+void DesktopTimerService::cancelTimer(cardboy::sdk::AppTimerHandle handle) {
+    if (handle == cardboy::sdk::kInvalidAppTimer)
+        return;
+    std::lock_guard<std::mutex> lock(mutex);
+    for (auto& record: timers) {
+        if (record.handle == handle)
+            record.active = false;
+    }
+    cleanupInactive();
+    wakeWorker();
+}
+
+void DesktopTimerService::cancelAllTimers() {
+    std::lock_guard<std::mutex> lock(mutex);
+    for (auto& record: timers) {
+        record.active = false;
+    }
+    cleanupInactive();
+    wakeWorker();
+}
+
+void DesktopTimerService::workerLoop() {
+    std::unique_lock<std::mutex> lock(mutex);
+    while (!stopWorker) {
+        cleanupInactive();
+        if (timers.empty()) {
+            cv.wait(lock, [this] { return stopWorker || !timers.empty(); });
+            continue;
+        }
+
+        auto nextIt = std::min_element(timers.begin(), timers.end(),
+                                       [](const TimerRecord& a, const TimerRecord& b) { return a.due < b.due; });
+
+        if (nextIt == timers.end())
+            continue;
+
+        if (!nextIt->active)
+            continue;
+
+        const auto now = std::chrono::steady_clock::now();
+        if (now >= nextIt->due) {
+            TimerRecord record = *nextIt;
+            if (record.repeat) {
+                nextIt->due = now + record.interval;
+            } else {
+                nextIt->active = false;
             }
+            lock.unlock();
+
+            cardboy::sdk::AppTimerEvent timerEvent{};
+            timerEvent.handle = record.handle;
+
+            cardboy::sdk::AppEvent event{};
+            event.timestamp_ms = runtime.clock.millis();
+            event.data         = timerEvent;
+            eventBus.post(event);
+
+            lock.lock();
+            continue;
         }
 
-        if (!infinite) {
-            const auto now       = std::chrono::steady_clock::now();
-            const auto elapsedMs = std::chrono::duration_cast<std::chrono::milliseconds>(now - start).count();
-            if (elapsedMs >= static_cast<std::int64_t>(timeout_ms))
-                return 0;
-            const auto remaining = timeout_ms - static_cast<std::uint32_t>(elapsedMs);
-            runtime.sleepFor(std::min<std::uint32_t>(remaining, 8));
-        } else {
-            runtime.sleepFor(8);
-        }
+        cv.wait_until(lock, nextIt->due, [this] { return stopWorker; });
     }
 }
 
-void DesktopEventBus::scheduleTimerSignal(std::uint32_t delay_ms) {
-    cancelTimerSignal();
+void DesktopTimerService::wakeWorker() { cv.notify_all(); }
 
-    if (delay_ms == cardboy::sdk::IEventBus::kWaitForever)
-        return;
-
-    if (delay_ms == 0) {
-        signal(cardboy::sdk::to_event_bits(cardboy::sdk::EventBusSignal::Timer));
-        return;
-    }
-
-    {
-        std::lock_guard<std::mutex> lock(timerMutex);
-        timerCancel = false;
-    }
-
-    timerThread = std::thread([this, delay_ms]() {
-        std::unique_lock<std::mutex> lock(timerMutex);
-        const bool                   cancelled =
-                timerCv.wait_for(lock, std::chrono::milliseconds(delay_ms), [this] { return timerCancel; });
-        lock.unlock();
-        if (!cancelled)
-            signal(cardboy::sdk::to_event_bits(cardboy::sdk::EventBusSignal::Timer));
-    });
+void DesktopTimerService::cleanupInactive() {
+    timers.erase(std::remove_if(timers.begin(), timers.end(), [](const TimerRecord& record) { return !record.active; }),
+                 timers.end());
 }
 
-void DesktopEventBus::cancelTimerSignal() {
-    {
-        std::lock_guard<std::mutex> lock(timerMutex);
-        timerCancel = true;
-    }
-    timerCv.notify_all();
-    if (timerThread.joinable())
-        timerThread.join();
-    {
-        std::lock_guard<std::mutex> lock(timerMutex);
-        timerCancel = false;
-    }
+DesktopAppServiceProvider::DesktopAppServiceProvider(DesktopRuntime& owner, cardboy::sdk::IEventBus& bus) :
+    runtime(owner), eventBus(bus) {}
+
+std::unique_ptr<cardboy::sdk::AppScopedServices>
+DesktopAppServiceProvider::createScopedServices(std::uint64_t generation) {
+    (void) generation;
+    auto scoped        = std::make_unique<ScopedServices>();
+    scoped->ownedTimer = std::make_unique<DesktopTimerService>(runtime, eventBus);
+    scoped->timer      = scoped->ownedTimer.get();
+    return scoped;
 }
 
 bool DesktopStorage::readUint32(std::string_view ns, std::string_view key, std::uint32_t& out) {
@@ -149,6 +221,108 @@ bool DesktopFilesystem::mount() {
     return mounted;
 }
 
+void DesktopNotificationCenter::pushNotification(Notification notification) {
+    if (notification.timestamp == 0) {
+        notification.timestamp = static_cast<std::uint64_t>(std::time(nullptr));
+    }
+
+    std::lock_guard<std::mutex> lock(mutex);
+    if (notification.externalId != 0) {
+        for (auto it = entries.begin(); it != entries.end();) {
+            if (it->externalId == notification.externalId)
+                it = entries.erase(it);
+            else
+                ++it;
+        }
+    }
+
+    notification.id     = nextId++;
+    notification.unread = true;
+
+    entries.push_back(std::move(notification));
+    while (entries.size() > kMaxEntries)
+        entries.erase(entries.begin());
+    ++revisionCounter;
+}
+
+std::uint32_t DesktopNotificationCenter::revision() const {
+    std::lock_guard<std::mutex> lock(mutex);
+    return revisionCounter;
+}
+
+std::vector<DesktopNotificationCenter::Notification> DesktopNotificationCenter::recent(std::size_t limit) const {
+    std::lock_guard<std::mutex> lock(mutex);
+    const std::size_t           count = std::min<std::size_t>(limit, entries.size());
+    std::vector<Notification>   result;
+    result.reserve(count);
+    for (std::size_t i = 0; i < count; ++i) {
+        result.push_back(entries[entries.size() - 1 - i]);
+    }
+    return result;
+}
+
+void DesktopNotificationCenter::markAllRead() {
+    std::lock_guard<std::mutex> lock(mutex);
+    bool                        changed = false;
+    for (auto& entry: entries) {
+        if (entry.unread) {
+            entry.unread = false;
+            changed      = true;
+        }
+    }
+    if (changed)
+        ++revisionCounter;
+}
+
+void DesktopNotificationCenter::clear() {
+    std::lock_guard<std::mutex> lock(mutex);
+    if (entries.empty())
+        return;
+    entries.clear();
+    ++revisionCounter;
+}
+
+void DesktopNotificationCenter::removeById(std::uint64_t id) {
+    if (id == 0)
+        return;
+    std::lock_guard<std::mutex> lock(mutex);
+    bool                        removed = false;
+    for (auto it = entries.begin(); it != entries.end();) {
+        if (it->id == id) {
+            it      = entries.erase(it);
+            removed = true;
+        } else {
+            ++it;
+        }
+    }
+    if (removed)
+        ++revisionCounter;
+}
+
+void DesktopNotificationCenter::removeByExternalId(std::uint64_t externalId) {
+    if (externalId == 0)
+        return;
+    std::lock_guard<std::mutex> lock(mutex);
+    bool                        removed = false;
+    for (auto it = entries.begin(); it != entries.end();) {
+        if (it->externalId == externalId) {
+            it      = entries.erase(it);
+            removed = true;
+        } else {
+            ++it;
+        }
+    }
+    if (removed)
+        ++revisionCounter;
+}
+
+DesktopLoopHooks::DesktopLoopHooks(DesktopRuntime& owner) : runtime(owner) {}
+
+void DesktopLoopHooks::onLoopIteration() {
+    runtime.processEvents();
+    runtime.presentIfNeeded();
+}
+
 DesktopFramebuffer::DesktopFramebuffer(DesktopRuntime& runtime) : runtime(runtime) {}
 
 int DesktopFramebuffer::width_impl() const { return cardboy::sdk::kDisplayWidth; }
@@ -176,26 +350,29 @@ DesktopInput::DesktopInput(DesktopRuntime& runtime) : runtime(runtime) {}
 cardboy::sdk::InputState DesktopInput::readState_impl() { return state; }
 
