tianxiang2.c

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

#define uchar unsigned char 
#define uint unsigned int 

sbit ds=P2^2;
sbit dula=P2^6;
sbit wela=P2^7;
sbit beep=P2^3;

uint temp;
float f_temp;

unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66, 0x6d,0x7d,0x07,0x7f,0x6f,
0xBf,0x86,0xDb,0xCf,0xE6, 0xEd,0xEd,0x87,0xFf,0xEf};    
//共阴极数码管显示数字0.，1.，2.，3.，4.，5.，6.，7.，8.，9.    

void delay(uint z)
{	
	uint x,y;
	for(x=z;x>0;x--)
		for(y=110;y>0;y--);	
}

void dsreset()
{
	uint i;
	ds=0;
	i=103;
	while(i>0) i--;
	ds=1;
	i=4;
	while(i>0) i--;
}   

bit tempreadbit()
{
	uint i;
	bit dat;
	ds=0;i++;
	ds=1;i++;i++;
	dat=ds;
	i=8;
	while(i>0) i--;
	return (dat);
}

uchar tempread()
{
	uchar i,j,dat;
	dat=0;
	for(i=1;i<=8;i++)
	{
		j=tempreadbit();
		dat=(j<<7)|(dat>>1);
	}
	return (dat);
}

void tempwritebyte(uchar dat)
{
	uint i;
	uchar j;
	bit testb;
	for(j=1;j<=8;j++)
	{
		testb=dat&0x01;
		dat=dat>>1;
		if(testb)
		{
			ds=0;
			i++;i++;
			ds=1;
			i=8;while(i>0) i--;
		}
		else
		{
			ds=0;
			i=8;
			while(i>0) i--;
			ds=1;
			i++;i++;
		}
	}
}

void tempchange()
{
	dsreset();
	delay(1);
	tempwritebyte(0xcc);
	tempwritebyte(0x44);
}

uint get_temp()
{
	uchar a,b;
	dsreset();
	delay(1);
	tempwritebyte(0xcc);
	tempwritebyte(0xbe);
	a=tempread();
	b=tempread();
	temp=b;
	temp<<=8;
	temp=temp|a;
	f_temp=temp*0.0625;
	temp=f_temp*10+0.5;
	f_temp=f_temp+0.05;
	return temp;
}

void display(uchar num,uchar dat)
{
	uchar i;
	dula=0;
	P0=table[dat];
	dula=1;
	dula=0;
	wela=0;
	i=0xFF;
	i=i&(~((0x01)<<(num)));
	P0=i;
	wela=1;
	wela=0;
	delay(1);
}

void dis_temp(uint t)
{
	uchar i;
	i=t/100;
	display(0,i);
	i=t%100/10;
	display(1,i);
	i=t%100%10;
	display(2,i);
}
void main()
{	
	uchar ii;
	while(1)
	{
		tempchange();
		for(ii=0;ii<5;ii++)
		{
			dis_temp(get_temp());
		}
	}
}