单片机应用PS/2键盘的实例

SMC1602A(16*2)模拟口线接线方式
连接线图:
;;;;;; ---------------------------------------------------
;;;;;; |LCM-----51;; | LCM-----51;; | LCM------51;;;;;;|
;;;;;; --------------------------------------------------|
;;;;;; |DB0-----P1.0 | DB4-----P1.4 | RW-------P2.0;;;;|
;;;;;; |DB1-----P1.1 | DB5-----P1.5 | RS-------P2.1;;;;|
;;;;;; |DB2-----P1.2 | DB6-----P1.6 | E--------P2.2;;;;|
;;;;;; |DB3-----P1.3 | DB7-----P1.7 | VLCD接1K电阻到GND|
;;;;;; ---------------------------------------------------Keyboard接线
;; PS/2--------51
;;;;;;1 DATA------P3.4
;; 3 GND
;;;;;;4 VCC
;;;;;;5 CLK-------P3.3 接在51的外部中断，触发方式为低电平本程序源码只供学习参考，不得应用于商业用途，如有需要请联系作者。[注:AT89x51使用12M或11.0592M晶振,实测使用11.0592M]
[Keil uV2 7.01编译运行通过 程序中没有做键盘数据的奇偶校验]=============================================================*/
#include
#include "scancodes.h"#define LCM_RW;;P2_0 //定义LCD引脚
#define LCM_RS;;P2_1
#define LCM_E;; P2_2
#define LCM_Data;;P1#define Key_Data P3_4 //定义Keyboard引脚
#define Key_CLK;;P3_3#define Busy;;;;0x80 //用于检测LCM状态字中的Busy标识void LCMInit(void);
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
void Delay5Ms(void);
void Delay400Ms(void);
void Decode(unsigned char ScanCode);
void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM,BuysC);unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
unsigned char code cdle_net[] = {"www.cdle.net--"};
unsigned char code email[] = {"pnzwzw@cdle.net"};
unsigned char code Cls[] = {";;;;;;;;;;;;;;;;"};
static unsigned char IntNum = 0; //中断次数计数
static unsigned char KeyV; //键值
static unsigned char DisNum = 0; //显示用指针
static unsigned char Key_UP=0, Shift = 0;//Key_UP是键松开标识，Shift是Shift键按下标识
static unsigned char BF = 0; //标识是否有字符被收到void main(void)
{
unsigned char TempCyc; Delay400Ms(); //启动等待，等LCM讲入工作状态
LCMInit(); //LCM初始化
Delay5Ms(); //延时片刻(可不要) DisplayListChar(0, 0, cdle_net);
DisplayListChar(0, 1, email);
ReadDataLCM();//测试用句无意义
for (TempCyc=0; TempCyc<10; TempCyc++)
;; Delay400Ms(); //延时
DisplayListChar(0, 1, Cls);

IT1 = 0; //设外部中断1为低电平触发
EA = 1;
EX1 = 1; //开中断 do
;;{
;; if (BF)
;;;;Decode(KeyV);
;; else
;;;;EA = 1; //开中断
;;}
while(1);
}//写数据
void WriteDataLCM(unsigned char WDLCM)
{
ReadStatusLCM(); //检测忙
LCM_Data = WDLCM;
LCM_RS = 1;
LCM_RW = 0;
LCM_E = 0; //若晶振速度太高可以在这后加小的延时
LCM_E = 0; //延时
LCM_E = 1;
}//写指令
void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC为0时忽略忙检测
{
if (BuysC) ReadStatusLCM(); //根据需要检测忙
LCM_Data = WCLCM;
LCM_RS = 0;
LC