STM32L431 strange assignment problem?

bigbat

STM32L431 strange assignment problem? [Copy link]

Today I am learning the internal flash assignment operation of STM32L431. The program code is as follows keil 5.28 version, HAL library STM32Cube FW_L4 V1.14.0

  uint32_t page_Error = 0;
  uint32_t NbOfPages =0;
  HAL_StatusTypeDef ret;
  ret= HAL_OK;
  NbOfPages = FLASH_BANK_SIZE/FLASH_PAGE_SIZE -1; 
  FLASH_EraseInitTypeDef EraseInitStruct;
  EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES;
  EraseInitStruct.Banks = FLASH_BANK_1;
  EraseInitStruct.Page = NbOfPages;
  EraseInitStruct.NbPages = 0x01;
	  
  HAL_FLASH_Unlock(); //
  __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPTVERR);
  page_Error = HAL_FLASH_GetError();
  if(HAL_FLASHEx_Erase(&EraseInitStruct,&page_Error) == HAL_OK)
  {
    ret=HAL_FLASH_Program(FLASH_TYPEPROGRAM_FAST,WriteAddress,num);
  }
  HAL_FLASH_Lock();
  return ret;

You can see that the EraseInitStruct; structure is an assignment operation, and the value of the debugging variable at the breakpoint is

EraseInitStruct.NbPages=0x08003BD9

Other members are normal. Look at the definition of FLASH_EraseInitTypeDef

EraseInitStruct.NbPages is an integer of uint32_t. Can anyone explain it?

bigbat

I adjusted the location of the assignment.

Found that the assigned variable is still wrong! !

This is why even an assignment statement fails to execute.

lcofjp

I feel it may be caused by optimization

bigbat

lcofjp Published on 2019-12-11 18:40 I think it may be caused by optimization

Please tell me "What is optimization"?

bigbat

Finally, I optimized the internal variables of the function to three, and found that the assignment statement was normal. But the program still cannot be executed.

freebsder

Stack overflowed

lcofjp

If it doesn’t work, try changing the compiler version, maybe it’s a compiler bug;

Optimization refers to the optimization level in the compiler settings

MikeCai

You can try adding a few more free elements to the structure, initializing the assignment or not assigning free elements, and see the simulation results. Then change the optimization level and see.