 void DesktopInput::handleKey(sf::Keyboard::Key key, bool pressed) {
-    bool handled = true;
+    const auto oldState = state;
+    bool       handled  = true;
     switch (key) {
         case sf::Keyboard::Key::Up:
+        case sf::Keyboard::Key::W:
             state.up = pressed;
             break;
         case sf::Keyboard::Key::Down:
+        case sf::Keyboard::Key::S:
             state.down = pressed;
             break;
         case sf::Keyboard::Key::Left:
+        case sf::Keyboard::Key::A:
             state.left = pressed;
             break;
         case sf::Keyboard::Key::Right:
+        case sf::Keyboard::Key::D:
             state.right = pressed;
             break;
         case sf::Keyboard::Key::Z:
-        case sf::Keyboard::Key::A:
             state.a = pressed;
             break;
         case sf::Keyboard::Key::X:
-        case sf::Keyboard::Key::S:
             state.b = pressed;
             break;
         case sf::Keyboard::Key::Space:
@@ -208,8 +385,11 @@ void DesktopInput::handleKey(sf::Keyboard::Key key, bool pressed) {
             handled = false;
             break;
     }
-    if (handled)
-        runtime.eventBusService.signal(cardboy::sdk::to_event_bits(cardboy::sdk::EventBusSignal::Input));
+    if (handled && oldState != state) {
+        cardboy::sdk::AppButtonEvent btnEvent{oldState, state};
+        cardboy::sdk::AppEvent       event{runtime.clock.millis(), btnEvent};
+        runtime.eventBusService.post(event);
+    }
 }
 
 DesktopClock::DesktopClock(DesktopRuntime& runtime) : runtime(runtime), start(std::chrono::steady_clock::now()) {}
@@ -227,23 +407,29 @@ DesktopRuntime::DesktopRuntime() :
            "Cardboy Desktop"),
     texture(), sprite(texture),
     pixels(static_cast<std::size_t>(cardboy::sdk::kDisplayWidth * cardboy::sdk::kDisplayHeight) * 4, 0),
-    framebuffer(*this), input(*this), clock(*this), eventBusService(*this) {
+    framebuffer(*this), input(*this), clock(*this), eventBusService(), appServiceProvider(*this, eventBusService),
+    loopHooksService(*this) {
     window.setFramerateLimit(60);
     if (!texture.resize(sf::Vector2u{cardboy::sdk::kDisplayWidth, cardboy::sdk::kDisplayHeight}))
         throw std::runtime_error("Failed to allocate texture for desktop framebuffer");
     sprite.setTexture(texture, true);
     sprite.setScale(sf::Vector2f{static_cast<float>(kPixelScale), static_cast<float>(kPixelScale)});
-    clearPixels(true);
+    clearPixels(false);
     presentIfNeeded();
+    window.requestFocus();
 
-    services.buzzer       = &buzzerService;
-    services.battery      = &batteryService;
-    services.storage      = &storageService;
-    services.random       = &randomService;
-    services.highResClock = &highResService;
-    services.filesystem   = &filesystemService;
-    services.eventBus     = &eventBusService;
-    services.loopHooks    = nullptr;
+    std::cout << "Desktop window initialized and presented." << std::endl;
+
+    services.buzzer        = &buzzerService;
+    services.battery       = &batteryService;
+    services.storage       = &storageService;
+    services.random        = &randomService;
+    services.highResClock  = &highResService;
+    services.filesystem    = &filesystemService;
+    services.eventBus      = &eventBusService;
+    services.appServices   = &appServiceProvider;
+    services.loopHooks     = &loopHooksService;
+    services.notifications = &notificationService;
 }
 
 cardboy::sdk::Services& DesktopRuntime::serviceRegistry() { return services; }

Firmware/sdk/core/include/cardboy/gfx/font16x8.hpp

@@ -14,8 +14,6 @@ constexpr unsigned char kFallbackChar = '?';
 
 inline unsigned char normalizeChar(char ch) {
     unsigned char uc = static_cast<unsigned char>(ch);
-    if (uc >= 'a' && uc <= 'z')
-        uc = static_cast<unsigned char>(std::toupper(static_cast<unsigned char>(uc)));
     if (!std::isprint(static_cast<unsigned char>(uc)))
         return kFallbackChar;
     return uc;

Firmware/sdk/core/include/cardboy/sdk/app_framework.hpp

@@ -1,11 +1,13 @@
 #pragma once
 
+#include <cardboy/sdk/app_events.hpp>
 #include <cardboy/sdk/backend.hpp>
 #include <cardboy/sdk/platform.hpp>
 #include <cardboy/sdk/services.hpp>
 
 #include <cstdint>
 #include <memory>
+#include <optional>
 #include <string>
 #include <string_view>
 #include <vector>
@@ -14,30 +16,6 @@ namespace cardboy::sdk {
 
 class AppSystem;
 
-using AppTimerHandle                      = std::uint32_t;
-constexpr AppTimerHandle kInvalidAppTimer = 0;
-
-enum class AppEventType {
-    Button,
-    Timer,
-};
-
-struct AppButtonEvent {
-    InputState current{};
-    InputState previous{};
-};
-
-struct AppTimerEvent {
-    AppTimerHandle handle = kInvalidAppTimer;
-};
-
-struct AppEvent {
-    AppEventType   type;
-    std::uint32_t  timestamp_ms = 0;
-    AppButtonEvent button{};
-    AppTimerEvent  timer{};
-};
-
 using ActiveBackend = cardboy::backend::ActiveBackend;
 
 struct AppContext {
@@ -56,72 +34,52 @@ struct AppContext {
 
     [[nodiscard]] Services* getServices() const { return services; }
 
-    [[nodiscard]] IBuzzer*         buzzer() const { return services ? services->buzzer : nullptr; }
-    [[nodiscard]] IBatteryMonitor* battery() const { return services ? services->battery : nullptr; }
-    [[nodiscard]] IStorage*        storage() const { return services ? services->storage : nullptr; }
-    [[nodiscard]] IRandom*         random() const { return services ? services->random : nullptr; }
-    [[nodiscard]] IHighResClock*   highResClock() const { return services ? services->highResClock : nullptr; }
-    [[nodiscard]] IFilesystem*     filesystem() const { return services ? services->filesystem : nullptr; }
-    [[nodiscard]] IEventBus*       eventBus() const { return services ? services->eventBus : nullptr; }
-    [[nodiscard]] ILoopHooks*      loopHooks() const { return services ? services->loopHooks : nullptr; }
+    [[nodiscard]] IBuzzer*             buzzer() const { return services ? services->buzzer : nullptr; }
+    [[nodiscard]] IBatteryMonitor*     battery() const { return services ? services->battery : nullptr; }
+    [[nodiscard]] IStorage*            storage() const { return services ? services->storage : nullptr; }
+    [[nodiscard]] IRandom*             random() const { return services ? services->random : nullptr; }
+    [[nodiscard]] IHighResClock*       highResClock() const { return services ? services->highResClock : nullptr; }
+    [[nodiscard]] IFilesystem*         filesystem() const { return services ? services->filesystem : nullptr; }
+    [[nodiscard]] AppScopedServices*   appServices() const { return _scopedServices; }
+    [[nodiscard]] IEventBus*           eventBus() const { return services ? services->eventBus : nullptr; }
+    [[nodiscard]] ITimerService*       timer() const { return _scopedServices ? _scopedServices->timer : nullptr; }
+    [[nodiscard]] ILoopHooks*          loopHooks() const { return services ? services->loopHooks : nullptr; }
+    [[nodiscard]] INotificationCenter* notificationCenter() const {
+        return services ? services->notifications : nullptr;
+    }
 
     void requestAppSwitchByIndex(std::size_t index) {
-        pendingAppIndex = index;
-        pendingAppName.clear();
-        pendingSwitchByName = false;
-        pendingSwitch       = true;
+        _pendingAppIndex = index;
+        _pendingAppName.clear();
+        _pendingSwitchByName = false;
+        _pendingSwitch       = true;
     }
 
     void requestAppSwitchByName(std::string_view name) {
-        pendingAppName.assign(name.begin(), name.end());
-        pendingSwitchByName = true;
-        pendingSwitch       = true;
+        _pendingAppName.assign(name.begin(), name.end());
+        _pendingSwitchByName = true;
+        _pendingSwitch       = true;
     }
 
