[ltdc-stm32f4] add helper function to convert rgb565 to rgb888

2014-12-10 19:16:36 +01:00 · 2014-12-10 19:16:36 +01:00 · 3c9b07d776
parent c26831fab0
commit 3c9b07d776
1 changed files with 10 additions and 0 deletions
--- a/include/libopencm3/stm32/f4/ltdc.h
+++ b/include/libopencm3/stm32/f4/ltdc.h
@ -168,6 +168,16 @@ void ltdc_setup_windowing(
 		uint16_t active_width,  uint16_t active_height
 );

+/**
+ * color conversion helper function
+ * (simulate the ltdc color conversion)
+ */
+
+#define ltdc_get_rgb888_from_rgb565(rgb888) ( \
+	((((rgb888) & 0xF800) >> (11-8))/31)<<16    \
+  | ((((rgb888) & 0x07E0) << ( 8-5))/63)<<8     \
+  | ((((rgb888) & 0x001F) << ( 8-0))/31)<<0     \
+)


 #endif /* LIBOPENCM3_STM32_F4_LTDC_H_ */