STM32H7S78-DK pll3 periph error for lcd

[hamzatamer]

I tried the bsp example among the examples of the stm32 h7s78-dk board. I integrated it into my own code. My aim is to use the LCD screen and broadcast the camera output on it. In the first stage, I try to print any text on the screen. The BSP example code works but cannot be debugged. I also get an error about pll3 when trying to initialize lc in my own code. I have shared the reasons for the error step by step in the pictures while debugging.

[Andrew Neil]

Please see the Posting Tips for how to properly post source code - not as images:

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228 

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@hamzatamer wrote:

The BSP example code works but cannot be debugged.

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What do you mean by that?

[hamzatamer]

some stm32h7s78-dk's examples are not working, for example BSP,LTDC_Display_2Layers,LTDC_ColorKeying. Error is in common.

if ((RCC->PLLCKSELR & RCC_PLLCKSELR_PLLSRC) != pllsrc)
{
/* There is another PLL activated with another source */
return HAL_ERROR;
}

this area returns HAL_ERROR i dont know why it is example code. I don't change anything. I open the code from the examples section and debug it. and it gets stuck at the HSI section. I get this error on samples that include LCD screens

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL1.PLLState = RCC_PLL_NONE;
  RCC_OscInitStruct.PLL2.PLLState = RCC_PLL_NONE;
  RCC_OscInitStruct.PLL3.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL3.PLLSource = RCC_PLLSOURCE_HSI;

  RCC_OscInitStruct.PLL3.PLLM = 4;
  RCC_OscInitStruct.PLL3.PLLN = 25;
  RCC_OscInitStruct.PLL3.PLLP = 2;
  RCC_OscInitStruct.PLL3.PLLQ = 20;
  RCC_OscInitStruct.PLL3.PLLR = 16;
  RCC_OscInitStruct.PLL3.PLLS = 2;
  RCC_OscInitStruct.PLL3.PLLT = 2;
  RCC_OscInitStruct.PLL3.PLLFractional = 0;

  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
   /* Initialization error */
   while(1);
  }
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_LTDC;
  PeriphClkInit.LtdcClockSelection   = RCC_LTDCCLKSOURCE_PLL3R;

[hamzatamer · Accepted solution]

here is to solution, if you want to run examples first you have to configure debug and startup settings. if you use stm32h7s78-dk or similar card you should keep in mind that it is a card with an external loader. First, add external loader in debug settings, after that, If you do not have a boot project, add the BOOT_XIP.hex file to the startup under the binary folder in the Templates folder and move the following line, i.e. move down also uncheck load symbols