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這是郭天祥的示例程序，因?yàn)榘存I掃描程序用了while死循環(huán)等待按鍵松手，此時(shí)除了中斷程序，其他程序都不能執(zhí)行。可以把數(shù)碼管顯示程序放到中斷里，中斷周期改為5ms就行了。
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
sbit key1=P3^4;
sbit key2=P3^5;
sbit key3=P3^6;
sbit key4=P3^7;
uchar num1,shi,ge;
int num;
bit flag=0;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71
};
void keyscan();
void delay(uint);
void display(uchar);
void main()
{
TMOD=0x01;
// TH0=(65536-45872)/256;
// TL0=(65536-45872)%256;
TH0=(65536-4608)/256;
TL0=(65536-4608)%256;
EA=1;
ET0=1;
TR0=1;
while(1)
{
// display(num);
keyscan();
}
}
void keyscan()
{
if(key1==0)
{
delay(10);
if(key1==0)
{
num++;
if(num==60)
num=0;
while(!key1);
}
}
if(key2==0)
{
delay(10);
if(key2==0)
{
num--;
if(num==-1)
num=59;
while(!key2);
}
}
if(key3==0)
{
delay(10);
if(key3==0)
num=0;
while(!key3);
}
if(key4==0)
{
delay(10);
if(key4==0)
flag=~flag;
while(!key4);
}
}
void display(uchar num)
{
static bit sign=0;
shi=num/10;
ge=num%10;
P0=0x00;//消隱
dula=1;
dula=0;
if(sign==0)
{
P0=0xfe;
wela=1;
wela=0;
P0=table[shi];
dula=1;
dula=0;
sign=~sign;
}
else
{
P0=0xfd;
wela=1;
wela=0;
P0=table[ge];
dula=1;
dula=0;
sign=~sign;
}
}
void delay(uint xms)
{
uint i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--);
}
void T0_time() interrupt 1
{
// TH0=(65536-45872)/256;
// TL0=(65536-45872)%256;
TH0=(65536-4608)/256;
TL0=(65536-4608)%256;
if(flag==1)
{
num1++;
if(num1==200)
{
num1=0;
num++;
if(num==60)
num=0;
}
}
display(num);
}
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