基于PS/2协议的16×8矩阵键盘设计

The design of 16×8 matrix keyboard based on PS/2 interface

本文采用STC89C58RD+单片机设计了16×8矩阵键盘,实现了PS/2协议,键值修改方便,可应用于各种基于计算机的控制系统。单片机通过定时器中断进入键盘扫描程序,翻转扫描查询法查询矩阵键盘中是否有键值变化。如果有键被按下,则通过查询键值表将该键对应的通码发出;如果有按键抬起,则将该键对应的断码发出。该矩阵键盘可扫描128个按键,满足绝大多数系统需求。所有键值存储在一张表中,对于不同的系统,只需要制作外形不同的矩阵键盘电路,并通过修改键值表即可轻松移植。

In this paper,a 16x8 matrix keyboard basing PS/2 protocol is designed using STC89C58RD＋ single chip microcontroller. It can edit key value conveniently,and can be used in each kind of control system based on computer.Microcontroller scans keyboard when timer interrupter comes,the reversal-scan detects change of the key value.It sends make code when key down,and send break code when key up.It scans 128 key,can used in other system.All of the key value saves in a key table,a edition of key table can make the matrix keyboard working in different keyboard PCB.