keil 程序，能实现信号的倍频采样，并将包络值送回上位机，实现上、下位机的通讯-It is a C language，it create a function that the computer can communicate with PC

主要用于单片机与单片机之间的USB通讯的问题，实现数据传输 -Mainly used for single chip microcontroller with between USB and communication problem, realizing data transmission