用单片机C写一程序，主要功能就是单片机接收到计算机发送过来的特定信息（计算机不断的发送信息）后，单片机再发信息给计算机。-Write a C program MCU, the main function is the MCU receives the computer sent specific information after constantly send information (computer), single chip microcomputer to send information to a computer.