Posted on January 30, 2016 at 16:52
If i'm correct then these should be the settings for the LTDC controller:
Hello Guys,
I've currently designed a board with an STM32F756IGT6. Connected to the board is an 7'' LCD from Rocktech. Same manufacturer as the 4.3'' LCD's that can be found on the stm32F7 discovery boards. I'm now trying to get the LCD to work. It's connected with a 18 bit RGB interface and i'm using the Sync connection mode. Not the DE connection. I have the display partially working because I can set background colors successful. Now I was trying to put some pixels in the screen to verify the timing is correct. I adapted the STEMWIN hello world example from the discovery board to my board and tried to show the helllo world. But all I get is some random lines. I think the timing for the back porch etc is not correct. In the datasheet of the LCD I find these parameters:
If i'm correct then these should be the settings for the LTDC controller:
void MX_LTDC_Init(void)
{
LTDC_LayerCfgTypeDef pLayerCfg;
LTDC_LayerCfgTypeDef pLayerCfg1;
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 = 1;
hltdc.Init.VerticalSync = 1;
hltdc.Init.AccumulatedHBP = 45;
hltdc.Init.AccumulatedVBP = 22;
hltdc.Init.AccumulatedActiveW = 845;
hltdc.Init.AccumulatedActiveH = 502;
hltdc.Init.TotalWidth = 1055;
hltdc.Init.TotalHeigh = 634;
hltdc.Init.Backcolor.Blue = 255;
hltdc.Init.Backcolor.Green = 0;
hltdc.Init.Backcolor.Red = 0;
HAL_LTDC_Init(&hltdc);
pLayerCfg.WindowX0 = 0;
pLayerCfg.WindowX1 = 0;
pLayerCfg.WindowY0 = 0;
pLayerCfg.WindowY1 = 0;
pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_ARGB8888;
pLayerCfg.Alpha = 0;
pLayerCfg.Alpha0 = 0;
pLayerCfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_CA;
pLayerCfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_CA;
pLayerCfg.FBStartAdress = 0;
pLayerCfg.ImageWidth = 0;
pLayerCfg.ImageHeight = 0;
pLayerCfg.Backcolor.Blue = 0;
pLayerCfg.Backcolor.Green = 0;
pLayerCfg.Backcolor.Red = 0;
HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0);
pLayerCfg1.WindowX0 = 0;
pLayerCfg1.WindowX1 = 0;
pLayerCfg1.WindowY0 = 0;
pLayerCfg1.WindowY1 = 0;
pLayerCfg1.PixelFormat = LTDC_PIXEL_FORMAT_ARGB8888;
pLayerCfg1.Alpha = 0;
pLayerCfg1.Alpha0 = 0;
pLayerCfg1.BlendingFactor1 = LTDC_BLENDING_FACTOR1_CA;
pLayerCfg1.BlendingFactor2 = LTDC_BLENDING_FACTOR2_CA;
pLayerCfg1.FBStartAdress = 0;
pLayerCfg1.ImageWidth = 0;
pLayerCfg1.ImageHeight = 0;
pLayerCfg1.Backcolor.Blue = 0;
pLayerCfg1.Backcolor.Green = 0;
pLayerCfg1.Backcolor.Red = 0;
HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg1, 1);