-    [[nodiscard]] bool hasPendingAppSwitch() const { return pendingSwitch; }
-
-    AppTimerHandle scheduleTimer(std::uint32_t delay_ms, bool repeat = false) {
-        if (!system)
-            return kInvalidAppTimer;
-        return scheduleTimerInternal(delay_ms, repeat);
-    }
-
-    AppTimerHandle scheduleRepeatingTimer(std::uint32_t interval_ms) {
-        if (!system)
-            return kInvalidAppTimer;
-        return scheduleTimerInternal(interval_ms, true);
-    }
-
-    void cancelTimer(AppTimerHandle handle) {
-        if (!system)
-            return;
-        cancelTimerInternal(handle);
-    }
-
-    void cancelAllTimers() {
-        if (!system)
-            return;
-        cancelAllTimersInternal();
-    }
+    [[nodiscard]] bool hasPendingAppSwitch() const { return _pendingSwitch; }
 
 private:
     friend class AppSystem;
-    bool        pendingSwitch       = false;
-    bool        pendingSwitchByName = false;
-    std::size_t pendingAppIndex     = 0;
-    std::string pendingAppName;
+    bool               _pendingSwitch       = false;
+    bool               _pendingSwitchByName = false;
+    std::size_t        _pendingAppIndex     = 0;
+    std::string        _pendingAppName;
+    AppScopedServices* _scopedServices = nullptr;
 
-    AppTimerHandle scheduleTimerInternal(std::uint32_t delay_ms, bool repeat);
-    void           cancelTimerInternal(AppTimerHandle handle);
-    void           cancelAllTimersInternal();
+    void setScopedServices(AppScopedServices* services) { _scopedServices = services; }
 };
 
 class IApp {
 public:
     virtual ~IApp() = default;
-    virtual void onStart() {}
-    virtual void onStop() {}
-    virtual void handleEvent(const AppEvent& event) = 0;
+    virtual void                         onStart() {}
+    virtual void                         onStop() {}
+    virtual std::optional<std::uint32_t> handleEvent(const AppEvent& event) = 0;
 };
 
 class IAppFactory {

Firmware/sdk/core/include/cardboy/sdk/app_system.hpp

@@ -1,6 +1,5 @@
 #pragma once
 
-#include <cardboy/sdk/event_bus.hpp>
 #include "app_framework.hpp"
 
 #include <cstdint>
@@ -16,68 +15,31 @@ public:
     ~AppSystem();
 
     void registerApp(std::unique_ptr<IAppFactory> factory);
-    bool startApp(const std::string& name);
-    bool startAppByIndex(std::size_t index);
+    void startApp(const std::string& name);
+    void startAppByIndex(std::size_t index);
 
     void run();
 
-    [[nodiscard]] std::size_t        appCount() const { return factories.size(); }
+    [[nodiscard]] std::size_t        appCount() const { return _factories.size(); }
     [[nodiscard]] const IAppFactory* factoryAt(std::size_t index) const;
     [[nodiscard]] std::size_t        indexOfFactory(const IAppFactory* factory) const;
-    [[nodiscard]] std::size_t        currentFactoryIndex() const { return activeIndex; }
+    [[nodiscard]] std::size_t        currentFactoryIndex() const { return _activeIndex; }
 
-    [[nodiscard]] const IApp*        currentApp() const { return current.get(); }
-    [[nodiscard]] const IAppFactory* currentFactory() const { return activeFactory; }
+    [[nodiscard]] const IApp*        currentApp() const { return _current.get(); }
+    [[nodiscard]] const IAppFactory* currentFactory() const { return _activeFactory; }
 
 private:
-    friend struct AppContext;
+    void                               handlePendingSwitchRequest();
+    std::unique_ptr<AppScopedServices> createAppScopedServices(std::uint64_t generation);
 
-    struct TimerRecord {
-        AppTimerHandle id          = kInvalidAppTimer;
-        std::uint32_t  generation  = 0;
-        std::uint32_t  due_ms      = 0;
-        std::uint32_t  interval_ms = 0;
-        bool           repeat      = false;
-        bool           active      = false;
-    };
-
-    AppTimerHandle scheduleTimer(std::uint32_t delay_ms, bool repeat);
-    void           cancelTimer(AppTimerHandle handle);
-    void           cancelAllTimers();
-
-    void dispatchEvent(const AppEvent& event);
-
-    void          processDueTimers(std::uint32_t now, std::vector<AppEvent>& outEvents);
-    std::uint32_t nextTimerDueMs(std::uint32_t now) const;
-    void          clearTimersForCurrentApp();
-    TimerRecord*  findTimer(AppTimerHandle handle);
-    bool          handlePendingSwitchRequest();
-    void          notifyEventBus(EventBusSignal signal);
-
-    AppContext                                context;
-    std::vector<std::unique_ptr<IAppFactory>> factories;
-    std::unique_ptr<IApp>                     current;
-    IAppFactory*                              activeFactory = nullptr;
-    std::size_t                               activeIndex   = static_cast<std::size_t>(-1);
-    std::vector<TimerRecord>                  timers;
-    AppTimerHandle                            nextTimerId       = 1;
-    std::uint32_t                             currentGeneration = 0;
-    InputState                                lastInputState{};
-    bool                                      suppressInputs = false;
+    AppContext                                _context;
+    std::vector<std::unique_ptr<IAppFactory>> _factories;
+    std::unique_ptr<IApp>                     _current;
+    IAppFactory*                              _activeFactory = nullptr;
+    std::size_t                               _activeIndex   = static_cast<std::size_t>(-1);
+    std::unique_ptr<AppScopedServices>        _scopedServices;
+    std::uint64_t                             _nextScopedGeneration = 1;
+    std::optional<std::uint32_t>              _currentTimeout;
 };
 
-inline AppTimerHandle AppContext::scheduleTimerInternal(std::uint32_t delay_ms, bool repeat) {
-    return system ? system->scheduleTimer(delay_ms, repeat) : kInvalidAppTimer;
-}
-
-inline void AppContext::cancelTimerInternal(AppTimerHandle handle) {
-    if (system)
-        system->cancelTimer(handle);
-}
-
-inline void AppContext::cancelAllTimersInternal() {
-    if (system)
-        system->cancelAllTimers();
-}
-
 } // namespace cardboy::sdk

Firmware/sdk/core/include/cardboy/sdk/framebuffer_hooks.hpp

@@ -13,8 +13,8 @@ public:
     static void invokePreSend(void* framebuffer);
 
 private:
-    static PreSendHook hook_;
-    static void*       userData_;
+    static PreSendHook _hook;
+    static void*       _userData;
 };
 
 } // namespace cardboy::sdk

Firmware/sdk/core/include/cardboy/sdk/status_bar.hpp

@@ -17,11 +17,11 @@ class StatusBar {
 public:
     static StatusBar& instance();
 
-    void setServices(Services* services) { services_ = services; }
+    void setServices(Services* services) { _services = services; }
 
     void               setEnabled(bool value);
     void               toggle();
-    [[nodiscard]] bool isEnabled() const { return enabled_; }
+    [[nodiscard]] bool isEnabled() const { return _enabled; }
 
     void setCurrentAppName(std::string_view name);
 
@@ -29,7 +29,7 @@ public:
 
     template<typename Framebuffer>
     void renderIfEnabled(Framebuffer& fb) {
-        if (!enabled_)
+        if (!_enabled)
             return;
         renderBar(fb);
     }
@@ -56,9 +56,6 @@ private:
                 fb.drawPixel(x, y, true);
         }
 
-        for (int x = 0; x < width; ++x)
-            fb.drawPixel(x, 0, false);
-
         const int textY            = 1;
         const int bottomSeparatorY = textY + font16x8::kGlyphHeight + 1;
         if (bottomSeparatorY < fillHeight) {
@@ -84,9 +81,9 @@ private:
     [[nodiscard]] std::string prepareLeftText(int displayWidth) const;
     [[nodiscard]] std::string prepareRightText() const;
 
-    bool        enabled_  = false;
-    Services*   services_ = nullptr;
-    std::string appName_{};
+    bool        _enabled  = false;
+    Services*   _services = nullptr;
+    std::string _appName{};
 };
 
 } // namespace cardboy::sdk

Firmware/sdk/core/src/app_system.cpp

@@ -3,19 +3,11 @@
 #include "cardboy/sdk/status_bar.hpp"
 
