How to Find a guide about gpu_fill_cb

v_w · July 28, 2019, 10:41am

I managed to make it fast

embeddedt · July 28, 2019, 2:32pm

That’s… odd. No one has ever had an issue with that before. Maybe the system doesn’t want you posting too often too quickly. I made a small change to the settings on your account; can you try again?

Good to hear!

AhmadBan · July 28, 2019, 5:49pm

this is a video
I just wrote a program that take each pixel and if it was the same color with previous pixel stick it to that and make a line with single color then I send a single fillrect command to LCD
last.zip (1.4 MB)

AhmadBan · August 2, 2019, 7:20pm

I could make some built in GPU implementation but I think I can add a MEM2MEM DMA in my hardware to make it faster. please if there is a document abut GPU_FILL_CB and GPU_BLEND_CB arguments share it here I read some of code but they are vague to me.
do i have to implement both callback?

kisvegabor · August 4, 2019, 5:19pm

Have you checked these example functions?
https://github.com/littlevgl/lvgl/blob/master/porting/lv_port_disp_template.c#L172-L187

Or the implementations in other STM projects:

github.com

lvgl/lv_port_stm32f429_disco/blob/master/hal_stm_lvgl/tft/tft.c#L225-L255


      
          /* Vertical synchronization height = Vsync - 1 */
          LtdcHandle.Init.VerticalSync = 1;
          /* Accumulated horizontal back porch = Hsync + HBP - 1 */
          LtdcHandle.Init.AccumulatedHBP = 29;
          /* Accumulated vertical back porch = Vsync + VBP - 1 */
          LtdcHandle.Init.AccumulatedVBP = 3;
          /* Accumulated active width = Hsync + HBP + Active Width - 1 */
          LtdcHandle.Init.AccumulatedActiveW = 269;
          /* Accumulated active height = Vsync + VBP + Active Heigh - 1 */
          LtdcHandle.Init.AccumulatedActiveH = 323;
          /* Total width = Hsync + HBP + Active Width + HFP - 1 */
          LtdcHandle.Init.TotalWidth = 279;
          /* Total height = Vsync + VBP + Active Heigh + VFP - 1 */
          LtdcHandle.Init.TotalHeigh = 327;
          
          /* Configure R,G,B component values for LCD background color */
          LtdcHandle.Init.Backcolor.Blue = 0;
          LtdcHandle.Init.Backcolor.Green = 0;
          LtdcHandle.Init.Backcolor.Red = 0;

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No, only one of them is fine too.

Ulric_Denis · August 7, 2019, 10:31pm

Hi, to accelerate the screen display i use this for the Hx8347G.

/* Display flushing */
void my_disp_flush(lv_disp_drv_t *disp, const lv_area_t *area, lv_color_t *color_p)
{
  static uint16_t temp[32];
  uint16_t c,old_c;
  int i=0;
  tft.startWrite(); /* Start new TFT transaction */
  tft.setAddrWindow(area->x1, area->y1, (area->x2 - area->x1 + 1), (area->y2 - area->y1 + 1)); /* set the working window */
  tft.writeCommand(0x22);
  for (int y = area->y1; y <= area->y2; y++) {
    for (int x = area->x1; x <= area->x2; x++) {
       temp[i] = color_p->full;
       i++;
       if (i==32){   
       tft.writePixels(temp, i);
       i = 0;
       }
      color_p++;
    }
  }
  tft.endWrite(); /* terminate TFT transaction */
  lv_disp_flush_ready(disp); /* tell lvgl that flushing is done */
}

in this display can upload until 32 pixel at same time by SPI now the screen start instanly.

Ulric_Denis · August 7, 2019, 11:14pm

i forgot to say i use an ESP32