说明：  51单片机读写U盘C程序 /* 这个程序用180行C代码就能够读取FAT16文件系统U盘的根目录,可以看到根目录下的文件 名,并可显示 首文件内容
(51 MCU read U disk C program/* this program with 180 lines C code can read U disk FAT16 file system root directory, you can see the root directory of the file name, file contents can be displayed in the first)