STM32H743 LTDC Problem

[Sany]

Hey,

I have a confusing error, i have a Riverdi 7" TFT Panel (https://download.riverdi.com/RVT70HSTNWC00-B/DS_RVT70HSTNWC00-B_Rev.1.2.pdf)

Actually my LTDC Init is this:

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_AL;
  hltdc.Init.VSPolarity = LTDC_VSPOLARITY_AL;
  hltdc.Init.DEPolarity = LTDC_DEPOLARITY_AL;
  hltdc.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
  hltdc.Init.HorizontalSync = 0;
  hltdc.Init.VerticalSync = 0;
  hltdc.Init.AccumulatedHBP = 160;
  hltdc.Init.AccumulatedVBP = 23;
  hltdc.Init.AccumulatedActiveW = 1184;
  hltdc.Init.AccumulatedActiveH = 623;
  hltdc.Init.TotalWidth = 1344;
  hltdc.Init.TotalHeigh = 635;
  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 = 1024;
  pLayerCfg.WindowY0 = 0;
  pLayerCfg.WindowY1 = 600;
  pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB888;
  pLayerCfg.Alpha = 255;
  pLayerCfg.Alpha0 = 255;
  pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_CA;
  pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_CA;
  pLayerCfg.FBStartAdress = 0xC0000000;
  pLayerCfg.ImageWidth = 1024;
  pLayerCfg.ImageHeight = 600;
  pLayerCfg.Backcolor.Blue = 255;
  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 */

  /* USER CODE END LTDC_Init 2 */

}

the Layer0 background is set to blue, if my WindowsX1 = 1024, my background shows no blue screen, but only gray..
if i decrease WindowX1 to 500, then my screen is half blue, if i change WindowsX1 to 0 then my Screen are complete blue..

whats wrong? my LCD is in 18-Bit mode (RGB666) and V/HSync and the DCLK of the display is 50 MHZ, Pixel Format is set to RGB888.

my external sdram works fine, here is the test result:

 -------------------- SDRAM 16 bit access -------------------
Write 16-bit data , size: 32 MB, elapsed time: 825 ms, write speed: 38.79 MB/s
Read 16-bit data, size: 32 MB, elapsed time: 3161 ms, read speed: 10.12 MB/s
 -------------------- 16 Bit data validation  -------------------
SDRAM 16-bit data validation pass!