Garbage in framebuffer

[EHay.1]

Good afternoon to everyone!

I have some problem with flushing or rendering.

My settings:

• partitial framebuffer, 4 bloks, 16bpp, 32000 block size;
• internal RAM for framebuffer;
• use DMA2D and DMA2 for FMC (STM32F469);

Problem - after start UI if we press "Reset" UI button, release image button is corrupted. I am check bitmap and bitmap in framebuffer - they very difference. Result in pic.

After two click this corruption disappears. But similar problem in swap container(upper text label "LFP1") never disappears.

Thank you in advance!

[EHay.1]

I am add code in function transmitFrameBufferBlock delay before start DMA for FMC:

void transmitFrameBufferBlock(uint8_t* pixels, uint16_t x, uint16_t y, uint16_t w, uint16_t h)
{
        _isTransmittingData = 1;
	uint32_t _data_length = w * h;
        for(uint32_t i = 0; i < 21300; i++)
        {
            asm("nop");
        }
 
        SSD1963_Set_Work_Area(x, y, w, h);
        HAL_DMA_Start_IT(&hdma_memtomem_dma2_stream0, (uint32_t)pixels, FMC_DATA_ADR, _data_length);
}

Garbage is disappear but flushing very slow. This method is wrong.

[Alexandre RENOUX]

Hello,

Do you store your images in an external Flash ? If so, try to put them into internal Flash and see if you have still the problem. If you don't, this probably means your external Flash is incorrectly configured.

/Alexandre

[EHay.1]

Thank for your answer. I do not use external flash. Image storage placed in internal flash.

[EHay.1]

Hello everyone!

I find out that framebuffer allocator working with issues. If we use 4 bloks, counter sendingBlock or drawingBlock lags and we draw another blocks. TouchGFX engine marks another block. markBlockReadyForTransfer() we call in flush method. How fix it?

[Alexandre RENOUX]

Hello,

Sorry but could you please add more information ? You are using an F469 MCU right ? Is your board a custom board ? Do you confirm using TouchGFX 4.15 ?

Can you illustrate the issue with images and/or pieces of code to make it clearer ?

Have you tried using 3 blocks ? Have you tried changing the size of the blocks ?

/Alexandre