 #include <algorithm>
-#include <limits>
+#include <optional>
 #include <utility>
 
 namespace cardboy::sdk {
 namespace {
-[[nodiscard]] bool inputsDiffer(const InputState& a, const InputState& b) {
-    return a.up != b.up || a.down != b.down || a.left != b.left || a.right != b.right || a.a != b.a || a.b != b.b ||
-           a.select != b.select || a.start != b.start;
-}
-
-[[nodiscard]] bool anyButtonPressed(const InputState& state) {
-    return state.up || state.down || state.left || state.right || state.a || state.b || state.select || state.start;
-}
 
 template<typename Framebuffer>
 void statusBarPreSendHook(void* framebuffer, void* userData) {
@@ -26,263 +18,128 @@ void statusBarPreSendHook(void* framebuffer, void* userData) {
 }
 } // namespace
 
-AppSystem::AppSystem(AppContext ctx) : context(std::move(ctx)) {
-    context.system  = this;
+AppSystem::AppSystem(AppContext ctx) : _context(std::move(ctx)) {
+    _context.system = this;
     auto& statusBar = StatusBar::instance();
-    statusBar.setServices(context.services);
-    using FBType = typename AppContext::Framebuffer;
-    FramebufferHooks::setPreSendHook(&statusBarPreSendHook<FBType>, &statusBar);
+    statusBar.setServices(_context.services);
+    FramebufferHooks::setPreSendHook(&statusBarPreSendHook<AppContext::Framebuffer>, &statusBar);
 }
 
 AppSystem::~AppSystem() { FramebufferHooks::clearPreSendHook(); }
 
 void AppSystem::registerApp(std::unique_ptr<IAppFactory> factory) {
-    if (!factory)
-        return;
-    factories.emplace_back(std::move(factory));
+    assert(factory);
+    _factories.emplace_back(std::move(factory));
 }
 
-bool AppSystem::startApp(const std::string& name) {
-    for (std::size_t i = 0; i < factories.size(); ++i) {
-        if (factories[i]->name() == name)
-            return startAppByIndex(i);
+void AppSystem::startApp(const std::string& name) {
+    for (std::size_t i = 0; i < _factories.size(); ++i) {
+        if (_factories[i]->name() == name)
+            startAppByIndex(i);
     }
-    return false;
 }
 
-bool AppSystem::startAppByIndex(std::size_t index) {
-    if (index >= factories.size())
-        return false;
+void AppSystem::startAppByIndex(std::size_t index) {
+    assert(index < _factories.size());
 
-    context.system = this;
-    auto& factory  = factories[index];
-    auto  app      = factory->create(context);
-    if (!app)
-        return false;
-
-    if (current) {
-        current->onStop();
-        current.reset();
+    if (_current) {
+        _current->onStop();
+        _current.reset();
     }
 
-    activeFactory               = factory.get();
-    activeIndex                 = index;
-    context.pendingSwitch       = false;
-    context.pendingSwitchByName = false;
-    context.pendingAppName.clear();
-    clearTimersForCurrentApp();
-    current        = std::move(app);
-    lastInputState = context.input.readState();
-    suppressInputs = true;
-    StatusBar::instance().setServices(context.services);
-    StatusBar::instance().setCurrentAppName(activeFactory ? activeFactory->name() : "");
-    current->onStart();
-    return true;
+    _context.system = this;
+
+    auto& factory = _factories[index];
+
+    const std::uint64_t newGeneration = _nextScopedGeneration++;
+
+    auto app = factory->create(_context);
+    assert(app);
+
+    _scopedServices.reset();
+    auto scoped     = createAppScopedServices(newGeneration);
+    _scopedServices = std::move(scoped);
+    _context.setScopedServices(_scopedServices.get());
+
+    _activeFactory                = factory.get();
+    _activeIndex                  = index;
+    _context._pendingSwitch       = false;
+    _context._pendingSwitchByName = false;
+    _context._pendingAppName.clear();
+    _current        = std::move(app);
+    _currentTimeout = std::nullopt;
+    StatusBar::instance().setServices(_context.services);
+    StatusBar::instance().setCurrentAppName(_activeFactory ? _activeFactory->name() : "");
+    _current->onStart();
 }
 
 void AppSystem::run() {
-    if (!current) {
-        if (factories.empty() || !startAppByIndex(0))
-            return;
+    if (!_current) {
+        assert(!_factories.empty());
+        startAppByIndex(0);
     }
 
-    std::vector<AppEvent> events;
-    events.reserve(4);
-
     while (true) {
-        if (auto* hooks = context.loopHooks())
+        if (auto* hooks = _context.loopHooks())
             hooks->onLoopIteration();
 
-        events.clear();
-        const std::uint32_t now = context.clock.millis();
-        processDueTimers(now, events);
-
-        const InputState inputNow               = context.input.readState();
-        const bool       consumedByStatusToggle = StatusBar::instance().handleToggleInput(inputNow, lastInputState);
-
-        if (suppressInputs) {
-            lastInputState = inputNow;
-            if (!anyButtonPressed(inputNow))
-                suppressInputs = false;
-        } else if (!consumedByStatusToggle && inputsDiffer(inputNow, lastInputState)) {
-            AppEvent evt{};
-            evt.type            = AppEventType::Button;
-            evt.timestamp_ms    = now;
-            evt.button.current  = inputNow;
-            evt.button.previous = lastInputState;
-            events.push_back(evt);
-            lastInputState = inputNow;
-        } else if (consumedByStatusToggle) {
-            lastInputState = inputNow;
-        }
-
-        for (const auto& evt: events) {
-            dispatchEvent(evt);
-            if (handlePendingSwitchRequest())
-                break;
-        }
-
-        const std::uint32_t waitBase = context.clock.millis();
-        std::uint32_t       waitMs   = nextTimerDueMs(waitBase);
-
-        if (waitMs == 0)
-            continue;
-
-        auto* eventBus = context.eventBus();
-        if (!eventBus)
-            return;
-
-        const std::uint32_t mask = to_event_bits(EventBusSignal::Input) | to_event_bits(EventBusSignal::Timer);
-
-        if (waitMs == std::numeric_limits<std::uint32_t>::max()) {
-            eventBus->cancelTimerSignal();
-            eventBus->wait(mask, IEventBus::kWaitForever);
+        AppEvent event;
+        auto     event_opt = _context.eventBus()->pop(_currentTimeout);
+        if (!event_opt) {
+            event = AppEvent{_context.clock.millis(), AppTimeoutEvent{}};
         } else {
-            eventBus->scheduleTimerSignal(waitMs);
-            eventBus->wait(mask, IEventBus::kWaitForever);
+            event = *event_opt;
+        }
+
+        if (const auto* btn = event.button()) {
+            const bool consumedByStatusToggle = StatusBar::instance().handleToggleInput(btn->current, btn->previous);
+            if (consumedByStatusToggle) {
+                continue;
+            }
+        }
+        _currentTimeout = _current->handleEvent(event);
+        if (_context._pendingSwitch) {
+            handlePendingSwitchRequest();
+            continue;
         }
     }
 }
 
 const IAppFactory* AppSystem::factoryAt(std::size_t index) const {
-    if (index >= factories.size())
+    if (index >= _factories.size())
         return nullptr;
-    return factories[index].get();
+    return _factories[index].get();
 }
 
 std::size_t AppSystem::indexOfFactory(const IAppFactory* factory) const {
     if (!factory)
         return static_cast<std::size_t>(-1);
-    for (std::size_t i = 0; i < factories.size(); ++i) {
-        if (factories[i].get() == factory)
+    for (std::size_t i = 0; i < _factories.size(); ++i) {
+        if (_factories[i].get() == factory)
             return i;
     }
     return static_cast<std::size_t>(-1);
 }
 
