hello , T。T
I’m developing a GUI using TouchGFX on the STM32F469I-DISCO board.
In the handleTickEvent() function, I add 5 points to a dynamic data graph each time it is called. However, when doing this, the frequency of handleTickEvent() drops significantly, and the display performance becomes very poor.
In comparison, an older project based on the demo uses MIPI DSI in command mode and configures LTDC as 480×200×4, and it performs noticeably better than my current setup where LTDC is configured as 480×800 and DSI is set to video mode.
The scan is 480 * 800 .
static void MX_LTDC_Init(void)
{
/* USER CODE BEGIN LTDC_Init 0 */
/* USER CODE END LTDC_Init 0 */
LTDC_LayerCfgTypeDef pLayerCfg = {0};
/* USER CODE BEGIN LTDC_Init 1 */
/* USER CODE END LTDC_Init 1 */
hltdc.Instance = LTDC;
hltdc.Init.HSPolarity = LTDC_HSPOLARITY_AH;
hltdc.Init.VSPolarity = LTDC_VSPOLARITY_AH;
hltdc.Init.DEPolarity = LTDC_DEPOLARITY_AL;
hltdc.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
hltdc.Init.HorizontalSync = 1;
hltdc.Init.VerticalSync = 1;
hltdc.Init.AccumulatedHBP = 2;
hltdc.Init.AccumulatedVBP = 2;
hltdc.Init.AccumulatedActiveW = 202;
hltdc.Init.AccumulatedActiveH = 482;
hltdc.Init.TotalWidth = 203;
hltdc.Init.TotalHeigh = 483;
hltdc.Init.Backcolor.Blue = 0;
hltdc.Init.Backcolor.Green = 0;
hltdc.Init.Backcolor.Red = 0;
if (HAL_LTDC_Init(&hltdc) != HAL_OK)
{
Error_Handler();
}
pLayerCfg.WindowX0 = 0;
pLayerCfg.WindowX1 = 200;
pLayerCfg.WindowY0 = 0;
pLayerCfg.WindowY1 = 480;
pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB565;
pLayerCfg.Alpha = 255;
pLayerCfg.Alpha0 = 0;
pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_CA;
pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_CA;
pLayerCfg.FBStartAdress = 0xC0000000;
pLayerCfg.ImageWidth = 200;
pLayerCfg.ImageHeight = 480;
pLayerCfg.Backcolor.Blue = 0;
pLayerCfg.Backcolor.Green = 0;
pLayerCfg.Backcolor.Red = 0;
if (HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN LTDC_Init 2 */
__HAL_LTDC_DISABLE(&hltdc);
DSI_LPCmdTypeDef LPCmd;
HAL_DSI_Start(&hdsi);
NT35510_Init(NT35510_FORMAT_RBG565, LCD_ORIENTATION_LANDSCAPE);
HAL_DSI_ShortWrite(&hdsi, 0, DSI_DCS_SHORT_PKT_WRITE_P1, NT35510_CMD_DISPOFF, 0x00);
LPCmd.LPGenShortWriteNoP = DSI_LP_GSW0P_DISABLE;
LPCmd.LPGenShortWriteOneP = DSI_LP_GSW1P_DISABLE;
LPCmd.LPGenShortWriteTwoP = DSI_LP_GSW2P_DISABLE;
LPCmd.LPGenShortReadNoP = DSI_LP_GSR0P_DISABLE;
LPCmd.LPGenShortReadOneP = DSI_LP_GSR1P_DISABLE;
LPCmd.LPGenShortReadTwoP = DSI_LP_GSR2P_DISABLE;
LPCmd.LPGenLongWrite = DSI_LP_GLW_DISABLE;
LPCmd.LPDcsShortWriteNoP = DSI_LP_DSW0P_DISABLE;
LPCmd.LPDcsShortWriteOneP = DSI_LP_DSW1P_DISABLE;
LPCmd.LPDcsShortReadNoP = DSI_LP_DSR0P_DISABLE;
LPCmd.LPDcsLongWrite = DSI_LP_DLW_DISABLE;
HAL_DSI_ConfigCommand(&hdsi, &LPCmd);
HAL_LTDC_SetPitch(&hltdc, 800, 0);
__HAL_LTDC_ENABLE(&hltdc);
/* USER CODE END LTDC_Init 2 */
}
this is the comparison I’ve observed.
1. How can I improve the performance of my graph display?
2. Why is the example project configured this way for LTDC? What are the advantages? Why is its configuration different from what's stated in the datasheet?
3. If I use video mode, will this kind of configuration provide any optimization?
