//本程序我己經(jīng)通過使用，大家可以放心參考，不過這個(gè)程序只能顯示二位，后兩位是顯示一個(gè)溫度的符號(hào)！
#include
#include
#define uchar unsigned char
#define uint unsigned int

uchar code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
uint tempe;

sbit DQ=P3^5;
sbit p=P3^1;
sbit q=P3^2;
sbit r=P3^3;
sbit s=P3^4;

void delay1(uint z) //延時(shí)函數(shù)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--) ;
}

void delay(uint t)
{
while(t--);
}

void display(void)
{
p=0;
P1=table[tempe/10];
delay1(1);
P1=0xff;
p=1;

q=0;
P1=table[tempe];
delay1(1);
P1=0xff;
q=1;

r=0;
P1=0x9c;
delay1(1);
P1=0xff;
r=1;

s=0;
P1=0xc6;
delay1(1);
P1=0xff;
s=1;
}

void init_ds18b20(void)
{
uchar sample;
DQ=1;
delay(8);
DQ=0;
delay(80);
DQ=1;
delay(8);
sample=DQ; //return(sample)帶返回檢測(cè)器件響應(yīng)
delay(4);
}

void wr_ds18b20(uchar dat)
{
uchar i;
for(i=0;i<8;i++)
{
DQ=0;
DQ=dat&0x01;
delay(4);
DQ=1;
dat>>=1;
}
delay(4);
}

uchar re_ds18b20(void)
{
uchar i;
uchar result;
for(i=0;i<8;i++)
{
DQ=0;
result>>=1;
_nop_();
DQ=1;
if(DQ)
result|=0x80;
delay(4);
}
return(result);
}

uchar rd_temperature(void)
{
uchar a,b;
init_ds18b20();
wr_ds18b20(0xcc); //跳過ROM
wr_ds18b20(0x44); //啟動(dòng)溫度測(cè)量
delay(300);

init_ds18b20();
wr_ds18b20(0xcc);
wr_ds18b20(0xbe);
a=re_ds18b20();
b=re_ds18b20();
b<<=4;
b+=(a&0xf0)>>4;
return(b);
}

void main()
{
while(1)
{
tempe=rd_temperature();
display();
delay(1);
display();
delay(1);
}
}