-AppTimerHandle AppSystem::scheduleTimer(std::uint32_t delay_ms, bool repeat) {
-    if (!current)
-        return kInvalidAppTimer;
-    TimerRecord record;
-    record.id = nextTimerId++;
-    if (record.id == kInvalidAppTimer)
-        record.id = nextTimerId++;
-    record.generation  = currentGeneration;
-    const auto now     = context.clock.millis();
-    record.due_ms      = now + delay_ms;
-    record.interval_ms = repeat ? std::max<std::uint32_t>(1, delay_ms) : 0;
-    record.repeat      = repeat;
-    record.active      = true;
-    timers.push_back(record);
-    notifyEventBus(EventBusSignal::Timer);
-    return record.id;
-}
-
-void AppSystem::cancelTimer(AppTimerHandle handle) {
-    auto* timer = findTimer(handle);
-    if (!timer)
-        return;
-    timer->active = false;
-    timers.erase(std::remove_if(timers.begin(), timers.end(), [](const TimerRecord& rec) { return !rec.active; }),
-                 timers.end());
-    notifyEventBus(EventBusSignal::Timer);
-}
-
-void AppSystem::cancelAllTimers() {
-    bool changed = false;
-    for (auto& timer: timers) {
-        if (timer.generation == currentGeneration && timer.active) {
-            timer.active = false;
-            changed      = true;
-        }
-    }
-    timers.erase(std::remove_if(timers.begin(), timers.end(), [](const TimerRecord& rec) { return !rec.active; }),
-                 timers.end());
-    if (changed)
-        notifyEventBus(EventBusSignal::Timer);
-}
-
-void AppSystem::dispatchEvent(const AppEvent& event) {
-    if (current)
-        current->handleEvent(event);
-}
-
-void AppSystem::processDueTimers(std::uint32_t now, std::vector<AppEvent>& outEvents) {
-    for (auto& timer: timers) {
-        if (!timer.active || timer.generation != currentGeneration)
-            continue;
-        if (static_cast<std::int32_t>(now - timer.due_ms) >= 0) {
-            AppEvent ev{};
-            ev.type         = AppEventType::Timer;
-            ev.timestamp_ms = now;
-            ev.timer.handle = timer.id;
-            outEvents.push_back(ev);
-            if (timer.repeat) {
-                const std::uint32_t interval = timer.interval_ms ? timer.interval_ms : 1;
-                timer.due_ms                 = now + interval;
-            } else {
-                timer.active = false;
-            }
-        }
-    }
-    timers.erase(std::remove_if(timers.begin(), timers.end(), [](const TimerRecord& rec) { return !rec.active; }),
-                 timers.end());
-}
-
-std::uint32_t AppSystem::nextTimerDueMs(std::uint32_t now) const {
-    std::uint32_t minWait = std::numeric_limits<std::uint32_t>::max();
-    for (const auto& timer: timers) {
-        if (!timer.active || timer.generation != currentGeneration)
-            continue;
-        if (static_cast<std::int32_t>(now - timer.due_ms) >= 0)
-            return 0;
-        const std::uint32_t delta = timer.due_ms - now;
-        if (delta < minWait)
-            minWait = delta;
-    }
-    return minWait;
-}
-
-void AppSystem::clearTimersForCurrentApp() {
-    const bool hadTimers = !timers.empty();
-    ++currentGeneration;
-    timers.clear();
-    if (hadTimers)
-        notifyEventBus(EventBusSignal::Timer);
-}
-
-AppSystem::TimerRecord* AppSystem::findTimer(AppTimerHandle handle) {
-    for (auto& timer: timers) {
-        if (!timer.active || timer.generation != currentGeneration)
-            continue;
-        if (timer.id == handle)
-            return &timer;
-    }
-    return nullptr;
-}
-
-bool AppSystem::handlePendingSwitchRequest() {
-    if (!context.pendingSwitch)
-        return false;
-    const bool        byName    = context.pendingSwitchByName;
-    const std::size_t reqIndex  = context.pendingAppIndex;
-    const std::string reqName   = context.pendingAppName;
-    context.pendingSwitch       = false;
-    context.pendingSwitchByName = false;
-    context.pendingAppName.clear();
+void AppSystem::handlePendingSwitchRequest() {
+    assert(_context._pendingSwitch);
+    const bool        byName      = _context._pendingSwitchByName;
+    const std::size_t reqIndex    = _context._pendingAppIndex;
+    const std::string reqName     = _context._pendingAppName;
+    _context._pendingSwitch       = false;
+    _context._pendingSwitchByName = false;
+    _context._pendingAppName.clear();
     bool switched = false;
     if (byName)
-        switched = startApp(reqName);
+        startApp(reqName);
     else
-        switched = startAppByIndex(reqIndex);
-    return switched;
+        startAppByIndex(reqIndex);
 }
 
-void AppSystem::notifyEventBus(EventBusSignal signal) {
-    if (signal == EventBusSignal::None)
-        return;
-    if (auto* bus = context.eventBus())
-        bus->signal(to_event_bits(signal));
+std::unique_ptr<AppScopedServices> AppSystem::createAppScopedServices(std::uint64_t generation) {
+    if (!_context.services || !_context.services->appServices)
+        return nullptr;
+    return _context.services->appServices->createScopedServices(generation);
 }
 
 } // namespace cardboy::sdk

Firmware/sdk/core/src/framebuffer_hooks.cpp

@@ -2,22 +2,22 @@
 
 namespace cardboy::sdk {
 
-FramebufferHooks::PreSendHook FramebufferHooks::hook_     = nullptr;
-void*                         FramebufferHooks::userData_ = nullptr;
+FramebufferHooks::PreSendHook FramebufferHooks::_hook     = nullptr;
+void*                         FramebufferHooks::_userData = nullptr;
 
 void FramebufferHooks::setPreSendHook(PreSendHook hook, void* userData) {
-    hook_     = hook;
-    userData_ = userData;
+    _hook     = hook;
+    _userData = userData;
 }
 
 void FramebufferHooks::clearPreSendHook() {
-    hook_     = nullptr;
-    userData_ = nullptr;
+    _hook     = nullptr;
+    _userData = nullptr;
 }
 
 void FramebufferHooks::invokePreSend(void* framebuffer) {
-    if (hook_)
-        hook_(framebuffer, userData_);
+    if (_hook)
+        _hook(framebuffer, _userData);
 }
 
 } // namespace cardboy::sdk

Firmware/sdk/core/src/status_bar.cpp

@@ -12,17 +12,17 @@ StatusBar& StatusBar::instance() {
     return bar;
 }
 
-void StatusBar::setEnabled(bool value) { enabled_ = value; }
+void StatusBar::setEnabled(bool value) { _enabled = value; }
 
 void StatusBar::toggle() {
-    enabled_ = !enabled_;
-    if (services_ && services_->buzzer)
-        services_->buzzer->beepMove();
+    _enabled = !_enabled;
+    if (_services && _services->buzzer)
+        _services->buzzer->beepMove();
 }
 
 void StatusBar::setCurrentAppName(std::string_view name) {
-    appName_.assign(name.begin(), name.end());
-    std::transform(appName_.begin(), appName_.end(), appName_.begin(),
+    _appName.assign(name.begin(), name.end());
+    std::transform(_appName.begin(), _appName.end(), _appName.begin(),
                    [](unsigned char ch) { return static_cast<char>(std::toupper(ch)); });
 }
 
@@ -37,7 +37,7 @@ bool StatusBar::handleToggleInput(const InputState& current, const InputState& p
 }
 
 std::string StatusBar::prepareLeftText(int displayWidth) const {
-    std::string text     = appName_.empty() ? std::string("CARDBOY") : appName_;
+    std::string text     = _appName.empty() ? std::string("CARDBOY") : _appName;
     int         maxWidth = std::max(0, displayWidth - 32);
     while (!text.empty() && font16x8::measureText(text, 1, 1) > maxWidth)
         text.pop_back();
@@ -45,25 +45,21 @@ std::string StatusBar::prepareLeftText(int displayWidth) const {
 }
 
 std::string StatusBar::prepareRightText() const {
-    if (!services_)
+    if (!_services)
         return {};
 
     std::string right;
-    if (services_->battery && services_->battery->hasData()) {
-        const float current   = services_->battery->current();
-        const float chargeMah = services_->battery->charge();
-        const float fallbackV = services_->battery->voltage();
+    if (_services->battery && _services->battery->hasData()) {
+        const float current    = _services->battery->current();
+        const float chargeMah  = _services->battery->charge();
+        const float percentage = _services->battery->percentage();
         char        buf[64];
-        if (std::isfinite(current) && std::isfinite(chargeMah)) {
-            std::snprintf(buf, sizeof(buf), "cur %.2fmA chr %.2fmAh", static_cast<double>(current),
-                          static_cast<double>(chargeMah));
-        } else {
-            std::snprintf(buf, sizeof(buf), "vol %.2fV", static_cast<double>(fallbackV));
-        }
+        std::snprintf(buf, sizeof(buf), "%.2fmA %.2fmAh %.0f%%", static_cast<double>(current),
+                      static_cast<double>(chargeMah), static_cast<double>(percentage));
         right.assign(buf);
     }
 
-    if (services_->buzzer && services_->buzzer->isMuted()) {
+    if (_services->buzzer && _services->buzzer->isMuted()) {
         if (!right.empty())
             right.append(" ");
         right.append("MUTE");

