51单片机矩阵扫描键盘程序实例

51单片机矩阵扫描键盘程序实例

51单片机矩阵扫描键盘程序

#include <reg52.h> #include<intrins.h> #define uchar unsigned char #define uint unsigned int uchar idata x,y; uchar code disp_code[] = {

0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, case 0xe7: k=3; break; case 0xde: k=4; break; case 0xdd: k=5; break; case 0xdb: k=6; break; case 0xd7: k=7; break; case 0xbe: k=8; break; case 0xbd: k=9; break; case 0xbb: k=10;break; case 0xb7: k=11;break; case 0x7e: k=12;break; // 0-9 0 1 2 3 4 5 6 7 8 9 0x88, 0x83, 0xc6, 0xa1, 0x86, 0x8e, // 10-15 a b c d e f 0x7F, 0xBF, 0x9C, 0xFF // 16-19 . - 。null }; //数码管显示值列表

void delay(uchar c) {

char a,b; for(a=c;a>0;a--) for(b=110;b>0;b--); }

uchar key_scan() {

uchar k; uchar z;

x=0x00; y=0x00;

P3=0xf0; 值

if(P3!=0xf0) 值，说明有健按下 {

delay(10); 10ms

if(P3!=0xf0) {

x=P3; P3=0x0f; y=P3; z=x|y; switch(z) {

case 0xee: k=0; break; case 0xed: k=1; break; case 0xeb: k=2; break;

//延时函数 //键盘扫描函数 //先给P3赋一个初//判断P3不等于所赋初 //消除键盘抖动 延时 case 0x7d: k=13;break; case 0x7b: k=14;break; case 0x77: k=15;break; } } }

return(k); }

void main() {

uchar dat; while(1) {

P3=0xf0; while(P3!=0xf0) {

dat=key_scan(); P1=0;

P0=disp_code[dat]; } } } 2：

#include <reg52.h> #include<intrins.h> #define uchar unsigned char #define uint unsigned int

uchar idata x,y; uchar code disp_code[] = {

0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, // 0-9 0 1 2 3 4 5 6 7 8 9 0x88, 0x83, 0xc6, 0xa1, 0x86, 0x8e, // 10-15 a b c d e f 0x7F, 0xBF, 0x9C, 0xFF