为什么按第二次以后数码管的示数不改变
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit duan=P2^6;
sbit wei=P2^7;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void delay(uint xms)
{
uint i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--); //延时
}
void display(uchar num)
{
while(1)
{
uchar hang,lie;
hang=num/10;
lie=num%10;
P1=table[lie];
duan=1;
duan=0;
P1=0Xfd;
wei=1;
wei=0;
delay(10);
P1=table[hang];
duan=1;
duan=0;
P1=0Xfe;
wei=1;
wei=0;
delay(10);
}
//数码显示被按键的位置
}
void matrixkeyscan() //确定被按下按键的位置
{
uchar temp,key;
P3=0xfe;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xee:key=0;break;
case 0xde:key=1;break;
case 0xbe:key=2;break;
case 0x7e:key=3;break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
display(key);
}
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xed:key=10;break;
case 0xdd:key=11;break;
case 0xbd:key=12;break;
case 0x7d:key=13;break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
display(key);
}
}
P3=0xfb;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xeb:key=20;break;
case 0xdb:key=21;break;
case 0xbb:key=22;break;
case 0x7b:key=23;break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
display(key);
}
}
P3=0xf7;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0xe7:key=30;break;
case 0xd7:key=31;break;
case 0xb7:key=32;break;
case 0x77:key=33;break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
display(key);
}
}
}
void main()
{
while(1)
{
matrixkeyscan();
}
}
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