SD卡手动挂载ELM文件系统出错

发布于 2021-04-06 16:39:09 浏览：1618 订阅该版

自己写了个简单的sd卡驱动 显示注册成功 也能正常读到容量什么的 然后想着挂载上文件系统 dfs和elm初始化都通过了 但是挂载的时候显示format error然后又打印了一个illegal  stdio input 这个时候控制台不能输入了
这种可能是自己的sd驱动有问题 还是我挂载的方式有问题？
![sd注册初始化.jpg](https://oss-club.rt-thread.org/uploads/20210406/01dac2b2d5410efd70218522cb9bcf59.jpg)
![11b3b7d39f0ea50c504b279c970e0ab9.jpg](https://oss-club.rt-thread.org/uploads/20210406/11b3b7d39f0ea50c504b279c970e0ab9.jpg)
```
struct rt_device my_sdcard;

rt_err_t rt_sdcard_init(rt_device_t dev)
{
	/* DMA controller clock enable */
  __HAL_RCC_DMA2_CLK_ENABLE();

/* DMA interrupt init */
  /* DMA2_Channel4_5_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA2_Channel4_5_IRQn, 1, 0);
  HAL_NVIC_EnableIRQ(DMA2_Channel4_5_IRQn);
	
  hsd.Instance 									= SDIO;
  hsd.Init.ClockEdge 						= SDIO_CLOCK_EDGE_RISING;
  hsd.Init.ClockBypass 					= SDIO_CLOCK_BYPASS_DISABLE;
  hsd.Init.ClockPowerSave 			= SDIO_CLOCK_POWER_SAVE_DISABLE;
  hsd.Init.BusWide 							= SDIO_BUS_WIDE_1B;
  hsd.Init.HardwareFlowControl 	= SDIO_HARDWARE_FLOW_CONTROL_ENABLE;
  hsd.Init.ClockDiv 						= SDIO_TRANSFER_CLK_DIV;
	
  if (HAL_SD_Init(&hsd) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_SD_ConfigWideBusOperation(&hsd, SDIO_BUS_WIDE_4B) != HAL_OK)
  {
    Error_Handler();
  }		
	
	return RT_EOK;
}

rt_err_t rt_sdcard_open(rt_device_t dev, rt_uint16_t oflag)
{
	return rt_sdcard_init(dev);
}

rt_size_t rt_sdcard_read(rt_device_t dev, rt_off_t sector, void *buffer,  rt_size_t size)
{
	rt_base_t level = 0, status = 0, timeout = 0xff;
	level = rt_hw_interrupt_disable();
	
	status = HAL_SD_ReadBlocks_DMA(&hsd, buffer, sector, size);

while(HAL_SD_GetCardState(&hsd) != HAL_SD_CARD_TRANSFER)
	{
		if(timeout-- == 0)
		{
			status = RT_ERROR;
			
			rt_hw_interrupt_enable(level);
			return status;
		}
	}
	
	rt_hw_interrupt_enable(level);
	
	return RT_EOK;
}

rt_size_t rt_sdcard_write(rt_device_t dev, rt_off_t sector, const void *buffer,  rt_size_t size)
{
	rt_base_t level = 0, status = 0, timeout = 0xff;
	level = rt_hw_interrupt_disable();

status = HAL_SD_WriteBlocks_IT(&hsd, (uint8_t *)buffer, sector, size);

void rt_hw_sdcard_init(void)
{
	my_sdcard.type = RT_Device_Class_Block;
	
	my_sdcard.init 			= rt_sdcard_init;
	my_sdcard.open 			= rt_sdcard_open;
	my_sdcard.read 			= rt_sdcard_read;
	my_sdcard.write 		= rt_sdcard_write;

rt_device_register(&my_sdcard, "sd0",
										 RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE | RT_DEVICE_FLAG_DMA_RX);
	
	rt_device_open(&my_sdcard, RT_DEVICE_FLAG_RDWR);
}
INIT_APP_EXPORT(rt_hw_sdcard_init);
```