DS18B20温度传感器+12864显示屏显示当前温度

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

#define uchar unsigned char
#define uint unsigned int

sbit DS=P2^2;
sbit lcden=P3^4;
sbit lcdrs=P3^5;
sbit lcdrw=P3^6;
sbit lcdpsb=P1^7;
sbit wela=P2^6;
sbit dula=P2^7;

uchar dis1[]={"--------"};/*display1*/
uchar dis2[]={"当前温度"};
uchar dis4[]={"--------"};
uint temp;

void delay_ms(uint);
void lcd_init();
void write_cmd(uchar);
void write_dat(uchar);
void lcd_pos(uchar,uchar);

void dsreset();
bit tmpreadbit();
uchar tempread();
void tmpwritebyte(uchar);
void tmpchange();
uint tmp();

void main()
{
    uchar i,buff[4];
    uint temp;

    wela=0;
    dula=0;
    delay_ms(10);
    lcd_init();

    lcd_pos(0,2);
    i=0;
    while(dis1[i]!=0)
    {
    write_dat(dis1[i]);
    i++;
    }

    lcd_pos(1,2);
    i=0;
    while(dis2[i]!=0)
    {
    write_dat(dis2[i]);
    i++;
    }

    lcd_pos(3,2);
    i=0;
    while(dis4[i]!=0)
    {
    write_dat(dis4[i]);
    i++;
    }

    while(1)
    {
    tmpchange();
    temp=tmp();

    lcd_pos(2,2);


    sprintf(buff,"%d",temp);
    write_dat(buff[0]);
    write_dat(buff[1]);
    write_dat('.');
    write_dat(buff[2]);
    write_dat('\'');
    write_dat('C');
    };
}

/***************ds begin*******************/

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

bit tmpreadbit(void)
{
    uint i;
    bit dat;
    DS=0;i++;
    DS=1;i++;i++;
    dat=DS;
    i=8;while(i>0)i--;
    return (dat);
}

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

void tmpwritebyte(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 tmpchange(void)
{
    dsreset();
    delay_ms(1);
    tmpwritebyte(0xcc);
    tmpwritebyte(0x44);
}

uint tmp()
{
    float tt;
    uchar a,b;
    dsreset();
    delay_ms(1);
    tmpwritebyte(0xcc);
    tmpwritebyte(0xbe);
    a=tmpread();
    b=tmpread();
    temp=b;
    temp<<=8;
    temp=temp|a;
    tt=temp*0.0625;
    temp=tt*10+0.5;
    return temp;
}


/***************ds end*******************/

/***************12864 begin*******************/

void lcd_init()
{
    lcdpsb=1;/*并行方式*/
    write_cmd(0x30);
    delay_ms(5);
    write_cmd(0x0c);
    delay_ms(5);
    write_cmd(0x01);/*清除*/
    delay_ms(5);
}

void lcd_pos(uchar x,uchar y)
{
    uchar pos;
    if(x==0)
    x=0x80;
    else if(x==1)
    x=0x90;
    else if(x==2)
    x=0x88;
    else if(x==3)
    x=0x98;
    pos=x+y;
    write_cmd(pos);
}

void write_cmd(uchar cmd)
{
    lcdrs=0;
    lcdrw=0;
    lcden=0;
    P0=cmd;
    delay_ms(5);
    lcden=1;
    delay_ms(5);
    lcden=0;
}

void write_dat(uchar dat)
{
    lcdrs=1;
    lcdrw=0;
    lcden=0;
    P0=dat;
    delay_ms(5);
    lcden=1;
    delay_ms(5);
    lcden=0;
}

/**************12864 end******************************/

void delay_ms(uint del)
{
    uint i;
    for(;del>0;del--)
        for(i=124;i>0;i--);
}