#include<reg52.h>
#include <intrins.h>
#define uchar unsigned char
uchar data sj[6]={1,8,5,9,5,0};//時鐘顯示時間儲存數組
uchar *p=sj;//指向上面數組的指針
uchar a,b,c,t,f=0;
uchar data read;
void display(uchar *m);
void start();
void stop();
void ack();
void noack();
void checkack();
void sendword(uchar data t);
uchar readword();
uchar data smg[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//數碼管段顯對應的十六進制數
sbit p23=P2^3;
sbit p26=P2^6;
sbit p27=P2^7;
sbit SDA=P2^0;
sbit SCL=P2^1;
void delay1(){}//////////////
void delay(uchar x)//延時程序
{
	for(a=x;a>0;a--)
	for(b=5;b>0;b--)
	for(c=89;c>0;c--);
}
void main()
{
	TMOD=0x10;
	ET1=1;
	EA=1;
	PT1=1;
	TH1=0x4c;
	TL1=0x00;
	TR1=1;
	start();
	sendword(0xa0);
	ack();
	sendword(3);
	ack();
//	sendword(1);
//	ack();
	sendword(0x03);
	ack();
	stop();
	
	delay(2);
	start();
	sendword(0xa0);
	ack();
	sendword(3);
//	ack();
//	sendword(1);
	ack();
	
	start();
	sendword(0xa1);
	ack();
	delay(1);
	P1=readword();
	noack();
	stop();
	while(1)
	{
		display(p);
	}
}
void display(uchar *m)//數碼管顯示程序
{	
	uchar s;
	for(s=0;s<6;s++)
	{
		P0=0xff;
		p27=1;
		p27=0;
		P0=smg[*(m+s)];
		p26=1;
		p26=0;
		P0=_crol_(0xfe,s);
		p27=1;
		p27=0;
		delay(1);
	}
}
void timer1()interrupt 3 using 2
{
	TH1=0x4c;
	TL1=0x00;
	t++;////////////
	if(t==20)
	{	
		t=0;
		if(*(p+5)==9)
		{	
			*(p+5)=0;
			if(*(p+4)==5)
			{	
				*(p+4)=0;
				if(*(p+3)==9)
				{	
					*(p+3)=0;
					if(*(p+2)==5)
					{
						*(p+2)=0;
						if(*p==2&&*(p+1)==3) *p=*(p+1)=0;
						else
						{
							if(*(p+1)==9) {*(p+1)=0;*p+=1;}
							else *(p+1)+=1;
						}
					}
					else *(p+2)+=1;
				}
			   	 else *(p+3)+=1;
			 }
			 else *(p+4)+=1;
		 }
		 else *(p+5)+=1;
	  }
}
void start()//起始信號程序
{
	SCL=0;
	delay1();
	SDA=1;
	delay1();
	SCL=1;
	delay1();
	SDA=0;
	delay1();
	SCL=0;
	delay1();
}
void stop()//終止信號程序
{
	SCL=0;
	delay1();
	SDA=0;
	delay1();
	SCL=1;
	delay1();
	SDA=1;
	delay1();
}
void ack()//應答信號時序
{
	uchar n=0;
	SDA=0;
	delay1();
	SCL=1;
	delay1();
	SCL=0;
	delay1();
	SDA=1;
	delay1();
	while((SDA==1)&&(n<50)) n++;
}
void noack()//非應答信號時序
{
	SDA=1;
	delay1();
	SCL=1;
	delay1();
	SCL=0;
	delay1();
}
void sendword(uchar data send)//發送一個字節程序
{
	uchar data n;
	for(n=8;n>0;n--)
	{
		send=send<<1;
		SDA=CY;
		delay1();
		SCL=1;
		delay1();
		SCL=0;
		delay1();
	}
}
uchar readword()//讀取一個數據程序
{
	uchar data n;
	read=0;
	SDA=1;
	delay1();
	for(n=8;n>0;n--)
	{
		SCL=1;
		delay1();
		if(SDA==1) read=(read|0x01);
		else read=(read&0xfe);
		delay1();
		SCL=0;
		delay1();
		if(n!=1) read=_crol_(read,1);
	}
	return read;
}