基于8051通过串口测试4*4矩阵键盘，通过键盘按键发送A-F字符到串口调试助手。本程序可通过加LCD1602接受串口发送过来的数据。-Based on 8051 through the serial port test 4* 4 matrix keyboard, the keyboard keys send characters to the serial debug AF assistant. This program can be sent by Canada LCD1602 receiv

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

通过4X4矩阵键盘和数码管设置频率，按下确认按键后在AD9850输出相应的频率-keyboard scan