Firmware/sdk/launchers/desktop/src/main.cpp

@@ -1,7 +1,9 @@
 #include "cardboy/apps/clock_app.hpp"
 #include "cardboy/apps/gameboy_app.hpp"
 #include "cardboy/apps/menu_app.hpp"
+#include "cardboy/apps/lockscreen_app.hpp"
 #include "cardboy/apps/settings_app.hpp"
+#include "cardboy/apps/snake_app.hpp"
 #include "cardboy/apps/tetris_app.hpp"
 #include "cardboy/backend/desktop_backend.hpp"
 #include "cardboy/sdk/app_system.hpp"
@@ -26,9 +28,11 @@ int main() {
             buzzer->setMuted(persistentSettings.mute);
 
         system.registerApp(apps::createMenuAppFactory());
+        system.registerApp(apps::createLockscreenAppFactory());
         system.registerApp(apps::createSettingsAppFactory());
         system.registerApp(apps::createClockAppFactory());
         system.registerApp(apps::createGameboyAppFactory());
+        system.registerApp(apps::createSnakeAppFactory());
         system.registerApp(apps::createTetrisAppFactory());
 
         system.run();

Firmware/sdkconfig

@@ -567,9 +567,9 @@ CONFIG_SECURE_TEE_LOG_LEVEL=0
 # Serial flasher config
 #
 # CONFIG_ESPTOOLPY_NO_STUB is not set
-# CONFIG_ESPTOOLPY_FLASHMODE_QIO is not set
+CONFIG_ESPTOOLPY_FLASHMODE_QIO=y
 # CONFIG_ESPTOOLPY_FLASHMODE_QOUT is not set
-CONFIG_ESPTOOLPY_FLASHMODE_DIO=y
+# CONFIG_ESPTOOLPY_FLASHMODE_DIO is not set
 # CONFIG_ESPTOOLPY_FLASHMODE_DOUT is not set
 CONFIG_ESPTOOLPY_FLASH_SAMPLE_MODE_STR=y
 CONFIG_ESPTOOLPY_FLASHMODE="dio"
@@ -695,7 +695,7 @@ CONFIG_BT_NIMBLE_ROLE_BROADCASTER=y
 CONFIG_BT_NIMBLE_ROLE_OBSERVER=y
 CONFIG_BT_NIMBLE_GATT_CLIENT=y
 CONFIG_BT_NIMBLE_GATT_SERVER=y
-# CONFIG_BT_NIMBLE_NVS_PERSIST is not set
+CONFIG_BT_NIMBLE_NVS_PERSIST=y
 # CONFIG_BT_NIMBLE_SMP_ID_RESET is not set
 CONFIG_BT_NIMBLE_SECURITY_ENABLE=y
 CONFIG_BT_NIMBLE_SM_LEGACY=y
@@ -1217,7 +1217,7 @@ CONFIG_SPI_SLAVE_ISR_IN_IRAM=y
 # ESP-Driver:USB Serial/JTAG Configuration
 #
 CONFIG_USJ_ENABLE_USB_SERIAL_JTAG=y
-# CONFIG_USJ_NO_AUTO_LS_ON_CONNECTION is not set
+CONFIG_USJ_NO_AUTO_LS_ON_CONNECTION=y
 # end of ESP-Driver:USB Serial/JTAG Configuration
 
 #
@@ -2458,9 +2458,9 @@ CONFIG_LOG_BOOTLOADER_LEVEL_INFO=y
 # CONFIG_LOG_BOOTLOADER_LEVEL_VERBOSE is not set
 CONFIG_LOG_BOOTLOADER_LEVEL=3
 # CONFIG_FLASH_ENCRYPTION_ENABLED is not set
-# CONFIG_FLASHMODE_QIO is not set
+CONFIG_FLASHMODE_QIO=y
 # CONFIG_FLASHMODE_QOUT is not set
-CONFIG_FLASHMODE_DIO=y
+# CONFIG_FLASHMODE_DIO is not set
 # CONFIG_FLASHMODE_DOUT is not set
 CONFIG_MONITOR_BAUD=115200
 # CONFIG_OPTIMIZATION_LEVEL_DEBUG is not set
@@ -2497,7 +2497,7 @@ CONFIG_NIMBLE_ROLE_CENTRAL=y
 CONFIG_NIMBLE_ROLE_PERIPHERAL=y
 CONFIG_NIMBLE_ROLE_BROADCASTER=y
 CONFIG_NIMBLE_ROLE_OBSERVER=y
-# CONFIG_NIMBLE_NVS_PERSIST is not set
+CONFIG_NIMBLE_NVS_PERSIST=y
 CONFIG_NIMBLE_SM_LEGACY=y
 CONFIG_NIMBLE_SM_SC=y
 # CONFIG_NIMBLE_SM_SC_DEBUG_KEYS is not set

Firmware/sdkconfig.old

@@ -599,13 +599,13 @@ CONFIG_ESPTOOLPY_MONITOR_BAUD=115200
 #
 # Partition Table
 #
-CONFIG_PARTITION_TABLE_SINGLE_APP=y
+# CONFIG_PARTITION_TABLE_SINGLE_APP is not set
 # CONFIG_PARTITION_TABLE_SINGLE_APP_LARGE is not set
 # CONFIG_PARTITION_TABLE_TWO_OTA is not set
 # CONFIG_PARTITION_TABLE_TWO_OTA_LARGE is not set
-# CONFIG_PARTITION_TABLE_CUSTOM is not set
+CONFIG_PARTITION_TABLE_CUSTOM=y
 CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions.csv"
-CONFIG_PARTITION_TABLE_FILENAME="partitions_singleapp.csv"
+CONFIG_PARTITION_TABLE_FILENAME="partitions.csv"
 CONFIG_PARTITION_TABLE_OFFSET=0x8000
 CONFIG_PARTITION_TABLE_MD5=y
 # end of Partition Table
@@ -644,7 +644,7 @@ CONFIG_COMPILER_RT_LIB_GCCLIB=y
 CONFIG_COMPILER_RT_LIB_NAME="gcc"
 CONFIG_COMPILER_ORPHAN_SECTIONS_WARNING=y
 # CONFIG_COMPILER_ORPHAN_SECTIONS_PLACE is not set
-CONFIG_COMPILER_STATIC_ANALYZER=y
+# CONFIG_COMPILER_STATIC_ANALYZER is not set
 # end of Compiler options
 
 #
@@ -695,7 +695,7 @@ CONFIG_BT_NIMBLE_ROLE_BROADCASTER=y
 CONFIG_BT_NIMBLE_ROLE_OBSERVER=y
 CONFIG_BT_NIMBLE_GATT_CLIENT=y
 CONFIG_BT_NIMBLE_GATT_SERVER=y
-# CONFIG_BT_NIMBLE_NVS_PERSIST is not set
+CONFIG_BT_NIMBLE_NVS_PERSIST=y
 # CONFIG_BT_NIMBLE_SMP_ID_RESET is not set
 CONFIG_BT_NIMBLE_SECURITY_ENABLE=y
 CONFIG_BT_NIMBLE_SM_LEGACY=y
@@ -1699,9 +1699,13 @@ CONFIG_FREERTOS_TIMER_TASK_STACK_DEPTH=2048
 CONFIG_FREERTOS_TIMER_QUEUE_LENGTH=10
 CONFIG_FREERTOS_QUEUE_REGISTRY_SIZE=0
 CONFIG_FREERTOS_TASK_NOTIFICATION_ARRAY_ENTRIES=1
-# CONFIG_FREERTOS_USE_TRACE_FACILITY is not set
+CONFIG_FREERTOS_USE_TRACE_FACILITY=y
+CONFIG_FREERTOS_USE_STATS_FORMATTING_FUNCTIONS=y
 # CONFIG_FREERTOS_USE_LIST_DATA_INTEGRITY_CHECK_BYTES is not set
-# CONFIG_FREERTOS_GENERATE_RUN_TIME_STATS is not set
+# CONFIG_FREERTOS_VTASKLIST_INCLUDE_COREID is not set
+CONFIG_FREERTOS_GENERATE_RUN_TIME_STATS=y
+CONFIG_FREERTOS_RUN_TIME_COUNTER_TYPE_U32=y
+# CONFIG_FREERTOS_RUN_TIME_COUNTER_TYPE_U64 is not set
 CONFIG_FREERTOS_USE_TICKLESS_IDLE=y
 CONFIG_FREERTOS_IDLE_TIME_BEFORE_SLEEP=3
 # CONFIG_FREERTOS_USE_APPLICATION_TASK_TAG is not set
@@ -1722,6 +1726,7 @@ CONFIG_FREERTOS_TICK_SUPPORT_SYSTIMER=y
 CONFIG_FREERTOS_CORETIMER_SYSTIMER_LVL1=y
 # CONFIG_FREERTOS_CORETIMER_SYSTIMER_LVL3 is not set
 CONFIG_FREERTOS_SYSTICK_USES_SYSTIMER=y
+CONFIG_FREERTOS_RUN_TIME_STATS_USING_ESP_TIMER=y
 # CONFIG_FREERTOS_PLACE_FUNCTIONS_INTO_FLASH is not set
 # CONFIG_FREERTOS_CHECK_PORT_CRITICAL_COMPLIANCE is not set
 # end of Port
@@ -1757,16 +1762,16 @@ CONFIG_HAL_WDT_USE_ROM_IMPL=y
 #
 # Heap memory debugging
 #
-CONFIG_HEAP_POISONING_DISABLED=y
+# CONFIG_HEAP_POISONING_DISABLED is not set
 # CONFIG_HEAP_POISONING_LIGHT is not set
-# CONFIG_HEAP_POISONING_COMPREHENSIVE is not set
+CONFIG_HEAP_POISONING_COMPREHENSIVE=y
 CONFIG_HEAP_TRACING_OFF=y
 # CONFIG_HEAP_TRACING_STANDALONE is not set
 # CONFIG_HEAP_TRACING_TOHOST is not set
 # CONFIG_HEAP_USE_HOOKS is not set
 # CONFIG_HEAP_TASK_TRACKING is not set
 # CONFIG_HEAP_ABORT_WHEN_ALLOCATION_FAILS is not set
-CONFIG_HEAP_TLSF_USE_ROM_IMPL=y
+# CONFIG_HEAP_TLSF_USE_ROM_IMPL is not set
 # CONFIG_HEAP_PLACE_FUNCTION_INTO_FLASH is not set
 # end of Heap memory debugging
 
