STM32H747 LCD display issue

[BTurc.2]

When I flash some .bin the LCD doesen't work. It just display the a noise picture. With similar examples does work and with more advanced examples like the EmbeddedWizard it works too.

When does not work, every time display the same static image:

[Tesla DeLorean]

Not sure what you're looking for here.

F​ocus on what the apps that are working are doing correctly and differently with the screen setup and painting, vs the apps that fail to do so.

D​ebug and analyze, and then explain more clearly the situation so there's some chance of getting support or assistance.

P​erhaps you work with other members of your team with different or broader experience.

[BTurc.2]

The problem is that I use demonstration codes for the STM32H747 that have to display something on the LCD screen. I think that the problem is in the initialization of the screen.

The code that work initialize the screen like that:

void LCD_LayertInit(uint16_t LayerIndex, uint32_t Address)

{

 LTDC_LayerCfgTypeDef layercfg;

 /* Layer Init */

 layercfg.WindowX0 = 0;

 layercfg.WindowX1 = Lcd_Ctx[0].XSize/2;

 layercfg.WindowY0 = 0;

 layercfg.WindowY1 = Lcd_Ctx[0].YSize; 

 layercfg.PixelFormat = LTDC_PIXEL_FORMAT_ARGB8888;

 layercfg.FBStartAdress = Address;

 layercfg.Alpha = 255;

 layercfg.Alpha0 = 0;

 layercfg.Backcolor.Blue = 0;

 layercfg.Backcolor.Green = 0;

 layercfg.Backcolor.Red = 0;

 layercfg.BlendingFactor1 = LTDC_BLENDING_FACTOR1_PAxCA;

 layercfg.BlendingFactor2 = LTDC_BLENDING_FACTOR2_PAxCA;

 layercfg.ImageWidth = Lcd_Ctx[0].XSize/2;

 layercfg.ImageHeight = Lcd_Ctx[0].YSize;

 HAL_LTDC_ConfigLayer(&hlcd_ltdc, &layercfg, LayerIndex); 

}

The code that show the noisy screen is:

int32_t BSP_LCD_Init(uint32_t Instance, uint32_t Orientation)

{

 return BSP_LCD_InitEx(Instance, Orientation, LCD_PIXEL_FORMAT_RGB888, LCD_DEFAULT_WIDTH, LCD_DEFAULT_HEIGHT);

}

Both codes are made for the for the same DISCOVERY. I have 2 of them and it doesen't work on any of them. I have tried to upload .bin files and it does the same.

I can't find the solution anywhere so I think that it happens because ST changed someting on the board maybe.

[ACapo.1]

Same issue here as well, the BSP code just doesn't seem to work.

Most of the cube examples just do not work for me.

[ACapo.1]

Ok I have looked into this a bit and as far as I can see so far is that any example that uses DSI Video mode doesn't work, any that use DSI Command mode do work.

So at a guess the BSP DSI Video mode code is broken for this board.

I'm thinking maybe we have a new version of the board.

[BTurc.2]

I also think we have another version. In fact now I'm learning how to use TouchGFX and when you create a new project you have to chose the version of the board.

Anyway, I hope it works soon because I want to try the FP-AI-Vision pack that does not work because of the LCD.

[ACapo.1]

Ah that is interesting, I will install TouchGFX and have a look at what the difference is with the code.

By the way I added a GH issue here: https://github.com/STMicroelectronics/STM32CubeH7/issues/254

[BTurc.2]

Good! I hope we find a solution soon.

[Sarra.S]

Hello @BTurc.2​ 

Thank you for posting your issue!

I tried the LCD_DSI example (and other demos) and it works on STM32H747 board with D01 revision/ LCD Rev A03

which demo are you using exactly? which board revision? And which LCD revision?

[ACapo.1]

Hi Sarra, I think myself and BTUrc.2 have the same version looking at his image.

I have attached a higher res image where you can see the stickers.