使用 HAL 在 STM32f407 发现中将数据存储读/写到闪存中

Question

我正在尝试将数据存储在闪存（非易失性存储器）中以供进一步检索。这样当电源关闭再打开时，我就可以从内存中读取数据。

uint32_t address = 0x0800C000;
uint64_t data = 0x01;
HAL_FLASH_Unlock();
HAL_FLASH_Program(TYPEPROGRAM_WORD, address, data);
HAL_FLASH_Lock();

但是我无法将数据存储在这个位置，我不知道为什么？是否有任何函数可以从 HAL 中的这个位置读回数据？？

Answer 1

你必须先擦除Flash，然后才能写入新数据

/*
* write data to internal flash
* return: value if OK, 0 if Error
*/
uint32_t WriteToFlash(uint32_t address, uint32_t value)
{
    uint32_t PAGEError = 0;
    uint32_t result = 0;

    /* Unlock the Flash to enable the flash control register access *************/
    HAL_FLASH_Unlock();

    /* Erase the user Flash area */
    EraseInitStruct.TypeErase   = FLASH_TYPEERASE_PAGES;
    EraseInitStruct.PageAddress = FLASH_USER_START_ADDR; //User defined addr
    EraseInitStruct.NbPages     = 1;

    if (HAL_FLASHEx_Erase(&EraseInitStruct, &PAGEError) != HAL_OK)
    {
        HAL_FLASH_Lock();
        return 0;
    }

    /* Program the user Flash area word by word */
    if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address, value) != HAL_OK)
    {
        HAL_FLASH_Lock();
        return 0;
    }

    /* Lock the Flash to disable the flash control register access (recommended
     to protect the FLASH memory against possible unwanted operation) *********/
    HAL_FLASH_Lock();

    /* Check if the programmed data is OK */
    result = *(__IO uint32_t *)address;

    if(result != value)
        return 0;

    return result;
}