1/*******************************************************************************
* File Name          : AM2301.c
* Author             : ?Ϸ?ΰ
* Date               : 2012-4-23
* Description        : ?¡?ʪ?ȼ?⣬????22.1184M
********************************************************************************/
/*-----------------include-----------------------------------------------------*/
#include<reg51.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char

sbit out=P1^0;
sbit rs=P3^7;
sbit rw=P3^6;
sbit lcden=P2^7;

uint hum,temp;//????ʪ?ȣ??¶?
uchar hum_h,hum_l,temp_h,temp_l,check;//?¡?ʪ?ȸ?8λ????8λ??У??λ
uchar a,shi,ge,shifen,shi1,ge1,shifen1,cnt=0;

void delayms(uint z)
{
	uchar x,y;
	for(x=z;x>0;x--)
		for(y=220;y>0;y--);
}//1ms

void delayus(uint z)
{
	uchar x,y;
	for(x=z;x>0;x--)
		for(y=3;y>0;y--);
}//1us

void write_com(uchar a)
{
	rs=0;
	P0=a;
	delayms(5);
	lcden=1;
	delayms(5);
	lcden=0;
}//Һ??дָ??

void write_dat(uchar b)
{
	rs=1;
	P0=b;
	delayms(5);
	lcden=1;
	delayms(5);
	lcden=0;
}//Һ??д????

void init_1602()
{
	rw=0;
	lcden=0;
	write_com(0x38);
	write_com(0x0c);//????ʾ??????ʾ???
	write_com(0x06);//????дһ???ַ???ַָ???1????????ʾ???ƶ?
	write_com(0x01);//??????ָ?롢??ʾ????0
}//Һ????ʼ??

void init_2301()
{
	delayms(1000);//??ʱһ?ᣬ?ܿ????ȶ?????
	out=0;	  
	delayus(600);//??????ʱ500΢?룬???Ϳ?ʼ?ź?
	out=1;	  
	delayus(40);//?ͷ????ߣ???ʱ30΢??
	while(!out);//???͵ȴ?	
	while(out);//???ߵȴ???????????????
}  

uchar read_byte()
{
	uchar n,byte=0,dat;
	for(n=0;n<8;n++)
	{
	    while(!out);
		delayus(40);//??????28us<??ʱ<70us
		dat=0;
		if(out)  	
			dat=1;
		while(out);
		byte=(byte<<1)|dat;
	}
	return byte;
}			

void get_dat()	//??40λ????
{
//	init_2301();
	hum_h=read_byte();//??ʪ??
	hum_l=read_byte();	
	temp_h=read_byte();//???¶?
	temp_l=read_byte();
	check=read_byte();//??У??
	while(!out);//?ȴ??͵?ƽ????
	out=1;//???????????
}

void zhuanhuan()
{
	a=hum_h+hum_l+temp_h+temp_l;
	if(a==check)
	{
		hum=temp=0;
		hum=((hum|hum_h)<<8)|hum_l;	   //??Ϊһ????
		temp=((temp|temp_h)<<8)|temp_l;
		shi=hum/100;
		ge=hum%100/10;
		shifen=hum%10;	
		shi1=temp/100;
		ge1=temp%100/10;
		shifen1=temp%10;   
	}
	else shi=ge=shifen=shi1=ge1=shifen1=0;
}

void display()
{
	write_com(0x80+0x05);
	write_dat(0x54);//"T"
	write_dat(0x3a);//":"
	write_dat(0x30+shi1);
	write_dat(0x30+ge1);
	write_dat(0x2e);//"."
	write_dat(0x30+shifen1);
	write_dat(0xdf);//"Ȧ"
	write_dat(0x43);//"C"
	write_com(0x80+0x40+0x04);
	write_dat(0x52);//"R"
	write_dat(0x48);//"H"
	write_dat(0x3a);//":"
	write_dat(0x30+shi);
	write_dat(0x30+ge);
	write_dat(0x2e);//"."
	write_dat(0x30+shifen);
	write_dat(0x25);//"%"
}//??ʾ?¡?ʪ??

void main()
{
	init_1602();
	init_2301();
/*	TMOD=0X01;
	TH0=(65536-37037)/256;//??37037????????ֵΪ28499??20ms?ж?1??
	TL0=(65536-37037)%256;
	EA=1;//?????ж?
	ET0=1;//??T0?ж?
	TR0=1;//????T0
	delayms(200);  */
	while(1)
	{	
		get_dat();
		zhuanhuan();
		display();			
		delayms(3000);
	}
}

/*void timer0() interrupt	1
{
	TMOD=0X01;
	TH0=(65536-37037)/256;//??37037????????ֵΪ28499??20ms?ж?1??
	TL0=(65536-37037)%256;
	if(cnt==20)
	{
		display();
	}
	cnt++;
} 	 */