//送出去，返回來(lái)。點(diǎn)亮燈。

#include<reg51.h>
#define uchar unsigned char
sbit sda=P1^1;
sbit scl=P1^0;
uchar k;
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 respons()
{
  uchar i;
  scl=1;
  delay();
  while((sda==1)&&(i<250))i++;   //兩個(gè)條件一個(gè)滿(mǎn)足退出
   scl=0;
   delay();
  }

void init()
{
    sda=1;
	delay();
	scl=1;
	delay();
}

void write_byte(uchar date)
{
    uchar i,temp;
	temp=date;

	for(i=0;i<8;i++)
	{
	   temp=temp<<1;
	   scl=0;//數(shù)據(jù)可以變化
	   delay();

	   sda=CY;
	   delay();
	   scl=1;  //高電平期間數(shù)據(jù)穩(wěn)定
	   delay();

	}
	scl=0;
	delay();
	sda=1;  //總線(xiàn)釋放
	delay();
}
uchar read_byte()
 {
   uchar i,k;
   scl=0;
   delay();
   sda=1;
   delay();
	for(i=0;i<8;i++)
	{
	  scl=1;
	  delay();

	  k=((k<<1)|sda) ;   //把sda中的數(shù)據(jù)放最低位中去，循環(huán)8次
	  scl=0;
	  delay();
	}
	return k;
 }

/* void write_add(uchar address,uchar date)  //寫(xiě)入指定地址
 {
 	start();
    write_byte(0xa0);
	respons();
	write_byte(address);
	respons();

	//start();
    write_byte(date);  //讀器件地址
    respons();
	stop();
 }*/
/* uchar read_add(uchar address)
{    uchar date;
 	start();
    write_byte(0xa0);
	respons();
	write_byte(address);
	respons();
    write_byte(0xa1);  //讀器件地址
    respons();
	date=read_byte();
	stop();
	return date;
 }*/
 void delay1(uchar x)
{
	uchar a,b;
	for(a=x;a>0;a--)
	 for(b=100;b>0;b--);
}



  void main()
  {
    init();
	start();
    write_byte(0xa0);
	respons();
	write_byte(3); //讀器件地址
	respons();
    write_byte(0xf0);
    respons();
	stop();

   // write_add(23,0x00);
	delay1(100);

	start();
    write_byte(0xa0);
	respons();
	write_byte(3);
	respons();
    start();
    write_byte(0xa1);  //讀器件地址
    respons();
	P3=read_byte();
	stop();



	while(1);

  }