@@ -2410,6 +2415,211 @@ CONFIG_WL_SECTOR_SIZE=4096
 CONFIG_WIFI_PROV_SCAN_MAX_ENTRIES=16
 CONFIG_WIFI_PROV_AUTOSTOP_TIMEOUT=30
 CONFIG_WIFI_PROV_BLE_SEC_CONN=y
+
+#
+# LittleFS
+#
+# CONFIG_LITTLEFS_SDMMC_SUPPORT is not set
+CONFIG_LITTLEFS_MAX_PARTITIONS=3
+CONFIG_LITTLEFS_PAGE_SIZE=256
+CONFIG_LITTLEFS_OBJ_NAME_LEN=64
+CONFIG_LITTLEFS_READ_SIZE=128
+CONFIG_LITTLEFS_WRITE_SIZE=128
+CONFIG_LITTLEFS_LOOKAHEAD_SIZE=128
+CONFIG_LITTLEFS_CACHE_SIZE=512
+CONFIG_LITTLEFS_BLOCK_CYCLES=512
+CONFIG_LITTLEFS_USE_MTIME=y
+# CONFIG_LITTLEFS_USE_ONLY_HASH is not set
+# CONFIG_LITTLEFS_HUMAN_READABLE is not set
+CONFIG_LITTLEFS_MTIME_USE_SECONDS=y
+# CONFIG_LITTLEFS_MTIME_USE_NONCE is not set
+# CONFIG_LITTLEFS_SPIFFS_COMPAT is not set
+# CONFIG_LITTLEFS_FLUSH_FILE_EVERY_WRITE is not set
+# CONFIG_LITTLEFS_FCNTL_GET_PATH is not set
+# CONFIG_LITTLEFS_MULTIVERSION is not set
+# CONFIG_LITTLEFS_MALLOC_STRATEGY_DISABLE is not set
+CONFIG_LITTLEFS_MALLOC_STRATEGY_DEFAULT=y
+# CONFIG_LITTLEFS_MALLOC_STRATEGY_INTERNAL is not set
+CONFIG_LITTLEFS_ASSERTS=y
+# CONFIG_LITTLEFS_MMAP_PARTITION is not set
+# end of LittleFS
 # end of Component config
 
