Better handling of unsupported chips (#398)

CMakeLists.txt

@@ -1,3 +1,6 @@
+# get IDF version for comparison
+set(idf_version "${IDF_VERSION_MAJOR}.${IDF_VERSION_MINOR}")
+
 # set conversion sources
 set(COMPONENT_SRCS
   conversions/yuv.c
@@ -16,6 +19,8 @@ set(COMPONENT_ADD_INCLUDEDIRS
   conversions/include
   )
 
+set(COMPONENT_REQUIRES driver)
+
 # set driver sources only for supported platforms
 if(IDF_TARGET STREQUAL "esp32" OR IDF_TARGET STREQUAL "esp32s2" OR IDF_TARGET STREQUAL "esp32s3")
   list(APPEND COMPONENT_SRCS
@@ -68,14 +73,11 @@ if(IDF_TARGET STREQUAL "esp32" OR IDF_TARGET STREQUAL "esp32s2" OR IDF_TARGET ST
       )
   endif()
 
-  set(COMPONENT_REQUIRES driver)
   set(COMPONENT_PRIV_REQUIRES freertos nvs_flash)
 
-  set(min_supported_idf_version "4.2")
-  set(idf_version "${IDF_VERSION_MAJOR}.${IDF_VERSION_MINOR}")
-  if (idf_version VERSION_GREATER_EQUAL min_supported_idf_version)
+  set(min_version_for_esp_timer "4.2")
+  if (idf_version VERSION_GREATER_EQUAL min_version_for_esp_timer)
     list(APPEND COMPONENT_PRIV_REQUIRES esp_timer)
-    message(WARNING "ESP-IDF version detected: '${idf_version}'.")
   endif()
 
 endif()

conversions/esp_jpg_decode.c

@@ -61,7 +61,7 @@ static const char * jd_errors[] = {
     "Not supported JPEG standard"
 };
 
-static uint32_t _jpg_write(JDEC *decoder, void *bitmap, JRECT *rect)
+static unsigned int _jpg_write(JDEC *decoder, void *bitmap, JRECT *rect)
 {
     uint16_t x = rect->left;
     uint16_t y = rect->top;
@@ -77,7 +77,7 @@ static uint32_t _jpg_write(JDEC *decoder, void *bitmap, JRECT *rect)
     return 0;
 }
 
-static uint32_t _jpg_read(JDEC *decoder, uint8_t *buf, uint32_t len)
+static unsigned int _jpg_read(JDEC *decoder, uint8_t *buf, unsigned int len)
 {
     esp_jpg_decoder_t * jpeg = (esp_jpg_decoder_t *)decoder->device;
     if (jpeg->len && len > (jpeg->len - jpeg->index)) {

conversions/to_bmp.c

@@ -160,7 +160,7 @@ static bool _rgb565_write(void * arg, uint16_t x, uint16_t y, uint16_t w, uint16
 }
 
 //input buffer
-static uint32_t _jpg_read(void * arg, size_t index, uint8_t *buf, size_t len)
+static unsigned int _jpg_read(void * arg, size_t index, uint8_t *buf, size_t len)
 {
     rgb_jpg_decoder * jpeg = (rgb_jpg_decoder *)arg;
     if(buf) {