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STM32G070xx的flash分布如下图，打算将Page 63用于保存用户数据。

开始一直出现flash写入失败，从返回码来看是FLASH_FLAG_PGSERR，一直找不到原因，代码如下：

#define ADDR_USER_DATA  0x0801F800

HAL_FLASH_Unlock();
FLASH_PageErase(63);
ret = HAL_FLASH_Program(TYPEPROGRAM_DOUBLEWORD, ADDR_USER_DATA, (uint64_t)data);
HAL_FLASH_Lock();

if (ret != HAL_OK)
{
    printf("\r\nuser data save failed, ret = %u, flash err = 0x%x", ret, HAL_FLASH_GetError());
}1234567891011

后来终于在community.st找到了答案：

好了，话不多说，直接上最终的代码，亲测有效：

HAL_StatusTypeDef flash_write(uint32_t address, uint64_t data)
{
    HAL_StatusTypeDef ret = HAL_OK;

    HAL_FLASH_Unlock();
    ret = HAL_FLASH_Program(TYPEPROGRAM_DOUBLEWORD, address , data);
    HAL_FLASH_Lock();

    return ret;
}

void flash_page_erase(uint32_t page)
{
    HAL_StatusTypeDef test = HAL_FLASH_Unlock();

    test = FLASH_WaitForLastOperation(1000); //1s timeout
    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR);
    FLASH_PageErase(page);
    test = FLASH_WaitForLastOperation(1000);
    CLEAR_BIT(FLASH->CR, FLASH_CR_PER);

    HAL_FLASH_Lock();
}

    /* 调用上述两个函数即可实现flash的擦除和写入 */
    flash_page_erase(63);
    ret = flash_write(ADDR_USER_DATA, (uint32_t)u_data);
    
    /* 读取的话就简单了，直接使用地址即可 */
    uint32_t u_data1 = 0;
    u_data1 = *((uint32_t*)ADDR_USER_DATA);

flash_write每次写入的是一个uint64_t类型的数据，其最终调用的函数为：

static void FLASH_Program_DoubleWord(uint32_t Address, uint64_t Data)
{
  /* Set PG bit */
  SET_BIT(FLASH->CR, FLASH_CR_PG);

  /* Program first word */
  *(uint32_t *)Address = (uint32_t)Data;

  /* Barrier to ensure programming is performed in 2 steps, in right order
    (independently of compiler optimization behavior) */
  __ISB();

  /* Program second word */
  *(uint32_t *)(Address + 4U) = (uint32_t)(Data >> 32U);
}

该函数每调用一次，其实是写入了2个word，所以在使用时需要注意Address的递增。

转自：https://blog.csdn.net/crazy_kismet/article/details/102739562?ops_request_misc=%25257B%252522request%25255Fid%252522%25253A%252522161077474116780277069978%252522%25252C%252522scm%252522%25253A%25252220140713.130102334..%252522%25257D&request_id=161077474116780277069978&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduend~default-1-102739562.pc_search_result_hbase_insert&utm_term=stm32G070