[嵌入式]STM32F407模拟U盘

一、参考地址

1. https://blog.csdn.net/zhang062061/article/details/113574236
2. https://blog.csdn.net/borli/article/details/107883738
3. 解决U盘和FAtfs冲突https://www.freesion.com/article/97801199225/

二、CUBE配置

1. SDIO的配置参考我的文章STM32F407+cubeMX+Freertos+SDIO+Fatfs使用SD卡

2. USB_OTG_FS
   

3. USB_DEVICE
   

4. 最主要，时钟必须48M，我这里采用CUBE的自动设置，如果时钟不对，它会弹出是否自动设置时钟的选项
   

三、代码修改

1. usbd_storage_if.c中的修改

   extern SD_HandleTypeDef    hsd;
   
   int8_t STORAGE_GetCapacity_FS(uint8_t lun, uint32_t *block_num, uint16_t *block_size)
   {
     /* USER CODE BEGIN 3 */
     *block_num  = hsd.SdCard.BlockNbr ;
      *block_size = hsd.SdCard.BlockSize ;
     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_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 ;
     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 ;
       return (USBD_OK);
     /* USER CODE END 7 */
   }
   

2. usbd_conf.c 的 HAL_PCD_SOFCallback 可以知道是否插入了USB 或者可以参考上面的

   void HAL_PCD_SOFCallback(PCD_HandleTypeDef *hpcd)
   #endif /* USE_HAL_PCD_REGISTER_CALLBACKS */
   {
     USBD_LL_SOF((USBD_HandleTypeDef*)hpcd->pData);
     ///>插入了USB 不进行操作了
   }