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DS18B20 下載積分: 黑幣 -5
#include<reg51.h>
#define uint unsigned int
#define uchar unsigned char
uchar xs[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xc6,0xbf};
uchar location[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
sbit DQ=P3^4;
float c;
uchar flag;
void delay(uchar t)
{
while(t--);
}
void delay1(uint a)
{
uint i,j;
for(i=0;i<a;i++)
for(j=0;j<120;j++);
}
void init_ds18b20()
{
uchar n;
DQ=1;
delay(8);
DQ=0;
delay(110);
DQ=1;
delay(25);
n=DQ;
delay(4);
}
void write_byte(uchar dat)
{
uchar i;
for(i=0;i<8;i++)
{
DQ=0;
DQ=dat&0x01;
delay(5);
DQ=1;
dat=dat>>1;
}
delay(5);
}
uchar read_byte()
{
uchar i,value=0x00;
for(i=0;i<8;i++)
{
DQ=0;
DQ=1;
value=value>>1;
delay(3);
if(DQ)
value=value|0x80;
delay(4);
}
return value;
}
uchar readtemperature()
{
uchar a,b,t;
init_ds18b20();
write_byte(0xcc);
write_byte(0x44);
delay1(20);
init_ds18b20();
write_byte(0xcc);
write_byte(0xbe);
a=read_byte();
b=read_byte();
c=0x0f&a;
c*=0.0625;
a>>=4;
b<<=4;
t=b+a;
if(t>128)
{
t=~t+1;
flag=1;
}
else
flag=0;
return t;
}
void display(uchar wei,uchar dat)
{
P2=location[wei];
if(wei==5)
P0=xs[dat]&0x7f;
else
P0=xs[dat];
}
void main()
{
uchar temp;
while(1)
{
temp=readtemperature();
if(flag==1)
{
display(3,12);
delay1(5);
}
display(4,temp/10);
delay1(5);
display(5,temp%10);
delay1(5);
display(6,(int)(c*10)%10);
delay1(5);
display(7,11);
delay1(5);
}
}
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