既昨天的430串口程序后又添加了几个程序模块。3*4的矩阵键盘扫描以及通过锁存器IO口复用来驱动数码管。功能是这样：先对按键进行消抖，然后判断键值通过数码管显示通过串口发送出去。-Both procedures after yesterday' s 430 serial port to add a few program modules. 3* 4 matrix keyboard scanning and recovery through the latch to drive the di

基于MODBUS协议的单片机通信程序，亮点是该程序按键扫描程序利用状态机扫描。-Microcontroller based on MODBUS protocol communication program, the program key highlight of the scanner using the state machine scanning.