程序如下，点阵，数码管都关了。灯还是很暗；
#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit sda=P2^0;
sbit scl=P2^1;
sbit clk=P2^4;
sbit lie=P2^5;
sbit wei=P2^7;
sbit duan=P2^6;
sbit led=P1^4;
void delay()
{ ; ;
}
void delay1(uchar z)
{
uchar x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void start() //开始
{
sda=1;
delay();
scl=1;
delay();
sda=0;
delay();
}
void stop() //停止
{
sda=0;
delay();
scl=1;
delay();
sda=1;
delay();
}
void respons() //应答
{ uchar m;
scl=1;
delay();
while((sda==1)&&(m<255))
m++;
scl=0;
delay();
}
void write_byte(uchar x) //写一个字节数据
{ uchar i,temp;
temp=x;
for(i=0;i<8;i++)
{
scl=0;
delay();
temp=temp<<1;
sda=CY;
delay();
scl=1;
delay();
}
scl=0;
delay();
sda=1;
delay();
}
uchar read_byte() //读一个字节数据
{ uchar i,k;
scl=0;
delay();
sda=1;
delay();
for(i=0;i<8;i++)
{
scl=1;
delay();
k=k<<1|sda;
delay();
scl=0;
delay();
}
return k;
}
void out164(uchar z) //164数据输入
{ uchar i;
for(i=0;i<8;i++)
{ lie=z&0x80;
clk=0;
clk=1;
z=z<<1;
}
}
void init() //初始化
{
scl=1;
sda=1;
delay();
duan=1; //关数码管
P0=0;
duan=0;
wei=1;
P0=0xff;
wei=0;
led=0;
out164(0); //关点阵
}
void write_aad_date(uchar add,uchar date) //向某地址写入一个数
{
start();
write_byte(0xa0);
respons();
write_byte(add);
respons();
write_byte(date);
respons();
stop();
}
uchar read_add_date(uchar add) //从某地址读出该数
{ uchar a;
start();
write_byte(0xa0);
respons();
write_byte(add);
respons();
start();
write_byte(0xa1);
respons();
a=read_byte();
respons();
stop();
return a;
}
void main() //主函数
{
init();
write_aad_date(01,0x55);
delay1(100);
P0=read_add_date(01);
}
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