stm32l071cbt6片內flash操作

今天在看片內flash的操作，發現按照下面的操作並沒有寫成功：

    unsigned long temp = 0x12345678;

    HAL_FLASH_Unlock();
    FLASH_PageErase(APPLICATION_B_ADDRESS)
    status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD,APPLICATION_B_ADDRESS,temp);
    HAL_FLASH_Lock();

HAL_StatusTypeDef HAL_FLASH_Program(uint32_t TypeProgram, uint32_t Address, uint32_t Data)
{
  HAL_StatusTypeDef status = HAL_ERROR;
  
  /* Process Locked */
  __HAL_LOCK(&pFlash);

  /* Check the parameters */
  assert_param(IS_FLASH_TYPEPROGRAM(TypeProgram));
  assert_param(IS_FLASH_PROGRAM_ADDRESS(Address));

  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  
  if(status == HAL_OK)
  {
    /* Clean the error context */
    pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;

    /*Program word (32-bit) at a specified address.*/
    *(__IO uint32_t *)Address = Data;

    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);
  }

  /* Process Unlocked */
  __HAL_UNLOCK(&pFlash);

  return status;
}

但是下面這個函數的返回值是HAL_OK的，誤導性太大了，讓我一時不知道怎么去查。

status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD,APPLICATION_B_ADDRESS,temp);

 

我花了一下午時間對着手冊寄存器去查問題，直接說結果吧：

    FLASH_EraseInitTypeDef f;
    HAL_StatusTypeDef status = HAL_OK;
    uint32_t PageError = 0;
    
    f.TypeErase = FLASH_TYPEERASE_PAGES;
    f.PageAddress = address;
    f.NbPages = page_cnt;                                
    status = HAL_FLASHEx_Erase(&f, &PageError);

erase用這個函數就沒問題了，唯一的區別就是多了兩個清除標志位的操作：

      FLASH_PageErase(address);

      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE);

      /* If the erase operation is completed, disable the ERASE Bit */
      CLEAR_BIT(FLASH->PECR, FLASH_PECR_PROG);
      CLEAR_BIT(FLASH->PECR, FLASH_PECR_ERASE);

就寫到這里吧。