LL_DMA2D_LayerCfgTypeDef::Alpha field

Specifies the foreground or background Alpha value. - This parameter must be a number between Min_Data = 0x00 and Max_Data = 0xFF. This parameter can be modified afterwards using unitary functions - LL_DMA2D_FGND_SetAlpha() for foreground layer, - LL_DMA2D_BGND_SetAlpha() for background layer.