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為什么P1的第一個燈不亮，哪兒錯了。
#include<reg52.h>
#define uchar unsigned char
sbit sda=P2^0;
sbit scl=P2^1;
uchar a;
void delay1(uchar x)
{
uchar a,b;
for(a=x;a>0;a--)
for(b=1000;b>0;b--);
}
void delay()
{ ; ;}
void start()
{
sda=1;
delay();
scl=1;
delay();
sda=0;
delay();
}
void stop()
{
sda=0;
delay();
scl=1;
delay();
sda=1;
delay();
}
void init()
{
sda=1;
delay();
scl=1;
delay();
}
void respons()
{
uchar i;
scl=1;
delay();
while((sda==1)&&(i<250))i++;
scl=0;
delay();
}
void write_byte(uchar date)
{
uchar i,temp;
temp=date;
for(i=0;i<8;i++)
{
temp=temp<<1;
scl=0;
delay();
sda=CY;
delay();
scl=1;
delay();
}
sda=1;
delay();
}
uchar read_byte()
{
uchar i,n,j;
scl=0;
delay();
sda=1;
delay();
for(i=0;i<8;i++)
{
scl=1;
delay();
j=sda;
n=(n<<1)|j;
scl=0;
delay();
}
return n;
sda=1;
delay();
}
void main()
{
init();
start();
write_byte(0xa0);
respons();
write_byte(3);
respons();
write_byte(0xfe);
respons();
stop();
delay1(100);
start();
write_byte(0xa0);
respons();
write_byte(3);
respons();
start();
write_byte(0xa1);
respons();
a=read_byte();
stop();
P1=a;
while(1);
}
哪兒錯了啊，sda,scl地址沒錯 | 
