单片机4*4按键数码管显现0-9

#include<reg51.h>

#define KEY P1 //键盘

#define SEG P0 //数码管

sbit COM=P2^0; // 数码管com

sbit OC = P2^1;//573锁存器

char code TAB[]={//0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xa7,0xa1,0x84,0x84,0xbf,0x7f};//共阳极

0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7D,0x07,0x7f,0x6F}; //共阴极

unsigned char scan[4]={0xef,0xdf,0xbf,0x7f}; //扫描码 低电平动作扫描

void delay1ms(int x);

void main(void)

{

unsigned char col,row; //定义列行

unsigned char rowkey,kcode; //定义按键，按键码

COM=0; //点亮数码管

OC=0; // 低电平使能

while(1)

{

for(col=0;col<4;col++) //4列按键

{

KEY =scan[col];

rowkey = ~KEY&0X0F; //例如 读入低4位 反相肃高傲4位，求出行键值

while(rowkey!=0) //假如按下键

{

if(rowkey==0x01) row = 0; //假如第0行被按下

if(rowkey ==0x02) row = 1; //假如第1行被按下

if(rowkey == 0x04) row = 2; //假如第2行被按下

if(rowkey == 0x08) row = 3; //假如第3行被按下

kcode = 4*col+row; //算出按键号码

SEG = TAB[kcode]; //显现

while(rowkey!=0) //假如未放开

rowkey = ~ KEY&0x0f; //再次读入

}

delay1ms(1); //消弭颤动1ms

}

}

}

void delay1ms(int x) //延迟消抖

{

int i,j;

for(i=0;i<x;i++)

for(j=0;j<120;j++); // 120 * 8 = 960us = 1ms

}

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