what's the meaning of the LTDC config item, like Alpha, Alpha0?

[Junde]

Hi all,

I am trying to config the LTDC, after config and generating the code by cubeMx, I see some config like the below:

 

 

 pLayerCfg.Alpha = 0;
 pLayerCfg.Alpha0 = 0;
 pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_CA;
 pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_CA;

 

 

My config is the same as below:

And I have tried to change some items for exploring as below:

I can easily understand that L1_Alpha controls the transparency of Layer1, but others seems not clear.

I am confused about what these items mean. Can some document introduce me to how to calculate the RGB result?

Thanks a lot.

[mƎALLEm]

Hello,

You can refer to this AN4861 "Introduction to LCD-TFT display controller (LTDC) on STM32 MCUs"

[Junde]

Thanks for your help @mƎALLEm 

Now I got that the 'Alpha0' is a parameter for the background color, it means the 'A' of 'ARGB'.