串行口是嵌入式芯片的基本端口,使用场合很多。一般只能实现一对一的通信和一对多的通信。而往往会碰到要求多个芯片实现多点间任意通信的问题。该文给出了利用串口构成令牌环网的硬件方法以及软件编程方法,很好地解决了多点间自由通讯的问题,具有一定的理论和使用价值。 Serial port is the basic port of embedded chips, use a lot of occasions. Generally only one-on-one communication and one-to-many communication are possible. And often encounter the problem of requiring multiple chips to achieve any communication between multiple points. This paper gives a hardware method and a software programming method of using a serial port to form a token ring network, and solves the problem of free communication between multiple nodes well. It has some theoretical and practical values.