battery percentage

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/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/esp_backend.cpp

@@ -78,6 +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 {

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

@@ -7,6 +7,7 @@
 
 #include <algorithm>
 #include <array>
+#include <cmath>
 #include <cstdio>
 #include <ctime>
 #include <string>
@@ -31,12 +32,12 @@ using Framebuffer = typename AppContext::Framebuffer;
 using Clock       = typename AppContext::Clock;
 
 constexpr std::array<std::uint8_t, font16x8::kGlyphHeight> kArrowUpGlyph{
-        0b00011000, 0b00111100, 0b01111110, 0b11111111, 0b00011000, 0b00011000, 0b00011000, 0b00011000,
-        0b00011000, 0b00011000, 0b00011000, 0b00011000, 0b00011000, 0b00011000, 0b00000000, 0b00000000};
+        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, 0b00011000, 0b00011000, 0b00011000, 0b00011000, 0b00011000, 0b00011000,
-        0b00011000, 0b00011000, 0b00011000, 0b11111111, 0b01111110, 0b00111100, 0b00011000, 0b00000000};
+        0b00000000, 0b00000000, 0b00010000, 0b00010000, 0b00010000, 0b00010000, 0b00010000, 0b00010000,
+        0b00010000, 0b00010000, 0b00010000, 0b11111110, 0b01111100, 0b00111000, 0b00010000, 0b00000000};
 
 struct TimeSnapshot {
     bool          hasWallTime   = false;
@@ -130,12 +131,14 @@ private:
         if (!notifications.empty() && (upPressed || downPressed)) {
             const std::size_t count       = notifications.size();
             lastNotificationInteractionMs = clock.millis();
-            navPressed                    = true;
             if (count > 1) {
-                if (upPressed)
-                    selectedNotification = (selectedNotification + count - 1) % count;
-                else if (downPressed)
-                    selectedNotification = (selectedNotification + 1) % count;
+                if (upPressed && selectedNotification > 0) {
+                    selectedNotification--;
+                    navPressed = true;
+                } else if (downPressed && selectedNotification < count - 1) {
+                    selectedNotification++;
+                    navPressed = true;
+                }
             }
         }
 
@@ -444,6 +447,18 @@ private:
 
         framebuffer.frameReady();
 
+        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;
@@ -500,8 +515,10 @@ private:
                     const int arrowsTotalWide = arrowWidth * 2 + arrowSpacing;
                     const int arrowX          = counterX + (counterWidth - arrowsTotalWide) / 2;
                     const int arrowY          = cardMarginTop + cardPadding + textLineHeight + 1;
-                    drawArrow(framebuffer, arrowX, arrowY, true, scaleSmall);
-                    drawArrow(framebuffer, arrowX + arrowWidth + arrowSpacing, arrowY, false, scaleSmall);
+                    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);
                 }
@@ -524,28 +541,13 @@ private:
                 const int summaryX     = (framebuffer.width() - summaryWidth) / 2;
                 const int summaryY     = cardMarginTop;
                 font16x8::drawText(framebuffer, summaryX, summaryY, summary, scaleSmall, true, 1);
-
-                if (notifications.size() > 1) {
-                    const int arrowWidth      = font16x8::kGlyphWidth * scaleSmall;
-                    const int arrowSpacing    = std::max(1, scaleSmall);
-                    const int arrowsTotalWide = arrowWidth * 2 + arrowSpacing;
-                    const int arrowX          = (framebuffer.width() - arrowsTotalWide) / 2;
-                    const int arrowY          = summaryY + textLineHeight + 1;
-                    drawArrow(framebuffer, arrowX, arrowY, true, scaleSmall);
-                    drawArrow(framebuffer, arrowX + arrowWidth + arrowSpacing, arrowY, false, scaleSmall);
-                    const int arrowHeight = font16x8::kGlyphHeight * scaleSmall;
-                    cardHeight            = std::max(cardHeight, arrowY + arrowHeight - cardMarginTop);
-                }
             }
         }
 
         const int defaultTimeY = (framebuffer.height() - font16x8::kGlyphHeight * scaleTime) / 2 - 8;
-        int       timeY        = defaultTimeY;
-        if (cardHeight > 0)
-            timeY = cardMarginTop + cardHeight + 16;
-        const int minTimeY = (cardHeight > 0) ? (cardMarginTop + cardHeight + 12) : 16;
-        const int maxTimeY = std::max(minTimeY, framebuffer.height() - font16x8::kGlyphHeight * scaleTime - 48);
-        timeY              = std::clamp(timeY, minTimeY, maxTimeY);
+        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);
@@ -562,24 +564,18 @@ private:
         const std::string dateLine = formatDate(snap);
         drawCenteredText(framebuffer, timeY + font16x8::kGlyphHeight * scaleTime + 16, dateLine, scaleSmall, 1);
 
