Hello ST team,
I have a project using STM32F767ZG with LTDC for LCM (LCD module).
Currently, I encounter an issue for display picture on LCM.
Could you help me to figure out this issue?
In my HW design, use LTDC R[2:7] , G[2:7] and B[2:7] for LCM.
I generated a pure blue (B = 0xFF) picture as below table for ST boot screen.
pLayerCfg.FBStartAdress = (uint32_t *)image_data_sample_320_480_blue;
(See sample_320_480_blue.h)
However, with above table, I saw RGB888 and RGB656 (just see different) both display not well.
For further check on RGB888 case, I should only see signal running on LTDC B[2:7] pins
supposedly. But, after check each PINs (R[2:7] , G[2:7] and B[2:7]), I saw all RGB signal running on LTDC interface.
And, here is my LTDC init code.
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_AH;
hltdc.Init.PCPolarity = LTDC_PCPOLARITY_IPC;
hltdc.Init.HorizontalSync = 49;
hltdc.Init.VerticalSync = 3;
hltdc.Init.AccumulatedHBP = 99;
hltdc.Init.AccumulatedVBP = 7;
hltdc.Init.AccumulatedActiveW = 419;
hltdc.Init.AccumulatedActiveH = 487;
hltdc.Init.TotalWidth = 457;
hltdc.Init.TotalHeigh = 495;
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 = 320;
pLayerCfg.WindowY0 = 0;
pLayerCfg.WindowY1 = 480;
pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB888;
pLayerCfg.Alpha = 255;
pLayerCfg.Alpha0 = 0;
pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;
pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_PAxCA;
pLayerCfg.FBStartAdress = (uint32_t *)image_data_sample_320_480_blue;
pLayerCfg.ImageWidth = 320;
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();
}
Thanks,
Jim
