FAT32 header,主要是FAT32的文件结构,包括MBR,DBR,FAT,DIR,DATA

51单片机SPI方式读取SD卡并解析MBR、分区表、FAT32的DBR分区信息通过串口发送至PC串口查看，并解决小端模式数据的解析转换。-51 single-chip SPI way to read SD card and parse the MBR, partition table and FAT32 the DBR partition information is sent through the serial port to the PC serial port to view and s