4*4矩阵键盘检测程序(新手用),本程序用于检测4*4矩阵按键,先检测是否有按
键按下,如果有按键按下,由P1口读出相应的编码值,由P0经两片74HC573输出给
8位数码管,P2^0位选,P2^1段选,P1接4*4矩阵按键
#include <reg52.h>
#include<intrins.h> //头文件
#define uchar unsigned char //宏定义
#define uint unsigned int
sbit du=P2^1; //段选位
sbit we=P2^0; //位选位
uchar code duanma[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void delay(xms) //延时函数
{
uchar i,j;
for(xms=i,i>0;i--;)
for(j=11;j>0;j--);
}
void main() //主函数
{
we=1; //位选开
P0=0; //8位数码管全部显示
we=0; //位选关
du=1; //段选开
P1=0x00; //初始化,8位数码管无显示
while(1)
{
uchar a,b;
P1=0xf0;
a=P1;
if(a!=0xf0)
{
delay(5); //去抖动
b=P1;
if(a==b)
{
a=0xfe;
do
{
P1=a;
if(a!=P1)
{
switch(P1)
{
case 0x7e:{P0=duanma[0];break;} //编码检测,第一个键按下显示0,第16个按键按下显示F
case 0xbe:{P0=duanma[1];break;}
case 0xde:{P0=duanma[2];break;}
case 0xee:{P0=duanma[3];break;}
case 0x7d:{P0=duanma[4];break;}
case 0xbd:{P0=duanma[5];break;}
case 0xdd:{P0=duanma[6];break;}
case 0xed:{P0=duanma[7];break;}
case 0x7b:{P0=duanma[8];break;}
case 0xbb:{P0=duanma[9];break;}
case 0xdb:{P0=duanma[10];break;}
case 0xeb:{P0=duanma[11];break;}
case 0x77:{P0=duanma[12];break;}
case 0xb7:{P0=duanma[13];break;}
case 0xd7:{P0=duanma[14];break;}
case 0xe7:{P0=duanma[15];break;}
}
}
a=_crol_(a,1); //循环移位去检测按键
}while(a!=0xef);
}
}
}
}
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