-        const std::string instruction      = holdActive ? "KEEP HOLDING A+SELECT" : "HOLD A+SELECT";
+        const std::string instruction      = "HOLD A+SELECT TO UNLOCK";
         const int         instructionWidth = font16x8::measureText(instruction, scaleSmall, 1);
-        const int         barHeight        = 14;
-        const int         barY             = framebuffer.height() - 24;
-        const int         textY            = barY + (barHeight - textLineHeight) / 2;
-        const int         textX            = 8;
-        font16x8::drawText(framebuffer, textX, textY, instruction, scaleSmall, true, 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);
 
-        int barX     = textX + instructionWidth + 12;
-        int barWidth = framebuffer.width() - barX - 8;
-        if (barWidth < 40) {
-            barWidth = 40;
-            barX     = std::min(barX, framebuffer.width() - barWidth - 8);
-        }
-
-        drawRectOutline(framebuffer, barX, barY, barWidth, barHeight);
+        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);

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

@@ -39,6 +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 {

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

@@ -40,233 +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);
-};
-
-class DesktopRandom final : public cardboy::sdk::IRandom {
-public:
-    DesktopRandom();
-
-    [[nodiscard]] std::uint32_t nextUint32() override;
-
-private:
-    std::mt19937                                 rng;
-    std::uniform_int_distribution<std::uint32_t> dist;
-};
-
-class DesktopHighResClock final : public cardboy::sdk::IHighResClock {
-public:
-    DesktopHighResClock();
-
-    [[nodiscard]] std::uint64_t micros() override;
-
-private:
-    const std::chrono::steady_clock::time_point start;
-};
-
-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(); }
-
-private:
-    std::filesystem::path basePathPath;
-    bool                  mounted = false;
-};
-
-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;
-
-private:
-    static constexpr std::size_t kMaxEntries = 8;
-
-    mutable std::mutex        mutex;
-    std::vector<Notification> entries;
-    std::uint64_t             nextId          = 1;
-    std::uint32_t             revisionCounter = 0;
-};
-
-class DesktopLoopHooks final : public cardboy::sdk::ILoopHooks {
-public:
-    explicit DesktopLoopHooks(DesktopRuntime& owner);
-
-    void onLoopIteration() override;
-
-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;
-
-private:
-    std::mutex                         mutex;
-    std::condition_variable            cv;
-    std::deque<cardboy::sdk::AppEvent> queue;
-};
-
-class DesktopTimerService final : public cardboy::sdk::ITimerService {
-public:
-    DesktopTimerService(DesktopRuntime& owner, cardboy::sdk::IEventBus& eventBus);
-    ~DesktopTimerService() override;
-
-    cardboy::sdk::AppTimerHandle scheduleTimer(std::uint32_t delay_ms, bool repeat) override;
-    void                         cancelTimer(cardboy::sdk::AppTimerHandle handle) override;
-    void                         cancelAllTimers() override;
-
-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;
+        static std::string composeKey(std::string_view ns, std::string_view key);
     };
 
-    void workerLoop();
-    void wakeWorker();
-    void cleanupInactive();
+    class DesktopRandom final : public cardboy::sdk::IRandom {
+    public:
+        DesktopRandom();
 
-    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;
-};
+        [[nodiscard]] std::uint32_t nextUint32() override;
 
-class DesktopAppServiceProvider final : public cardboy::sdk::IAppServiceProvider {
-public:
-    DesktopAppServiceProvider(DesktopRuntime& owner, cardboy::sdk::IEventBus& bus);
-
-    [[nodiscard]] std::unique_ptr<cardboy::sdk::AppScopedServices>
-    createScopedServices(std::uint64_t generation) override;
-
-private:
-    struct ScopedServices final : cardboy::sdk::AppScopedServices {
-        std::unique_ptr<DesktopTimerService> ownedTimer;
+    private:
+        std::mt19937                                 rng;
+        std::uniform_int_distribution<std::uint32_t> dist;
     };
 
-    DesktopRuntime&          runtime;
-    cardboy::sdk::IEventBus& eventBus;
-};
+    class DesktopHighResClock final : public cardboy::sdk::IHighResClock {
+    public:
+        DesktopHighResClock();
 
-class DesktopFramebuffer final : public cardboy::sdk::FramebufferFacade<DesktopFramebuffer> {
-public:
-    explicit DesktopFramebuffer(DesktopRuntime& runtime);
+        [[nodiscard]] std::uint64_t micros() 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:
+        const std::chrono::steady_clock::time_point start;
+    };
 
-private:
-    DesktopRuntime& runtime;
-};
+    class DesktopFilesystem final : public cardboy::sdk::IFilesystem {
+    public:
+        DesktopFilesystem();
 
-class DesktopInput final : public cardboy::sdk::InputFacade<DesktopInput> {
-public:
-    explicit DesktopInput(DesktopRuntime& runtime);
+        bool                      mount() override;
+        [[nodiscard]] bool        isMounted() const override { return mounted; }
+        [[nodiscard]] std::string basePath() const override { return basePathPath.string(); }
 
