Configuration DMA2D pixel format conversion with blending

[kulfi27]

Hello, I have a problem with the configuration of the DMA2D peripheral, namely after decoding the JPG image I change the BMP format to RGB565 it works without a problem, now on the picture I would like to display the icon and here I have a problem whether the photo should be configured as background and icon as foregrund and what input format should be icons. Regards

[turboscrew]

"On the picture" implies that the picture is background. The icon format depends on the way you handle them. I would probably use alpha-masks and draw them in "color layers" - that makes changes in coloring easier - like when an icon is clicked, its borders could change. That just tends to take more space.

[kulfi27]

Hello, I still haven't been able to properly start DMA2D, below the photo and configuration, maybe someone will be able to show me where I am making a mistake.

	          DMA2D->CR         = DMA2D_CR_MODE_1;                     // Mem to Mem with Blending
	          DMA2D->OPFCCR     = DMA2D_OPFCCR_CM_1;                   // out format RGB565
	          DMA2D->FGPFCCR    = 0xff000000|DMA2D_FGPFCCR_CM_1;       // foreg. in format RGB565
	        //  DMA2D->FGCOLR     = 0x00050605;                        // color register foregrund 565
	          DMA2D->FGOR       = 0x00000000;                          // ofset  foregrund
	          DMA2D->OOR        = 0x0000017c;                          // output ofset 380
	          DMA2D->NLR        = 0x00640064;                          // size of ikons 100*100
	          DMA2D->OMAR       = (uint32_t )(LCD_FRAME_BUFFER+45300); // out buf plus ofset
	          DMA2D->FGMAR      = (uint32_t )(ikon);                   // in ikon foregrund
 
	          DMA2D->BGMAR      = (uint32_t )LCD_FRAME_BUFFER;         // in picture backgrund
	        //  DMA2D->BGOR       =  0x000000ff;
	          DMA2D->BGPFCCR    = 0xff000000|DMA2D_BGPFCCR_CM_1;       // backg. in format RGB565
	       //   DMA2D->BGCOLR     = 0x00050605;                        // color register backgrund 565
	        //  DMA2D->OOR        =  0x000000ff;
 
	          DMA2D->CR        |= DMA2D_CR_START;
 
	          tft_cls(BLACK);
 
	          tft_bitmap(0,0,(uint16_t*)LCD_FRAME_BUFFER,480,272);