Stm32 dma2d fsmc lvgl

How-to
1

Hi there,

I use an STM32H743. Meanwhile, LVGL with a display (NT35510 Controller 4" 800x480) is running successfully via FSMC. Now I would like to use DMA2D. Does anyone have any tips on setting up?

Greetings Sascha

2

With newer versions of LVGL it should be as simple as enabling this option in lv_conf.h.

3

Hello,

thanks for the Tip. I’M changig it. First after compiling, the Compiler miss the core_cm7.h. After changing the Include-Path, the Program compiled without erros. But the Screen looks bad.

20210119_172423
20210119_1724234032×2268 1.95 MB

My Display Flush:

void disp_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
{
int32_t x;
int32_t y;
LCD_SetWindows(area->x1, area->y1, area->x2, area->y2);
LCD_WR_REG(0x2C00);
LCD_WR_REG(0x3C00);
for(y = area->y1; y <= area->y2; y++) {
for(x = area->x1; x <= area->x2; x++) {
/* Put a pixel to the display. For example: */

    	LCD->LCD_RAM =color_p->full;
        color_p++;
    }
}

lv_disp_flush_ready(disp_drv);

}

Regards Sascha

4

Call SCB_CleanInvalidateDCache(); before writing to the display. You need to invalidate the cache so the changes from DMA2D are reflected in the CPU.

5

By calling SCB_CleanInvalidateDCache();, the Screen stay White and blank.

6

Hello I’m in the process of creating a LVGL port for my custom board using a H7 any chance I could pick your brain on developing the driver?