求大神帮我看一眼这个单片机程序仿真时为什么按键没反应? -

#include<reg51.h>
#define uint unsigned int
#define uchar unsigned char
uint a,b,i,min,hour,minge,minshi,hourge,hourshi,amin,ahour,aminge,aminshi,ahourge,ahourshi,sec;
uchar int_time;
sbit key1=P1^0;
sbit key2=P1^1;
sbit key3=P1^2;
sbit key4=P1^3;
sbit lcdrs=P2^0;
sbit lcdrw=P2^1;
sbit lcden=P2^2;
sbit led=P2^4;
sbit sound=P2^5;
uchar code table1[]={'0','1','2','3','4','5','6','7','8','9'};
uchar code table2[]="Time:00:00 " ;
uchar code Alarm_1[]="Alarm:00:00 ";
uchar code nul[]=" ";
void delay(unsigned int xms) //??????
{ uint i,j;
for(i=xms;i>0;i--)
for(j=124;j>0;j--);
}
void write_com(uchar com) //LCD???????
{ delay(5) ;
lcdrs=0;
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_data(uchar date) //LCD???????
{
delay(5);
lcdrs=1;
P0=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void clock_write()
{ while(1)
{
if(key1==0)
{ delay(10);
if(key1==0)
{
if(hour==23) // ???????
hour=0;
else
hour++;
hourge=hour%10;
hourshi=hour/10;
write_com(0x0f);
delay(2);
write_com(0x80+6);
write_data(table1[hourge]);
delay(5);
write_com(0x80+5);
delay(2);
write_data(table1[hourshi]);
while(!key1);
delay(1);
}
}
if(key2==0)
{
delay(10);
if(key2==0)
{
if(min==59) //????????
min=0;
else
min++;
minge=min%10;
minshi=min/10;
write_com(0x0f);
write_com(0x80+9);
write_data(table1[minge]);
delay(1);
write_com(0x80+8);
write_data(table1[minshi]);
delay(1);
while(!key2);
}
}
if(key3==0)
{
delay(10);
if(key3==0)
{
write_com(0x0c);
TR1=1;
while(!key3);
break;
}
}
}
}
void alarm()
{
while(1)
{
if(key1==0)
{
delay(10);
if(key1==0)
{
if(ahour==24)
ahour=0;
else
ahour++;
ahourge=ahour%10;
ahourshi=ahour/10;
write_com(0x0f);
delay(2);
write_com(0x80+0x40+8);
write_data(':');
write_com(0x80+0x40+7);
write_data(table1[ahourge]);
delay(1);
write_com(0x80+0x40+6);
delay(2);
write_data(table1[ahourshi]);
delay(1);
while(!key1);
}
}
if(key2==0)
{
delay(10);
if(key2==0)
{
if(amin==59)
amin=0;
else
amin++;
aminge=amin%10;
aminshi=amin/10;
write_com(0x0f);
delay(2);
write_com(0x80+0x40+10);
write_data(table1[aminge]);
delay(1);
write_com(0x80+0x40+9);
delay(2);
write_data(table1[aminshi]);
delay(1);
while(!key2);
}
}
if(key3==0)
{
delay(10);
if(key3==0)
{
write_com(0x0c);
write_com(0x80+0x40);
for(i=0;i<11;i++)
write_data(nul[i]);
while(!key3);
break;
}
}
}
}
void keyscan()
{
if(key1==0)
{
delay(10);
if(key1==0)
{
while(!key1);
time();
}
}
else if(key2==0)
{
delay(10);
if(key2==0)
{
while(!key2)
{
ahourge=ahour%10;
ahourshi=ahour/10;
write_com(0x80+0x40+7);
write_data(table1[ahourge]);
delay(5);
write_com(0x80+0x40+6);
delay(2);
write_data(table1[ahourshi]);
aminge=amin%10;
aminshi=amin/10;
write_com(0x80+0x40+10);
write_data(table1[aminge]);
delay(5);
write_com(0x80+0x40+9);
delay(2);
write_data(table1[aminshi]);
write_com(0x80+0x40);
for(i=0;i<11;++i)
write_data(Alarm_1[i]);
}
write_com(0x80+0x40);
for(i=0;i<11;i++)
write_data(nul[i]);
}
}
else if(key3==0)
{
delay(10);
if(key3==0)
{
while(!key3);
ahourge=ahour%10;
ahourshi=ahour/10;
write_com(0x80+0x40+7);
write_data(table1[ahourge]);
delay(5);
write_com(0x80+0x40+6);
delay(2);
write_data(table1[ahourshi]);
aminge=amin%10;
aminshi=amin/10;
write_com(0x80+0x40+10);
write_data(table1[aminge]);
delay(5);
write_com(0x80+0x40+9);
delay(2);
write_data(table1[aminshi]);
write_com(0x80+0x40);
for(i=0;i<11;++i)
write_data(Alarm_1[i]);
alarm();
}
}
else if(key4==0)
delay(5);
if(key4==0)
{
while(!key4);
a=a+1;
if(a%2==0)
{
for(b=0;b<6;b++)
{
sound=~sound;
delay(200);
}
sound=1;
}
else if(a%2==1)
{
sound=0;
delay(300);
sound=1;
delay(300);
}
sound=1;
}
}
void main()
{
TMOD=0x01;
TH0=(65536-46483)/256;
TL1=(65536-46483)%256;
EA=1;
ET0=1;
TR0=1;
int_time=0;
sec=55;
min=59;
hour=23;
}
void T0_interserve(void) interrupt 1
{
int_time++;
if(int_time==20)
{int_time=0;
sec++;
}
if(sec==60)
{ sec=0;
min++;
}
if(min==60)
{min=0;
hour++;
}
if(hour==24)
{hour=0;}
TH0=(65536-46483)/256;
TL1=(65536-46483)%256;
}

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