Add esp32 camera dir (#23)

minor change
that allows to override the directories where the includes exist for
the esp32-camera component. It should function the same as before, if you do not provide an override.

---------

Signed-off-by: John Gentilin <gentijo@gmail.com>

src/micropython.cmake

@@ -8,14 +8,20 @@ target_sources(usermod_mp_camera INTERFACE
     ${CMAKE_CURRENT_LIST_DIR}/modcamera_api.c
 )
 
-if(EXISTS "${IDF_PATH}/components/esp32-camera")
+if(NOT ESP32_CAMERA_DIR)
+    set(ESP32_CAMERA_DIR "${IDF_PATH}/components/esp32-camera")
+endif()
+
+message("Camera Dir: ${ESP32_CAMERA_DIR}")
+
+if(EXISTS "${ESP32_CAMERA_DIR}")
     target_include_directories(usermod_mp_camera INTERFACE
         ${CMAKE_CURRENT_LIST_DIR}
-        ${IDF_PATH}/components/esp32-camera/driver/include
-        ${IDF_PATH}/components/esp32-camera/driver/private_include
-        ${IDF_PATH}/components/esp32-camera/conversions/include
-        ${IDF_PATH}/components/esp32-camera/conversions/private_include
-        ${IDF_PATH}/components/esp32-camera/sensors/private_include
+        ${ESP32_CAMERA_DIR}/driver/include
+        ${ESP32_CAMERA_DIR}/driver/private_include
+        ${ESP32_CAMERA_DIR}/conversions/include
+        ${ESP32_CAMERA_DIR}/conversions/private_include
+        ${ESP32_CAMERA_DIR}/sensors/private_include
     )
 else()
     target_include_directories(usermod_mp_camera INTERFACE
@@ -32,4 +38,4 @@ endif()
 
 target_link_libraries(usermod INTERFACE usermod_mp_camera)
 
-micropy_gather_target_properties(usermod_mp_camera)
+micropy_gather_target_properties(usermod_mp_camera)