some refactoring

Firmware/components/sdk-esp/CMakeLists.txt

@@ -1,21 +1,21 @@
 idf_component_register(
-        PRIV_REQUIRES driver esp_timer esp_driver_spi
+        INCLUDE_DIRS ""
+        REQUIRES backend-esp
 )
 
-add_subdirectory("${CMAKE_CURRENT_LIST_DIR}/../../sdk" cb-sdk-build)
+set(CARDBOY_BUILD_SFML OFF CACHE BOOL "Disable desktop backend build" FORCE)
+set(CARDBOY_SDK_BACKEND_LIBRARY cardboy_backend_esp CACHE STRING "Cardboy backend implementation" FORCE)
 
-target_include_directories(cardboy_backend
-        INTERFACE
-        ${CMAKE_CURRENT_LIST_DIR}/../../main/include
-)
+add_subdirectory("${CMAKE_CURRENT_LIST_DIR}/../../sdk/core" cb-sdk-build-core)
+add_subdirectory("${CMAKE_CURRENT_LIST_DIR}/../../sdk/apps" cb-sdk-build-apps)
 
-target_compile_options(cardboy_backend
+target_compile_options(cardboy_backend_esp
         INTERFACE
         -fjump-tables
         -ftree-switch-conversion
 )
 
-target_link_libraries(cardboy_backend
+target_link_libraries(cardboy_backend_esp
         INTERFACE
         idf::driver
         idf::esp_timer
@@ -25,7 +25,7 @@ target_link_libraries(cardboy_backend
 
 target_link_libraries(${COMPONENT_LIB}
         INTERFACE
-        cardboy_backend
+        cardboy_backend_esp
         cardboy_sdk
         cardboy_apps
 )