Draw Bitmap with "BSP_LCD_DrawBitmap" on STM32 F7

[MMett]

I'm experimenting with the LCD library on the STM32F746G-DISCO board. I wanted to display an image from a BMP file on the display. Unfortunately this never worked. I looked at several examples, and finally noticed that the function

LL_ConvertLineToARGB8888((uint32_t *)pbmp, (uint32_t *)address, width, input_color_mode) 

in the file "stm32746g_discovery_lcd.c" called does not do what it promises.

When I replace this line with :

uint8_t * sourcefile = (uint8_t *)pbmp;
uint8_t * targetlocation = (uint8_t*)(address);
for(uint32_t i = 0; i<width; i++){
    	targetlocation[i*4+0] = sourcefile[i*4+1];
    	targetlocation[i*4+1] = sourcefile[i*4+2];
    	targetlocation[i*4+2] = sourcefile[i*4+3];
    	targetlocation[i*4+3] = sourcefile[i*4+0];
 }

the BMP display works. Only it won't be so efficient, I guess. How do I make the function "LL_ConvertLineToARGB8888" work? I see it works with "hDma2dHandler". Is it possible that I have to initialize something special?

[Tesla DeLorean]

BMP files come in dozens of formats, with different colour depths, and colour tables.

Some years back I posted several different decoders.

BMP files, from my recollection raster from the bottom up, where as screens raster from the top down. You have to unpack a line at a time, translating from the colour mapping of the line, to that of the display.

[MMett]

Thanks for your answer. So you think it's a problem of decoding? I don't suppose the problem is there. I tried to do the same with images from examples online as well as with self-generated ones. The result was always the same. I didn't see anything. Also not in wrong colors, mirror-inverted or the like. I have the impression that the HDMA doesn't do its job. But why don't I know.