这个程序不加按键可以正常显示，加上按键之后按键不起作用，按键功能是按一下采集一个数，想问一下怎么解决？
程序如下：
#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
uchar code zixingma[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
uchar code weixuan[]={0x10,0x20,0x40,0x80};
sbit ST=P3^0;
sbit OE=P3^1;
sbit EOC=P3^2;
sbit ALE=P3^3;
sbit P07=P0^7;
sbit key=P3^5;
void key_scan(void);
void caiji(void);
void delay5ms(void)
{
unsigned char i,j;
for(i=10;i>0;i--)
for(j=248;j>0;j--);
}
uchar flag;
void delay(uchar t)
{
while(t--);
}
void disp(uint num)
{
uchar i,zheng,dian1,dian2,dian3;
zheng=num/1000;
dian1=num%1000/100;
dian2=num%100/10;
dian3=num%100%10;
for(i=0;i<4;i++)
{
P1=0xff;
switch(i)
{
case 0:P2=weixuan[ i];P0=zixingma[zheng];P07=0;break;
case 1:P2=weixuan[ i];P0=zixingma[dian1];break;
case 2:P2=weixuan[ i];P0=zixingma[dian2];break;
case 3:P2=weixuan[ i];P0=zixingma[dian3];break;
}
delay(200);
}
}
uint ADC0809(void)
{
uint n;
OE=0;
ST=0;
ALE=0;
ST=1;
ALE=1;
ST=0;
ALE=0;
delay(10);
while(!EOC);
OE=1;
n=P1;
OE=0;
return n;
}
void main()
{
while(1)
{
key_scan();
switch(flag)
{
case 0:caiji(); disp(ADC0809()*19.6078);break;
}
}
}
void key_scan()
{
if(key==0)
{
delay5ms();
if(key==0)
{
flag=0;
while(key==1)
delay5ms();
}
}
}
void caiji()
{
uint ADC0809(void);
}
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