专门为单片机初学者准备的两个小程序，我自己用来调试串行通讯的，一个是单片机不断的发送1234，一个是单片机的收发程序。-Singlechip beginners ready for the two procedures used to debug my own serial communications, a single-chip microcomputer are constantly sending 1234, a single-chip transceiver, the procedures are.