STM32F407 tf卡通过usb访问删除文件后如何更新tf卡容量信息

antoinezhuzhu · 发表于 2024-7-24 16:41:43

STM32F407 挂载了TF卡，开了 fatfs  也连接成为了usb massive storage设备

底层读写都能正常更新剩余容量

但是usb删加文件后剩余容量不更新

获取容量用的是f_getfree

然后usb这边代码如下

int8_t STORAGE_Read_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
  int8_t ret = USBD_FAIL;
  if( HAL_SD_ReadBlocks_DMA(&hsd, buf, blk_addr, blk_len) == HAL_OK )  { ret = USBD_OK; }

  if( USBD_OK == ret )
  {
while(HAL_SD_GetState(&hsd) == HAL_SD_STATE_BUSY){};
while( HAL_SD_GetCardState(&hsd) != HAL_SD_CARD_TRANSFER ){};
  }

  return ret;
}

int8_t STORAGE_Write_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
  int8_t ret = USBD_FAIL;

  if( HAL_SD_WriteBlocks_DMA(&hsd, buf, blk_addr, blk_len) == HAL_OK )
  { ret = USBD_OK;}

  if( USBD_OK == ret )
  {
   while(HAL_SD_GetState(&hsd) == HAL_SD_STATE_BUSY){};
   while( HAL_SD_GetCardState(&hsd) != HAL_SD_CARD_TRANSFER ){};
  }

  return ret;
}