LTDC color issue

[SSchw.7]

Hi,

I am faced with some color issues on a custom board (STM32H7A3). A 800x480 24 bit LCD is connected and the LTDC pixel format is RGB888. For testing is set the background color within LTDC initialisation to:

 hltdc.Init.Backcolor.Blue = 128;

 hltdc.Init.Backcolor.Green = 128;

 hltdc.Init.Backcolor.Red = 128;

i would expect grey but the screen shows light green

attached the ltdc code

any suggestion what could be wrong?

best regards

Sebastian

[MM..1]

Seems you mix or misconnect R7 G7 B7 or more. If your LCD is MIPI DSI then other ...

For RGB LCD try 127 then 63 etc. for grey test.

[SSchw.7]

Thank you for your fast response.

The interface is parallel RGB. I think you are right, some lines must be misconnected or mixed. I tried 127 and 63. I got light purple and purple. I orderd an adapter to test the data lines. I will post the result as soon as the adapter arrives.

Sebastian