本程序使用单片机I/O口模拟并口于CH375进行通信，可以读出U盘的参数，并且可以把U盘当做存储器，读写任意的扇区-This procedure using the MCU I/O port simulation parallel port to communicate on the CH375, you can read U disk parameters, which can be as U disk memory, read and write arbitrary sector