用的是DY-mini 80avr转接51的板子写了一段IIC总线的程序，但是下载过后开发板没有显示，求指导，程序如下，求大神解决，不胜感激
#include<reg52.h>
#define uchar unsigned char
sbit scl=P2^0;
sbit sda=P2^1;
void delay()
{ ; ;}
void init()
{
sda=1;
delay();
scl=1;
delay();
}
void start()
{
sda=1;
delay();
scl=1;
delay();
sda=0;
delay();
}
void stop()
{
sda=0;
delay();
scl=1;
delay();
sda=1;
delay();
}
void respons()
{
uchar i;
scl=1;
delay();
while((sda==1)&&(i<255))
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();
}
scl=0;
delay();
sda=1;
delay();
}
uchar read_byte()
{
uchar x,y;
scl=0;
delay();
sda=1;
delay();
for(x=0;x<8;x++)
{
scl=1;
delay();
y=(y<<1)|sda;
scl=0;
delay();
}
return y;
}
void delay1(uchar z)
{
uchar x,y;
for(x=z;x>0;x--)
for(y=100;y<0;y--);
}
void write_add(uchar address,uchar date)
{
start();
write_byte(0xa0);
respons();
write_byte(address);
respons();
write_byte(date);
respons();
stop();
}
uchar read_add(uchar address)
{
uchar date;
start();
write_byte(0xa0);
respons();
write_byte(address);
respons();
start();
write_byte(0xa1);
respons();
date=read_byte();
stop();
return date;
}
void main()
{
init();
write_add(23,0xaa);
delay1(100);
P1=read_add(23);
while(1);
}
想把灯点亮，可是没显示
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