#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit DS=P2^2;
uint temp;
uchar flag1;
sbit dula=P2^6;
sbit wela=P2^7;
sbit beep=P2^3;
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
unsigned char code table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,
0x87,0xff,0xef};
void delay(uint x)
{
uint i;
while(x)
{
i=200;
while(i>0)
i--;
x--;
}
}
void dsreset(void) //初始化
{
uint i;
DS=0;
i=103;
while(i>0)i--;
DS=1;
i=4;
while(i>0)i--;
}
bit tmpreadbit(void) //寫一個字節
{
uint i;
bit dat;
DS=0;
i++;
DS=1;
i++;
i++;
dat=DS;
i=8;
while(i>0)
i--;
return(dat);
}
uchar tmpread(void) //讀一個字節
{
uchar i,j,dat;
dat=0;
for(i=1;i<=8;i++)
{
j=tmpreadbit();
dat=(j<<7)|(dat>>1); //最低位在前
}
return(dat);
}
void tmpwritebyte(uchar dat) //寫一個字節到18b20
{
uint i;
uchar j;
bit testb;
for(j=1;j<=8;j++)
{
testb=dat&0x01;
dat=dat>>1;
if(testb) //寫1
{
DS=0;
i++;i++;
DS=1;
i=8;while(i>0)i--;
}
else
{
DS=0; //寫0
i=8;while(i>0)i--;
DS=1;
i++;i++;
}
}
}
void tmpchange(void)
{
dsreset();
delay(1);
tmpwritebyte(0xcc);
tmpwritebyte(0x44); //單一溫度轉換
}
uint tmp() //轉換溫度
{
float tt;
uchar a,b;
dsreset();
delay(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;
}
void display(uint temp)
{
uchar A1,A2,A2t,A3;
A1=temp/100;
A2t=temp%100;
A2=A2t/10;
A3=A2t%10;
dula=0;
P0=table[A1];
dula=1;
dula=0;
wela=0;
P0=0xfe;
wela=1;
wela=0;
delay(1);
dula=0;
P0=table1[A2];
dula=1;
dula=0;
wela=0;
P0=0xfd;
wela=1;
wela=0;
delay(1);
P0=table[A3];
dula=1;
dula=0;
P0=0xfb;
wela=1;
wela=0;
delay(1);
}
void main()
{
uchar a;
do
{
tmpchange();
for(a=10;a>0;a--)
{
display(tmp());
}
if(temp>=230)//度數
{
P1=0x00;
beep=0;
}
else
{
beep=1;
P1=0xff;
}
}
while(1);
}
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