STM32 HAL USB SD卡读卡器usbd_storage_if.c文件的坑

首先推荐和对应搬运的

int8_t STORAGE_Init_FS(uint8_t lun)
{
          
   
  /* USER CODE BEGIN 2 */
  return (USBD_OK);
  /* USER CODE END 2 */
}

//若这里使用hsd.SdCard.BlockSize的话，有些卡BlockSize为1024byte，会造成设备管理器显示无法迁移设备
int8_t STORAGE_GetCapacity_FS(uint8_t lun, uint32_t *block_num, uint16_t *block_size)
{
          
   
  /* USER CODE BEGIN 3 */
  *block_num  = hsd.SdCard.LogBlockNbr-1;//逻辑块数量
  *block_size = hsd.SdCard.LogBlockSize;//注意这里要用逻辑块大小
  return (USBD_OK);
  /* USER CODE END 3 */
}

int8_t STORAGE_IsReady_FS(uint8_t lun)
{
          
   
  /* USER CODE BEGIN 4 */
	uint8_t state = 0;
	state = HAL_SD_GetState(&hsd) ;
	if(HAL_SD_STATE_READY != state)
	    return (USBD_FAIL) ;
	return (USBD_OK);
  /* USER CODE END 4 */
}

int8_t STORAGE_IsWriteProtected_FS(uint8_t lun)
{
          
   
  /* USER CODE BEGIN 5 */
  return (USBD_OK);
  /* USER CODE END 5 */
}

int8_t STORAGE_Read_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
          
   
  /* USER CODE BEGIN 6 */
  if(HAL_OK != HAL_SD_ReadBlocks(&hsd, (uint8_t *)buf, blk_addr, blk_len, 1000)){
          
   
	  return (USBD_FAIL);
  }
    //注意这里必须阻塞等待传输完成
    //或者下次传输之前必须等待传输完成才开始传输
    //不然会造成USB向SD卡写入稍大的文件就会出错
  while (HAL_SD_GetCardState(&hsd) != HAL_SD_CARD_TRANSFER);
  return (USBD_OK);
  /* USER CODE END 6 */
}

int8_t STORAGE_Write_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
          
   
  /* USER CODE BEGIN 7 */
  if(HAL_OK != HAL_SD_WriteBlocks(&hsd, (uint8_t *)buf, blk_addr, blk_len, 1000)){
          
   
      return (USBD_FAIL);
  }
  //同上也需等待
  while (HAL_SD_GetCardState(&hsd) != HAL_SD_CARD_TRANSFER){
          
   }
  return (USBD_OK);
  /* USER CODE END 7 */
}

int8_t STORAGE_GetMaxLun_FS(void)
{
          
   
  /* USER CODE BEGIN 8 */
  return (STORAGE_LUN_NBR - 1);
  /* USER CODE END 8 */
}