practise.c

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#include<reg52.h>
#include<intrins.h>

#define uchar unsigned char
#define uint unsigned int

sbit feng=P2^3;
sbit dq=P2^2;
sbit led=P1^0;
sbit dula=P2^6;
sbit wela=P2^7;

uchar L_temper;
uchar H_temper;

uint C_temper;

uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71	
};

uchar code table2[]={
0xfe,0xfd,0xfb,0xf7,0xef,0xdf
};

/******************延时***************************/

void delay_us()
{
	_nop_();
}

void delay_ms(uint z)
{
	uint ii,jj;
	for(ii=z;ii>0;ii--)
		for(jj=110;jj>0;jj--);
}

/****************复位与存在***********************/

void reset()
{	
	dq=1;
	
	dq=0;
	delay_us(600);
	dq=1;
	delay_us(30);
}

void exist()
{
	uchar ii=20;
	while(dq==0||ii<0) ii--;
	delay_us(500);
	dq=1;	
}

/*************************************************/
bit read_bit()
{
	bit bb;
	
	dq=0;
	delay_us(2);
	dq=1;
	delay_us(5);
	bb=dq;
	delay_us(60);	
	
	return bb;
}

/*************************************************/

//读字节
uchar read_byte()
{
	uchar byte=0x00;
	uchar ii=0,jj;
	bit temp;
	//uchar tt=0x01;
	
	while(ii < 8)
	{	
		delay_us(2);
		temp=read_bit();
		byte=(byte>>1)|(temp<<7);
		++ii;	
		/*
		delay_us(2);
		temp=read_bit();
		byte=byte+temp&tt;
		tt<<1;
		*/		
	}
	
	return(byte);
}

//写入字节
void write_byte(uchar xx)
{
	bit bb;
	uchar test=0x01;//*********************************这里可能有问题?
	uchar date=xx;
	uchar ii=0;
	
	while(ii < 8)
	{
		bb=test&date;
		if(bb)
		{
			dq=0;
			delay_us(5);
			dq=1;
			delay_us(15);
		}
		else
		{
			dq=0;
			delay_us(100);
			dq=1;
			delay_us(2);
		}
		++ii;		
	}
			
}

/**********************温度************************/

void convert_temper()
{
	reset();
	exist();
	write_byte(0xCC);
	write_byte(0x44);
}

void read_temper()
{
	uchar LSB_temper=0x00;
	uchar MSB_temper=0x00;

	reset();
	exist();
	write_byte(0xCC);
	write_byte(0xBE);		
	LSB_temper=read_byte();
	MSB_temper=read_byte();
	
	C_temper=MSB_temper;
	C_temper=(C_temper<<8)|LSB_temper;
	C_temper=C_temper*0.0625*10+0.5;
	
	return C_temper;			
}

/******************响应******************************/

void display_temper()
{
	uchar aa,bb,cc;
	
	aa=C_temper/100;
	bb=C_temper%10/10;
	cc=C_temper/10;
	
	wela=1;
	P0=table2[0];
	wela=0;
	delay_ms(2);
	
	dula=1;
	P0=table[cc];
	dula=0;
	delay_ms(2);
	
	wela=1;
	P0=table2[1];
	wela=0;
	delay_ms(2);
	
	dula=1;
	P0=table[bb+0x80];
	dula=0;
	delay_ms(2);

	wela=1;
	P0=table2[2];
	wela=0;
	delay_ms(2);
	
	dula=1;
	P0=table[aa];
	dula=0;
	delay_ms(2);

}

void init1()
{
	
}





void main()
{
	feng=1;	
}