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display: stm32: ltdc: adjust BGR565/RGB565 format to match sample exp… #92483

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Merged
danieldegrasse merged 1 commit into from
Jul 4, 2025
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display: stm32: ltdc: adjust BGR565/RGB565 format to match sample exp… #92483

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display: stm32: ltdc: fix RGB565/BGR565 format to match sample expect… 
…ations

The LTDC RGB565 format corresponds to the PIXEL_FORMAT_BGR565 format.
Update the LTDC driver to advertise PIXEL_FORMAT_BGR565 as the supported
format instead of PIXEL_FORMAT_RGB565. This change ensures correct color
rendering in the sample display application and enables usage of the
video capture sample application.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
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Alain Volmat committed Jul 2, 2025
commit df0d3355c0512b66b8060af5049996e694a05230
8 changes: 8 additions & 0 deletions doc/releases/migration-guide-4.2.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,14 @@ Counter
And :kconfig:option:`CONFIG_COUNTER_NATIVE_POSIX` and its related options with
:kconfig:option:`CONFIG_COUNTER_NATIVE_SIM` (:github:`86616`).

Display
=======

* On STM32 devices, the LTDC driver (:dtcompatible:`st,stm32-ltdc`) RGB565 format
``PIXEL_FORMAT_RGB565`` has been replaced by ``PIXEL_FORMAT_BGR565`` to match
the format expected by Zephyr. This change ensures proper behavior of both
display and video capture samples.

Entropy
=======

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8 changes: 4 additions & 4 deletions drivers/display/display_stm32_ltdc.c
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Expand Up @@ -55,7 +55,7 @@ LOG_MODULE_REGISTER(display_stm32_ltdc, CONFIG_DISPLAY_LOG_LEVEL);
#elif CONFIG_STM32_LTDC_RGB565
#define STM32_LTDC_INIT_PIXEL_SIZE 2u
#define STM32_LTDC_INIT_PIXEL_FORMAT LTDC_PIXEL_FORMAT_RGB565
#define DISPLAY_INIT_PIXEL_FORMAT PIXEL_FORMAT_RGB_565
#define DISPLAY_INIT_PIXEL_FORMAT PIXEL_FORMAT_BGR_565
#else
#error "Invalid LTDC pixel format chosen"
#endif
Expand Down Expand Up @@ -110,9 +110,9 @@ static int stm32_ltdc_set_pixel_format(const struct device *dev,
struct display_stm32_ltdc_data *data = dev->data;

switch (format) {
case PIXEL_FORMAT_RGB_565:
case PIXEL_FORMAT_BGR_565:
err = HAL_LTDC_SetPixelFormat(&data->hltdc, LTDC_PIXEL_FORMAT_RGB565, 0);
data->current_pixel_format = PIXEL_FORMAT_RGB_565;
data->current_pixel_format = PIXEL_FORMAT_BGR_565;
data->current_pixel_size = 2u;
break;
case PIXEL_FORMAT_RGB_888:
Expand Down Expand Up @@ -158,7 +158,7 @@ static void stm32_ltdc_get_capabilities(const struct device *dev,
data->hltdc.LayerCfg[0].WindowY0;
capabilities->supported_pixel_formats = PIXEL_FORMAT_ARGB_8888 |
PIXEL_FORMAT_RGB_888 |
PIXEL_FORMAT_RGB_565;
PIXEL_FORMAT_BGR_565;
capabilities->screen_info = 0;

capabilities->current_pixel_format = data->current_pixel_format;
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