这是我的程序，问题在哪里呢？
#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;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void delayms(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void send(uint num)
{
SBUF=num;
while(!TI);
RI=0;
}
void matrixkeyscan()
{ uint num;
if(key1==0)
delayms(100);
{
if(key1==0)
{
num=num+1;
if(num==1000)
{
num=0;
}
}
}
if(key2==0)
delayms(100);
{
if(key2==0)
{
num=num-1;
if(num==0)
{
num=1000;
}
}
}
send(num);
}
void display(uint num)
{ uint bai,shi,ge;
bai=num/100;
shi=num%100/10;
ge=num%10;
dula=1;
P0=table[bai];
dula=0;
wela=1;
P0=0xfe;
wela=0;
delayms(1);
dula=1;
P0=table[shi];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delayms(1);
dula=1;
P0=table[ge];
dula=0;
P0=0xff;
wela=1;
P0=0xfb;
wela=0;
delayms(1);
}
void main()
{
TMOD=0x20;
TH1=0xfd;
TL1=0xfd;
TR1=1;
SM0=0;
SM1=1;
REN=1;
EA=1;
ES=1;
while(1)
{
matrixkeyscan();
}
}
void ser() interrupt 4
{
uint a;
RI=0;
a=SBUF;
display(a);
}
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