合泰USB模拟U盘

请问谁有合泰的32位的芯片使用USB读取SPI FLASH模拟成U盘在电脑端读取和写入文件吗？我现在按照例程中读写SD的方案写了一个读写flash的，但是只能在电脑端读文件，不能写入文件。现在是USB读写flash的函数，其中读函数是一次两个字节，所以读取长度需要少一半，即右移了一位

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u32 FLASHDISK_Write(u32 uId, u8 *pBuffer, u32 uBlockAddress, u32 uLength)

{

  u32 i;

  u32 uResult = TRUE;



  if (uId == FLASHDISK0_ID)

  {

    uResult = TRUE;

    if (gDiskWriteStatus == FLASHDISK_IDLE)

    {

      gDiskWriteStatus = FLASHDISK_WRITE;

      guWriteBufferOffset = 0;

    }

    for (i = 0; i < uLength; i++)

    {

      guWriteBuffer[guWriteBufferOffset + i] = *(pBuffer + i);

    }

    guWriteBufferOffset += uLength;

    if (guWriteBufferOffset == FLASHDISK0_BlockSize)

    {

      gDiskWriteStatus = FLASHDISK_IDLE;

                        uBlockAddress = uBlockAddress<<12;    

      SPI_FLASH_SectorErase(uBlockAddress);

      FATFS_SPI_FLASH_BufferWrite((u8 *)guWriteBuffer,uBlockAddress,FLASHDISK0_BlockSize);

    }

  }

  else

  {

    uResult = FALSE;

  }



  return uResult;

}

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u32 FLASHDISK_Read(u32 uId, u8 **pBuffer, u32 uBlockAddress, u32 uLength)

{

  u32 uResult = TRUE;



  if (uId == FLASHDISK0_ID)

  {

    if ((uBlockAddress / CACHE_CNT != uCachePage / CACHE_CNT) && (uCachePage != uBlockAddress))

    {

      /* Calculate the cache start address which shall be aligned with the cache size.                      */

      uCachePage = (uBlockAddress / CACHE_CNT) * CACHE_CNT;

                        QSPI_FLASH_BufferQuadReadByDMA((u16*)guReadBuffer, uCachePage, (FLASHISK_READ_BUFFER)>>1);

    }

    if ((uCurrentBlock != uBlockAddress) || ((guReadBufferOffset % FLASHDISK0_BlockSize) == 0))

    {

      uCurrentBlock = uBlockAddress;

      guReadBufferOffset = (uBlockAddress - uCachePage) * FLASHDISK0_BlockSize;

    }

    *pBuffer = &(guReadBuffer[guReadBufferOffset]);

    guReadBufferOffset += BOT_MAX_PACKET_SIZE;

  }

  else

  {

    uResult = FALSE;

  }

  return uResult;

}