 # CONFIG_IDF_EXPERIMENTAL_FEATURES is not set
+
+# Deprecated options for backward compatibility
+# CONFIG_APP_BUILD_TYPE_ELF_RAM is not set
+# CONFIG_NO_BLOBS is not set
+# CONFIG_APP_ROLLBACK_ENABLE is not set
+# CONFIG_LOG_BOOTLOADER_LEVEL_NONE is not set
+# CONFIG_LOG_BOOTLOADER_LEVEL_ERROR is not set
+# CONFIG_LOG_BOOTLOADER_LEVEL_WARN is not set
+CONFIG_LOG_BOOTLOADER_LEVEL_INFO=y
+# CONFIG_LOG_BOOTLOADER_LEVEL_DEBUG is not set
+# CONFIG_LOG_BOOTLOADER_LEVEL_VERBOSE is not set
+CONFIG_LOG_BOOTLOADER_LEVEL=3
+# CONFIG_FLASH_ENCRYPTION_ENABLED is not set
+# CONFIG_FLASHMODE_QIO is not set
+# CONFIG_FLASHMODE_QOUT is not set
+CONFIG_FLASHMODE_DIO=y
+# CONFIG_FLASHMODE_DOUT is not set
+CONFIG_MONITOR_BAUD=115200
+CONFIG_OPTIMIZATION_LEVEL_DEBUG=y
+CONFIG_COMPILER_OPTIMIZATION_LEVEL_DEBUG=y
+CONFIG_COMPILER_OPTIMIZATION_DEFAULT=y
+# CONFIG_OPTIMIZATION_LEVEL_RELEASE is not set
+# CONFIG_COMPILER_OPTIMIZATION_LEVEL_RELEASE is not set
+CONFIG_OPTIMIZATION_ASSERTIONS_ENABLED=y
+# CONFIG_OPTIMIZATION_ASSERTIONS_SILENT is not set
+# CONFIG_OPTIMIZATION_ASSERTIONS_DISABLED is not set
+CONFIG_OPTIMIZATION_ASSERTION_LEVEL=2
+# CONFIG_CXX_EXCEPTIONS is not set
+# CONFIG_STACK_CHECK_NONE is not set
+# CONFIG_STACK_CHECK_NORM is not set
+CONFIG_STACK_CHECK_STRONG=y
+# CONFIG_STACK_CHECK_ALL is not set
+CONFIG_STACK_CHECK=y
+CONFIG_WARN_WRITE_STRINGS=y
+# CONFIG_ESP32_APPTRACE_DEST_TRAX is not set
+CONFIG_ESP32_APPTRACE_DEST_NONE=y
+CONFIG_ESP32_APPTRACE_LOCK_ENABLE=y
+# CONFIG_BLUEDROID_ENABLED is not set
+CONFIG_NIMBLE_ENABLED=y
+CONFIG_NIMBLE_MEM_ALLOC_MODE_INTERNAL=y
+# CONFIG_NIMBLE_MEM_ALLOC_MODE_DEFAULT is not set
+CONFIG_NIMBLE_MAX_CONNECTIONS=3
+CONFIG_NIMBLE_MAX_BONDS=3
+CONFIG_NIMBLE_MAX_CCCDS=8
+CONFIG_NIMBLE_L2CAP_COC_MAX_NUM=0
+CONFIG_NIMBLE_PINNED_TO_CORE=0
+CONFIG_NIMBLE_TASK_STACK_SIZE=4096
+CONFIG_BT_NIMBLE_TASK_STACK_SIZE=4096
+CONFIG_NIMBLE_ROLE_CENTRAL=y
+CONFIG_NIMBLE_ROLE_PERIPHERAL=y
+CONFIG_NIMBLE_ROLE_BROADCASTER=y
+CONFIG_NIMBLE_ROLE_OBSERVER=y
+CONFIG_NIMBLE_NVS_PERSIST=y
+CONFIG_NIMBLE_SM_LEGACY=y
+CONFIG_NIMBLE_SM_SC=y
+# CONFIG_NIMBLE_SM_SC_DEBUG_KEYS is not set
+CONFIG_BT_NIMBLE_SM_SC_LVL=0
+# CONFIG_NIMBLE_DEBUG is not set
+CONFIG_NIMBLE_SVC_GAP_DEVICE_NAME="nimble"
+CONFIG_NIMBLE_GAP_DEVICE_NAME_MAX_LEN=31
+CONFIG_NIMBLE_ATT_PREFERRED_MTU=256
+CONFIG_NIMBLE_SVC_GAP_APPEARANCE=0
+CONFIG_BT_NIMBLE_MSYS1_BLOCK_COUNT=24
+CONFIG_BT_NIMBLE_ACL_BUF_COUNT=24
+CONFIG_BT_NIMBLE_ACL_BUF_SIZE=255
+CONFIG_BT_NIMBLE_HCI_EVT_BUF_SIZE=70
+CONFIG_BT_NIMBLE_HCI_EVT_HI_BUF_COUNT=30
+CONFIG_BT_NIMBLE_HCI_EVT_LO_BUF_COUNT=8
+CONFIG_NIMBLE_RPA_TIMEOUT=900
+# CONFIG_NIMBLE_MESH is not set
+CONFIG_NIMBLE_CRYPTO_STACK_MBEDTLS=y
+# CONFIG_BT_NIMBLE_COEX_PHY_CODED_TX_RX_TLIM_EN is not set
+CONFIG_BT_NIMBLE_COEX_PHY_CODED_TX_RX_TLIM_DIS=y
+CONFIG_SW_COEXIST_ENABLE=y
+CONFIG_ESP32_WIFI_SW_COEXIST_ENABLE=y
+CONFIG_ESP_WIFI_SW_COEXIST_ENABLE=y
+# CONFIG_ANA_CMPR_ISR_IRAM_SAFE is not set
+# CONFIG_GPTIMER_ISR_IRAM_SAFE is not set
+# CONFIG_MCPWM_ISR_IRAM_SAFE is not set
+# CONFIG_EVENT_LOOP_PROFILING is not set
+CONFIG_POST_EVENTS_FROM_ISR=y
+CONFIG_POST_EVENTS_FROM_IRAM_ISR=y
+CONFIG_GDBSTUB_SUPPORT_TASKS=y
+CONFIG_GDBSTUB_MAX_TASKS=32
+# CONFIG_OTA_ALLOW_HTTP is not set
+CONFIG_ESP_SYSTEM_PD_FLASH=y
+CONFIG_PERIPH_CTRL_FUNC_IN_IRAM=y
+CONFIG_BROWNOUT_DET=y
+# CONFIG_BROWNOUT_DET_LVL_SEL_7 is not set
+# CONFIG_BROWNOUT_DET_LVL_SEL_6 is not set
+# CONFIG_BROWNOUT_DET_LVL_SEL_5 is not set
+# CONFIG_BROWNOUT_DET_LVL_SEL_4 is not set
+CONFIG_BROWNOUT_DET_LVL_SEL_3=y
+# CONFIG_BROWNOUT_DET_LVL_SEL_2 is not set
+# CONFIG_BROWNOUT_DET_LVL_SEL_1 is not set
+# CONFIG_BROWNOUT_DET_LVL_SEL_0 is not set
+CONFIG_BROWNOUT_DET_LVL=3
+CONFIG_ESP_SYSTEM_BROWNOUT_INTR=y
+CONFIG_ESP32_PHY_CALIBRATION_AND_DATA_STORAGE=y
+CONFIG_ESP32_PHY_MAX_WIFI_TX_POWER=20
+CONFIG_ESP32_PHY_MAX_TX_POWER=20
+# CONFIG_REDUCE_PHY_TX_POWER is not set
+# CONFIG_ESP32_REDUCE_PHY_TX_POWER is not set
+CONFIG_ESP_SYSTEM_PM_POWER_DOWN_CPU=y
+CONFIG_ESP32_RTC_XTAL_BOOTSTRAP_CYCLES=0
+CONFIG_SYSTEM_EVENT_QUEUE_SIZE=32
+CONFIG_SYSTEM_EVENT_TASK_STACK_SIZE=2304
+CONFIG_MAIN_TASK_STACK_SIZE=3584
+CONFIG_CONSOLE_UART_DEFAULT=y
+# CONFIG_CONSOLE_UART_CUSTOM is not set
+# CONFIG_CONSOLE_UART_NONE is not set
+# CONFIG_ESP_CONSOLE_UART_NONE is not set
+CONFIG_CONSOLE_UART=y
+CONFIG_CONSOLE_UART_NUM=0
+CONFIG_CONSOLE_UART_BAUDRATE=115200
+CONFIG_INT_WDT=y
+CONFIG_INT_WDT_TIMEOUT_MS=300
+CONFIG_TASK_WDT=y
+CONFIG_ESP_TASK_WDT=y
+# CONFIG_TASK_WDT_PANIC is not set
+CONFIG_TASK_WDT_TIMEOUT_S=5
+CONFIG_TASK_WDT_CHECK_IDLE_TASK_CPU0=y
+# CONFIG_ESP32_DEBUG_STUBS_ENABLE is not set
+CONFIG_IPC_TASK_STACK_SIZE=1024
+CONFIG_TIMER_TASK_STACK_SIZE=3584
+# CONFIG_ESP32_ENABLE_COREDUMP_TO_FLASH is not set
+# CONFIG_ESP32_ENABLE_COREDUMP_TO_UART is not set
+CONFIG_ESP32_ENABLE_COREDUMP_TO_NONE=y
+CONFIG_TIMER_TASK_PRIORITY=1
+CONFIG_TIMER_TASK_STACK_DEPTH=2048
+CONFIG_TIMER_QUEUE_LENGTH=10
+# CONFIG_ENABLE_STATIC_TASK_CLEAN_UP_HOOK is not set
+# CONFIG_HAL_ASSERTION_SILIENT is not set
+# CONFIG_L2_TO_L3_COPY is not set
+CONFIG_ESP_GRATUITOUS_ARP=y
+CONFIG_GARP_TMR_INTERVAL=60
+CONFIG_TCPIP_RECVMBOX_SIZE=32
+CONFIG_TCP_MAXRTX=12
+CONFIG_TCP_SYNMAXRTX=12
+CONFIG_TCP_MSS=1440
+CONFIG_TCP_MSL=60000
+CONFIG_TCP_SND_BUF_DEFAULT=5760
+CONFIG_TCP_WND_DEFAULT=5760
+CONFIG_TCP_RECVMBOX_SIZE=6
+CONFIG_TCP_QUEUE_OOSEQ=y
+CONFIG_TCP_OVERSIZE_MSS=y
+# CONFIG_TCP_OVERSIZE_QUARTER_MSS is not set
+# CONFIG_TCP_OVERSIZE_DISABLE is not set
+CONFIG_UDP_RECVMBOX_SIZE=6
+CONFIG_TCPIP_TASK_STACK_SIZE=3072
+CONFIG_TCPIP_TASK_AFFINITY_NO_AFFINITY=y
+# CONFIG_TCPIP_TASK_AFFINITY_CPU0 is not set
+CONFIG_TCPIP_TASK_AFFINITY=0x7FFFFFFF
+# CONFIG_PPP_SUPPORT is not set
+CONFIG_NEWLIB_STDOUT_LINE_ENDING_CRLF=y
+# CONFIG_NEWLIB_STDOUT_LINE_ENDING_LF is not set
+# CONFIG_NEWLIB_STDOUT_LINE_ENDING_CR is not set
+# CONFIG_NEWLIB_STDIN_LINE_ENDING_CRLF is not set
+# CONFIG_NEWLIB_STDIN_LINE_ENDING_LF is not set
+CONFIG_NEWLIB_STDIN_LINE_ENDING_CR=y
+# CONFIG_NEWLIB_NANO_FORMAT is not set
+CONFIG_NEWLIB_TIME_SYSCALL_USE_RTC_HRT=y
+# CONFIG_NEWLIB_TIME_SYSCALL_USE_RTC is not set
+# CONFIG_NEWLIB_TIME_SYSCALL_USE_HRT is not set
+# CONFIG_NEWLIB_TIME_SYSCALL_USE_NONE is not set
+CONFIG_ESP32_PTHREAD_TASK_PRIO_DEFAULT=5
+CONFIG_ESP32_PTHREAD_TASK_STACK_SIZE_DEFAULT=3072
+CONFIG_ESP32_PTHREAD_STACK_MIN=768
+CONFIG_ESP32_PTHREAD_TASK_CORE_DEFAULT=-1
+CONFIG_ESP32_PTHREAD_TASK_NAME_DEFAULT="pthread"
+CONFIG_SPI_FLASH_WRITING_DANGEROUS_REGIONS_ABORTS=y
+# CONFIG_SPI_FLASH_WRITING_DANGEROUS_REGIONS_FAILS is not set
+# CONFIG_SPI_FLASH_WRITING_DANGEROUS_REGIONS_ALLOWED is not set
+CONFIG_SUPPRESS_SELECT_DEBUG_OUTPUT=y
+CONFIG_SUPPORT_TERMIOS=y
+CONFIG_SEMIHOSTFS_MAX_MOUNT_POINTS=1
+# End of deprecated options