-    cardboy::sdk::InputState readState_impl();
-    void                     handleKey(sf::Keyboard::Key key, bool pressed);
+    private:
+        std::filesystem::path basePathPath;
+        bool                  mounted = false;
+    };
 
-private:
-    DesktopRuntime&          runtime;
-    cardboy::sdk::InputState state{};
-};
+    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;
 
-class DesktopClock final : public cardboy::sdk::ClockFacade<DesktopClock> {
-public:
-    explicit DesktopClock(DesktopRuntime& runtime);
+    private:
+        static constexpr std::size_t kMaxEntries = 8;
 
-    std::uint32_t millis_impl();
-    void          sleep_ms_impl(std::uint32_t ms);
+        mutable std::mutex        mutex;
+        std::vector<Notification> entries;
+        std::uint64_t             nextId          = 1;
+        std::uint32_t             revisionCounter = 0;
+    };
 
-private:
-    DesktopRuntime&                             runtime;
-    const std::chrono::steady_clock::time_point start;
-};
+    class DesktopLoopHooks final : public cardboy::sdk::ILoopHooks {
+    public:
+        explicit DesktopLoopHooks(DesktopRuntime& owner);
 
-class DesktopRuntime {
-public:
-    DesktopRuntime();
+        void onLoopIteration() override;
 
-    cardboy::sdk::Services& serviceRegistry();
-    void                    processEvents();
-    void                    presentIfNeeded();
-    void                    sleepFor(std::uint32_t ms);
+    private:
+        DesktopRuntime& runtime;
+    };
 
-    [[nodiscard]] bool isRunning() const { return running; }
+    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;
 
-    DesktopFramebuffer framebuffer;
-    DesktopInput       input;
-    DesktopClock       clock;
+    private:
+        std::mutex                         mutex;
+        std::condition_variable            cv;
+        std::deque<cardboy::sdk::AppEvent> queue;
+    };
 
-private:
-    friend class DesktopFramebuffer;
-    friend class DesktopInput;
-    friend class DesktopClock;
+    class DesktopTimerService final : public cardboy::sdk::ITimerService {
+    public:
+        DesktopTimerService(DesktopRuntime& owner, cardboy::sdk::IEventBus& eventBus);
+        ~DesktopTimerService() override;
 
-    void setPixel(int x, int y, bool on);
-    void clearPixels(bool on);
+        cardboy::sdk::AppTimerHandle scheduleTimer(std::uint32_t delay_ms, bool repeat) override;
+        void                         cancelTimer(cardboy::sdk::AppTimerHandle handle) override;
+        void                         cancelAllTimers() override;
 
-    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:
+        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;
+        };
 
-    DesktopBuzzer             buzzerService;
-    DesktopBattery            batteryService;
-    DesktopStorage            storageService;
-    DesktopRandom             randomService;
-    DesktopHighResClock       highResService;
-    DesktopFilesystem         filesystemService;
-    DesktopEventBus           eventBusService;
-    DesktopAppServiceProvider appServiceProvider;
-    DesktopNotificationCenter notificationService;
-    DesktopLoopHooks          loopHooksService;
-    cardboy::sdk::Services    services{};
-};
+        void workerLoop();
+        void wakeWorker();
+        void cleanupInactive();
 
-struct Backend {
-    using Framebuffer = DesktopFramebuffer;
-    using Input       = DesktopInput;
-    using Clock       = DesktopClock;
-};
+        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 DesktopAppServiceProvider final : public cardboy::sdk::IAppServiceProvider {
+    public:
+        DesktopAppServiceProvider(DesktopRuntime& owner, cardboy::sdk::IEventBus& bus);
+
+        [[nodiscard]] std::unique_ptr<cardboy::sdk::AppScopedServices>
+        createScopedServices(std::uint64_t generation) override;
+
+    private:
+        struct ScopedServices final : cardboy::sdk::AppScopedServices {
+            std::unique_ptr<DesktopTimerService> ownedTimer;
+        };
+
+        DesktopRuntime&          runtime;
+        cardboy::sdk::IEventBus& eventBus;
+    };
+
+    class DesktopFramebuffer final : public cardboy::sdk::FramebufferFacade<DesktopFramebuffer> {
+    public:
+        explicit DesktopFramebuffer(DesktopRuntime& runtime);
+
+        [[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;
+    };
+
+    class DesktopInput final : public cardboy::sdk::InputFacade<DesktopInput> {
+    public:
+        explicit DesktopInput(DesktopRuntime& runtime);
+
+        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/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/status_bar.hpp

@@ -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) {

Firmware/sdk/core/src/status_bar.cpp

@@ -50,16 +50,12 @@ std::string StatusBar::prepareRightText() const {
 
     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();
+        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);
     }