#include <reg51.h>
#define uint unsigned int
#define uchr unsigned char
sbit led0=P2^2;
sbit buzzer=P2^3;
sbit dula=P2^6; //聲明段選線選通端
sbit wela=P2^7; //聲明位選線選通端
sbit clear=P3^4;
uchr key,shi,ge,count;
uchr code tab[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,
0x76,0x79,0x38,0x3f};
/*延時子函數，xms為形參*/
void delay(uint xms)
{
uint x,y;
for(x=xms;x>0;x--)
for(y=110;y>0;y--);
}
/*矩陣鍵盤掃描子程序*/
void matrixkeyscan()
{
uint temp;
P3=0xf7; //給P3口賦值
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0) //檢測是否有鍵按下
{
delay(6); //延時去抖
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0) //再次檢測是否有鍵按下
{
temp=P3;
switch(temp)
{
case 0x77:
key=1;
break;
case 0xb7:
key=2;
break;
case 0xd7:
key=3;
break;
case 0xe7:
key=4;
break; //判斷按下的是哪個鍵
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
} //等待按鍵釋放
}
}
P3=0xfb;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(6);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0x7b:
key=5;
break;
case 0xbb:
key=6;
break;
case 0xdb:
key=7;
break;
case 0xeb:
key=8;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(6);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0x7d:
key=9;
break;
case 0xbd:
key=10;
break;
case 0xdd:
key=11;
break;
case 0xed:
key=12;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xfe;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(6);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0x7e:
key=13;
break;
case 0xbe:
key=14;
break;
case 0xde:
key=15;
break;
case 0xee:
key=16;
break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
}
/*主函數*/
void alarm()
{
buzzer=~buzzer;
led0=~led0;
delay(30);
}
void display(uchr num)
{
if(key!=0) //若有鍵按下，則進入該循環進行處理
{
dula=1;
P0=tab[num/10];
dula=0;
P0=0x00;
wela=1;
P0=0xfe;
wela=0;
delay(100);
dula=1;
P0=tab[num%10];
dula=0;
P0=0x00;
wela=1;
P0=0xfd;
wela=0;
delay(100);
alarm();
}
}
void main()
{
P0=0x00;
while(1)
{
matrixkeyscan();
display(key);
}
}
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