#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit DQ = P3^6; //DS18B20數據口
uchar FLAG=0; //正負溫度標志
unsigned char TMPH,TMPL;
//這三個引腳參考資料
sbit E=P2^7; //1602使能引腳
sbit RW=P2^6; //1602讀寫引腳
sbit RS=P2^5; //1602數據/命令選擇引腳
void delay_1()
{
int i,j;
for(i=0; i<=10; i++)
for(j=0; j<=2; j++)
;
}
// 1602命令函數
void enable(uchar del)
{
P0 = del;
RS = 0;
RW = 0;
E = 0;
delay_1();
E = 1;
delay_1();
}
void write(uchar del)
{
P0 =del;
RS = 1;
RW = 0;
E = 0;
delay_1();
E = 1;
delay_1();
}
// 1602初始化，請參考1602的資料
void L1602_init(void)
{
enable(0x01);
enable(0x38);
enable(0x0c);
enable(0x06);
enable(0xd0);
}
//改變液晶中某位的值，如果要讓第一行，第五個字符顯示"b" ，調用該函數如下 L1602_char(1,5,'b')
void L1602_char(uchar hang,uchar lie,char sign)
{
uchar a;
if(hang == 1) a = 0x80;
if(hang == 2) a = 0xc0;
a = a + lie - 1;
enable(a);
write(sign);
}
//改變液晶中某位的值，如果要讓第一行，第五個字符開始顯示"ab cd ef" ，調用該函數如下L1602_string(1,5,"ab cd ef;")
void L1602_string(uchar hang,uchar lie,uchar *p)
{
uchar a;
if(hang == 1) a = 0x80;
if(hang == 2) a = 0xc0;
a = a + lie - 1;
enable(a);
while(1)
{
if(*p == '\0') break;
write(*p);
p++;
}
}
void delay(uint N)
{
int i;
for(i=0; i<N; i++)
;
}
Init_Ds18b20()
{
bit Status_Ds18b20;
DQ=1;
DQ=0;
delay(250);
DQ=1;
delay(20);
if(!DQ)
Status_Ds18b20=0;
else
Status_Ds18b20=1;
delay(250);
DQ=1;
return Status_Ds18b20;
}
uchar Read_Ds18b20()
{
uchar i=0,dat=0;
for(i=0;i<8;i++)
{
DQ=1;
DQ=0;
dat>>=1;
DQ=1;
if(DQ)
dat|=0x80;
DQ=1;
delay(25);
}
return dat;
}
void Witie_Ds18b20(uchar dat)
{
uchar i=0;
for(i=0;i<8;i++)
{
DQ=1;
dat>>=1;
DQ=0;
DQ=CY;
delay(25);
DQ=1;
}
}
void chuli()
{
uint temp;
float tem;
Init_Ds18b20(); //復位
Witie_Ds18b20(0xcc); //寫跳過ROM命令
Witie_Ds18b20(0x44); //開啟溫度轉換
Init_Ds18b20();
Witie_Ds18b20(0xcc);
Witie_Ds18b20(0xbe); //讀暫存器
TMPL = Read_Ds18b20();
TMPH = Read_Ds18b20();
temp = TMPH;
temp <<= 8;
temp = temp | TMPL;
if(TMPH>=8)
{
temp=~temp+1;
FLAG=1;
}
else FLAG=0;
tem=temp*0.0625;
temp=tem*100;
if((temp/10000)==0) //當高位為0時不顯示0
L1602_char(2,5,' ');
else
L1602_char(2,5,temp/10000 + 48);
if((temp/10000)==0&&(temp/1000%10)==0) //當高位為0時不顯示0
L1602_char(2,6,' ');
else
L1602_char(2,6,temp/1000%10 + 48);
L1602_char(2,7,temp/100%10 + 48);
L1602_char(2,8,0x2e);
L1602_char(2,9,temp/10%10 + 48);
L1602_char(2,10,temp%10 + 48);
L1602_char(2,11,0xdf); //溫度符號C前的圈
if(FLAG==1)
L1602_char(2,4,0x2d); //輸出-號
else
L1602_char(2,4,0x2b); //輸出+號
}
void main()
{
// float tt;
// uint temp;
P2 = 0x00;
L1602_init();
L1602_string(1,1," DS18B20 TEST ");
L1602_string(2,1," C");
while(1)
{
chuli();
}
}
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