一个单片机的多任务操作系统写的交通灯控制程序，该程序在单片机开发板上运行正确，可通过PC机的串品发送指令进行控制，程序附有中文注释。-A single chip multi-tasking operating system written in traffic light control program that runs right in the microcontroller development board, PC-string by sending commands to contro