stm32f429+LTDC+SDRAM+DMA2D

Get started
1

Description

I was able to run LVGL on my board without dma2d

What MCU/Processor/Board and compiler are you using?

stm32f429

What do you want to achieve?

I want to run LVGL on my board using dma2d since some widgets are slow to load. How should I change the LCD flush callback?

What have you tried so far?

Read some codes of stm32f7 UC

Code to reproduce

The previous working project is added.

Previous project

2

Hi
AFAIK the documentation didn’t talk about dma2d yet. -not sure why! maybe @kisvegabor or @embeddedt know- So I’m not sure about it. But I think it’s better than nothing.
Anyway, I hope this file I attached can help you.

lvgl_ex_function.c (14.9 KB)

3

@Ali_Rostami Thank you for your file.
I dont understand if dma2d is to ease the buffer copy or not.
in the file you posted, there are two parts.

for(i = fill_area->y1; i <= fill_area->y2; i++) {
/Wait for the previous operation/
HAL_DMA2D_PollForTransfer(&Dma2dHandle, 100);
HAL_DMA2D_BlendingStart(&Dma2dHandle, (uint32_t) lv_color_to32(color), (uint32_t) dest_buf_ofs, (uint32_t)dest_buf_ofs, area_w, 1);
dest_buf_ofs += dest_width;
}

The other part is

err = HAL_DMA_Start_IT(&DmaHandle, (uint32_t)buf_to_flush, (uint32_t)&my_fb[y_fill_act * LV_HOR_RES + x1_flush],(x2_flush - x1_flush + 1));

The first one uses dma2d with for loop ( tone of surprise ) while the other one with dma fills the one line of buffer at once. Correct me if I am wrong.