STM32H7内部 FAL移植疑问

发布于 2020-02-04 20:35:41 浏览：1630 订阅该版

3 个回答

hustkema 2020-02-04

这家伙很懒，什么也没写！

大神们看看，这样写是否正确？ 参照drv_flash_f4改了以下。写入每次写32bytes，不够32bytes的填0xff

/**
 * Write data to flash.
 * @note This operation's units is word
 * @note STM32H7闪存的编程位数固定为 256 位，也就是每次写入数据必须为 8 个字（ 32 字节），
 * @note 写入首地址必须是 32 的倍数，写入数据长度必须是 32 字节的倍数
 * @note This operation must after erase. @see flash_erase.
 *
 * @param addr flash address
 * @param buf the write data buffer
 * @param size write words size
 *
 * @return result
 */
int stm32h7_flash_write(rt_uint32_t addr, const rt_uint8_t *buf, size_t size)
{
    rt_err_t result      = RT_EOK;
    rt_uint32_t end_addr = addr + size;
    size_t size_padding = 0;
    if(addr<FLASH_BANK1_BASE||addr%32!=0)
    {
        LOG_E("flash writing address must be multiple of 32");
        return -RT_EINVAL;
    }
    if(end_addr%32!=0)
    {
        rt_uint32_t end_addr_temp = (rt_uint32_t)((end_addr/32)+1)*32;
        size_padding = end_addr_temp - end_addr;
        end_addr = end_addr_temp;
    }
    if ((end_addr) > STM32_FLASH_END_ADDRESS)
    {
        LOG_E("write outrange flash size! addr is (0x%p)", (void *)(end_addr));
        return -RT_EINVAL;
    }
    if (size < 1)
    {
        return -RT_EINVAL;
    }
    /* Unlock the Flash to enable the flash control register access */
    HAL_FLASH_Unlock();
    //__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | FLASH_FLAG_PGPERR);
    //处理数据(不包括最后32BYTES)
    for (size_t i = 0; i < size/32-1; i++)
    {
        /* write data to flash */
        if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_FLASHWORD, addr, (uint32_t)(buf)) == HAL_OK)
        {
            if (*(__IO rt_uint32_t*)addr != *buf)
            {
                result = -RT_ERROR;
                break;
            }
            addr += 32;
            buf += 32;
        }
        else
        {
            result = -RT_ERROR;
            break;
        }
    }
    //处理最后32BYTES数据,padding部分填0
    rt_uint8_t last_buf[32] = {0xFF};
    rt_memcpy(last_buf, buf, 32-size_padding);
    if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_FLASHWORD, addr, (uint32_t)(last_buf)) == HAL_OK)
    {
        if (*(__IO rt_uint32_t*)addr != *last_buf)
        {
            result = -RT_ERROR;
        }
    }
    else
    {
        result = -RT_ERROR;
    }
    HAL_FLASH_Lock();
    if (result != RT_EOK)
    {
        return result;
    }
    return size;
}