stm32 15-2 flash 闪存：代码部分二

zhangzhangkeji2026-10-10 13:08

（101）继续老师的库函数的讲解 ：

++ 写入字：

c 复制代码

/**
  * @brief  Programs a word at a specified address.
  * @note   This function can be used for all STM32F10x devices.
  * @param  Address: specifies the address to be programmed.
  * @param  Data: specifies the data to be programmed.
  * @retval FLASH Status: The returned value can be: FLASH_ERROR_PG,
  *         FLASH_ERROR_WRP, FLASH_COMPLETE or FLASH_TIMEOUT. 
  */
FLASH_Status FLASH_ProgramWord(uint32_t Address, uint32_t Data)
{
  FLASH_Status status = FLASH_COMPLETE;
  __IO uint32_t tmp = 0;

  /* Check the parameters */
  assert_param(IS_FLASH_ADDRESS(Address));

#ifdef STM32F10X_XL
  //................
#else
  /* Wait for last operation to be completed */
  status = FLASH_WaitForLastOperation(ProgramTimeout);
  
  if(status == FLASH_COMPLETE)
  {
    /* if the previous operation is completed, proceed to program the new first half word */
    FLASH->CR |= CR_PG_Set;
  
    *(__IO uint16_t*)Address = (uint16_t)Data;
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation(ProgramTimeout);
 
    if(status == FLASH_COMPLETE)
    {
      /* if the previous operation is completed, proceed to program the new second half word */
      tmp = Address + 2;  // 这里也可以看出， stm323 是小端法 CPU 

      *(__IO uint16_t*) tmp = Data >> 16;  // 把一个字拆分成两个半字，分两次写入 flash 
    
      /* Wait for last operation to be completed */
      status = FLASH_WaitForLastOperation(ProgramTimeout);
        
      /* Disable the PG Bit */
      FLASH->CR &= CR_PG_Reset;
    }
    else
    {
      /* Disable the PG Bit */
      FLASH->CR &= CR_PG_Reset;
    }
  }         
#endif /* STM32F10X_XL */
   
  /* Return the Program Status */
  return status;
}