D12和89s52+K9F5608组成的系统，完成U盘的功能，此程序是C语言版本，其中D12的操作部分，是周立功的D12开发板上提供的库函数-D12 and 89s52 K9F5608 system consists of complete U-function, this procedure is C language version, which D12 part of the operation, Zhou, who is the D12 development board for the