程序如下 原本是 按key1 数字加，按key2数字减，按key3数字清零，按key4 数字每秒自动加1。。。现在key1、2、3都正常，按key4没自动加1。求高手赐教。问题出在哪里呢？
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
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 num,numt0;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void init() //定时器0初始化程序
{
TMOD=0x01;
TH0=(65536-45872)/256;
TL0=(65536-45872)%256;
EA=1;
ET0=1;
TR0=1;
}
void delayms(uchar xms) //延时程序
{
uchar i,j;
for(i=xms;i>0;i--)
for(j=113;j>0;j--);
}
void keyscan() //键盘扫描程序
{
if(key1==0) //扫描按键1
{
delayms(10);
if(key1==0)
{
num++;
if(num==60)
num=0;
while(!key1);
}
}
if(key2==0) //扫描按键2
{
delayms(10);
if(key2==0)
{
if(num==0)
num=60;
num--;
while(!key2);
}
}
if(key3==0) //扫描按键3
{
delayms(10);
if(key3==0)
{
num=0;
while(!key3);
}
}
if(key4==0) //扫描按键4
{
delayms(10);
if(key4==0)
{
while(!key4);
TR0=!TR0;
}
}
}
void display(uchar laiyuan)//数码管显示 扫描程序
{
uchar shi,ge;
shi=laiyuan/10;
ge=laiyuan%10;
dula=1;
P0=table[shi];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
P0=0x00;
delayms(5);
dula=1;
P0=table[ge];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
P0=0x00;
delayms(5);
}
void T0_time() interrupt 1 //定时器0 中断服务程序
{
TH0=(65536-45872)/256;
TL0=(65536-45872)%256;
numt0++;
if(numt0==20)
{
numt0=0;
num=num++;
if(num==60)
num=0;
}
}
void main () //主程序
{
num=0x00;
init();
while(1)
{
keyscan();
display(num);
}
}
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