#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit p2_0=P2^0;
sbit p2_1=P2^1;
sbit p2_2=P2^2;
int kongzhi=0;
int shuang=0;
uchar idata buf_xianshi[2];
uchar idata buf_cunchu[2];
void delay(uint z)
{
	uchar j;
	for(;z>0;z--)
		for(j=10;j>0;j--);
}



void display()
{
	int i;
	for(i=0;i<700;i++)
	{
		p2_1=0;
		p2_0=1;
		P0=buf_xianshi[0];
		delay(10);
		kongzhi++;
		p2_1=1;
		p2_0=0;
		P0=buf_xianshi[1];
		delay(10);
		kongzhi++;
	}	
}

void main()
{
	uchar i;
		   //串行口初始化

	TMOD=0X20;
	TL1=0XFD;
	TH1=0XFD;
	PCON=0X00;
	TR1=1;
	SCON=0X50;
	p2_2=0;
	   	do{
		while(RI==0);		 
		RI=0;
		}while((SBUF^0XAA)!=0);	   //判斷甲機(jī)是否請求
        delay(500);     
        p2_2=1;
		SBUF=0XBB;
				   //發(fā)送應(yīng)答信號 
		while(TI==0);
		TI=0;	
    p2_2=0;
	while(1)
	{
		for(i=0;i<2;i++)
		{
			while(RI==0);
			RI=0;
			buf_cunchu[i]=SBUF;	
			shuang++;	//接收一個數(shù)據(jù)
		}
		shuang=shuang%2;
		if(shuang==0)
		{	buf_xianshi[0]=buf_cunchu[0];
			buf_xianshi[1]=buf_cunchu[1];
		}
		display();
	}

}