再问个问题，文件系统章节的

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楼主 | 2018-7-4 14:20 | 只看该作者回帖奖励

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ck, AD, sd, se, TRANSFER

DRESULT disk_read (
      BYTE drv,             /* Physical drive nmuber (0..) */
      BYTE *buff,             /* Data buffer to store read data */
      DWORD sector,       /* Sector address (LBA) */
      BYTE count             /* Number of sectors to read (1..255) */
)
{

      if (count > 1)
      {
            SD_ReadMultiBlocks(buff, sector*BLOCK_SIZE, BLOCK_SIZE, count); //???????

                        /* Check if the Transfer is finished */
         SD_WaitReadOperation();  //循环查询dma传输是否结束

         /* Wait until end of DMA transfer */
         while(SD_GetStatus() != SD_TRANSFER_OK);

      }
      else
      {

            SD_ReadBlock(buff, sector*BLOCK_SIZE, BLOCK_SIZE);

                        /* Check if the Transfer is finished */
         SD_WaitReadOperation();  //循环查询dma传输是否结束

         /* Wait until end of DMA transfer */
         while(SD_GetStatus() != SD_TRANSFER_OK);

      }
      return RES_OK;
}

其中 sector*BLOCK_SIZE 地址乘块大小是什么意思？

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