謝謝大家,單片機源程序如下:
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit k1=P1^0;
sbit k2=P1^1;
sbit k3=P1^2;
sbit k4=P1^3;
sbit buz=P3^0;
uchar code duan[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00};
uchar count,shi,ge,dcount,dicount;
unsigned int n = 0;
void delay(int ms)
{
uchar i,j;
for(i=ms;i>0;i--)
for(j=200;j>0;j--);
}
void init()
{
P0=0x6f;
P2=0x6f;
P1=0xff;
buz=0;
TMOD=0x01;
IE=0x82;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=1;
dcount=99;
}
void keyscan()
{
if(k1==0)
{ delay(5);
if(k1==0)
{
TR0=0;
}
}
if(TR0==0)
{
if(k2==0)
{ delay(5);
if(k2==0)
{
dcount++;
if(dcount==100)
dcount=0;
while(!k2)
{
shi=dcount/10;
ge=dcount%10;
P0=duan[shi];
P2=duan[ge];
}
}
}
if(k3==0)
{ delay(5);
if(k3==0)
{
dcount--;
if(dcount==-1)
dcount=99;
while(!k3)
{
shi=dcount/10;
ge=dcount%10;
P0=duan[shi];
P2=duan[ge];
}
}
}
}
if(k4==0)
{ delay(5);
if(k4==0)
{
TR0=1;
}
}
}
void timer0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
if(++count==20)
{
count=0;
dcount--;
if(dcount==-1)
{
TR0=0;
while(k1!=0)
{
P0=0x00;
P2=0x00;
buz=1;
delay(1000);
P0=0x3f;
P2=0x3f;
buz=0;
delay(1000);
}
dcount=99;
}
shi=dcount/10;
ge=dcount%10;
P0=duan[shi];
P2=duan[ge];
}
}
void main()
{
init();
while(1)
{
keyscan();
}
}
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