STM32F746 + 5.0�? TFT + TouchGFX on custom board

[SKokk.1]

Hello,

I am building a custom board based on the STM32F746's discovery.

I have already used the STM32CubeIDE 1.1.0 with TouchGFX 4.12.3 om discovery and everything is working fine.

Custom board has the same hardware with discovery but we are using different TFT screen (attached PDF).

The TFT on my board displays:

I am not sure about the LTDC parameters based on the new TFT. I have set the below:

void MX_LCD_Init(void) 
{ 
 LTDC_LayerCfgTypeDef pLayerCfg;
 
/* De-Initialize LTDC */
  HAL_LTDC_DeInit(&hltdc);
/* Configure LTDC */
 
  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 = 49;
  hltdc.Init.VerticalSync = 4;
  hltdc.Init.AccumulatedHBP = 89;
  hltdc.Init.AccumulatedVBP = 33;
  hltdc.Init.AccumulatedActiveW = 889;
  hltdc.Init.AccumulatedActiveH = 513;
  hltdc.Init.TotalWidth = 929;
  hltdc.Init.TotalHeigh = 526;
  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 = 800;
  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 = 0xC0000000;
  pLayerCfg.ImageWidth = 480;
  pLayerCfg.ImageHeight = 272;
  pLayerCfg.Backcolor.Blue = 0;
  pLayerCfg.Backcolor.Green = 0;
  pLayerCfg.Backcolor.Red = 0;
  if (HAL_LTDC_ConfigLayer(&hltdc, &pLayerCfg, 0) != HAL_OK)
  {
    Error_Handler( );
  }
 
 HAL_LTDC_SetPitch(&hltdc, 800, 0);
 
}

Could someone help me or advise?

[Tesla DeLorean]

void MX_LCD_Init(void) 
{ 
 LTDC_LayerCfgTypeDef pLayerCfg;
 
/* De-Initialize LTDC */
  HAL_LTDC_DeInit(&hltdc);
/* Configure LTDC */
 
  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 = 47;
  hltdc.Init.AccumulatedHBP = 87;
  hltdc.Init.AccumulatedActiveW = 887;
  hltdc.Init.TotalWidth = 927;
 
  hltdc.Init.VerticalSync = 2;
  hltdc.Init.AccumulatedVBP = 31;
  hltdc.Init.AccumulatedActiveH = 511;
  hltdc.Init.TotalHeigh = 524;
 
  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 = 800;
  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 = 0xC0000000;
  pLayerCfg.ImageWidth = 800;
  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( );
  }
}

[Karan 123]

Hi,

I have not seen your datasheet​

But If your schematic/connections is correct

Did you compare the paramters of both the TFT/LCD ​such as VSYNC, HSYNC, Vertical Porch Horizontal Portch etc.? as in program.

Also you can put scope on DE, VSYNC, HSYNC,Reset pin​ etc of TFT?

​Check your TFT Works with DE/Sync check both Datasheets? For code compatibility.

Hope this helps... ​

--

Karan​

[SKokk.1]

Thank you for your answers.

I fixed the parameters but still problem. Then i changed the Pixel format to:

pLayerCfg.PixelFormat = LTDC_PIXEL_FORMAT_RGB565;

And it worked.

On TouchGFX project the Pixel format is "locked" to 16bit. Is there a way to change it to 24bit or i should create new TouchGFX project?

[Karan 123]

Hi

Just Create new Touchgfx project and ​then try...

--

Karan​

[Tesla DeLorean]

That does look a lot better...

[SKokk.1]

Worked with RGB888 setup too, thank you guys.

[Karan 123]

Great!!!

[SKokk.1]

Something else,

why does simulation and real hardware application is different?

I run simulation on TouchGFX designer and everything is good (using some animated pictures from examples) but when i load on hardware, animations seems not working.

https://www.youtube.com/watch?v=e0laQf_d6l8

[Martin KJELDSEN]

Seems like maybe your application is not being ticked - Can you break inside Model::tick() and check ? The tick is what drives the application including the animated images.