51單片機(jī)溫度報(bào)警DS18B20系統(tǒng)程序
51單片機(jī)溫度報(bào)警DS18B20系統(tǒng)程序：
#include "AT89X52.h"
#include "stdio.h"
#define uint unsigned int
#define uchar unsigned char //宏定義
#define SET P3_1 //定義調(diào)整鍵
#define DEC P3_2 //定義減少鍵
#define ADD P3_3 //定義增加鍵
#define BEEP P3_7 //定義蜂鳴器
#define DQ P3_6 //定義DS18B20總線I/O
bit shanshuo_st; //閃爍間隔標(biāo)志
bit beep_st; //蜂鳴器間隔標(biāo)志
sbit DIAN = P2^7; //小數(shù)點(diǎn)
uchar x=0; //計(jì)數(shù)器
signed char m; //溫度值全局變量
uchar n; //溫度值全局變量
uchar set_st=0; //狀態(tài)標(biāo)志
signed char shangxian=38; //上限報(bào)警溫度，默認(rèn)值為38
signed char xiaxian=5; //下限報(bào)警溫度，默認(rèn)值為38
uchar code LEDData[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xff};
void Delay(uint num)
{
while( --num );
}
void Delay_DS18B20(int num)
{
while(num--) ;
}
void Init_DS18B20(void)
{
unsigned char x=0;
DQ= 1; //DQ復(fù)位
Delay_DS18B20(8); //稍做延時(shí)
DQ= 0; //單片機(jī)將DQ拉低
Delay_DS18B20(80); //精確延時(shí)，大于480us
DQ= 1; //拉高總線
Delay_DS18B20(14);
x =DQ; //稍做延時(shí)后，如果x=0則初始化成功，x=1則初始化失敗
Delay_DS18B20(20);
}
unsigned char ReadOneChar(void)
{
unsigned char i=0;
unsigned char dat = 0;
for(i=8;i>0;i--)
{
DQ = 0; // 給脈沖信號(hào)
dat>>=1;
DQ = 1; // 給脈沖信號(hào)
if(DQ)
dat|=0x80;
Delay_DS18B20(4);
}
return(dat);
}
void WriteOneChar(unsigned char dat)
{
unsigned char i=0;
for(i=8; i>0; i--)
{
DQ = 0;
DQ = dat&0x01;
Delay_DS18B20(5);
DQ = 1;
dat>>=1;
}
}
unsigned int ReadTemperature(void)
{
unsigned char a=0;
unsigned char b=0;
unsigned int t=0;
float tt=0;
Init_DS18B20();
WriteOneChar(0xCC); //跳過讀序號(hào)列號(hào)的操作
WriteOneChar(0x44); //啟動(dòng)溫度轉(zhuǎn)換
Init_DS18B20();
WriteOneChar(0xCC); //跳過讀序號(hào)列號(hào)的操作
WriteOneChar(0xBE); //讀取溫度寄存器
a=ReadOneChar(); //讀低8位
b=ReadOneChar(); //讀高8位
t=b;
t<<=8;
t=t|a;
tt=t*0.0625;
t=tt*10+0.5; //放大10倍輸出并四舍五入
return(t);
}
void InitTimer(void)
{
TMOD=0x1;
TH0=0x3c;
TL0=0xb0; //50ms（晶振12M）
}
void timer0(void) interrupt 1
{
TH0=0x3c;
TL0=0xb0;
x++;
}
void int0(void) interrupt 0
{
EX0=0; //關(guān)外部中斷0
if(DEC==0&&set_st==1)
{
shangxian--;
if(shangxian
}
elseif(DEC==0&&set_st==2)
{
xiaxian--;
if(xiaxian<0)xiaxian=0;
}
}
void int1(void) interrupt 2
{
EX1=0; //關(guān)外部中斷1
if(ADD==0&&set_st==1)
{
shangxian++;
if(shangxian>99)shangxian=99;
}
elseif(ADD==0&&set_st==2)
{
xiaxian++;
if(xiaxian>shangxian)xiaxian=shangxian;
}
}
void check_wendu(void)
{
uinta,b,c;
c=ReadTemperature()-5; //獲取溫度值并減去DS18B20的溫漂誤差
a=c/100; //計(jì)算得到十位數(shù)字
b=c/10-a*10; //計(jì)算得到個(gè)位數(shù)字
m=c/10; //計(jì)算得到整數(shù)位
n=c-a*100-b*10; //計(jì)算得到小數(shù)位
if(m<0){m=0;n=0;} //設(shè)置溫度顯示上限
if(m>99){m=99;n=9;} //設(shè)置溫度顯示上限
}
Disp_init()
{
P2 =0xbf; //顯示-
P1 =0xf7;
Delay(200);
P1 =0xfb;
Delay(200);
P1 =0xfd;
Delay(200);
P1 =0xfe;
Delay(200);
P1 =0xff; //關(guān)閉顯示
}
Disp_Temperature() //顯示溫度
{
P2=0xc6; //顯示C
P1 =0xf7;
Delay(300);
P2=LEDData[n]; //顯示個(gè)位
P1 =0xfb;
Delay(300);
P2=LEDData[m]; //顯示十位
DIAN= 0; //顯示小數(shù)點(diǎn)
P1 =0xfd;
Delay(300);
P2=LEDData[m/10]; //顯示百位
P1 =0xfe;
Delay(300);
P1 =0xff; //關(guān)閉顯示
}
Disp_alarm(uchar baojing)
{
P2=0xc6; //顯示C
P1 =0xf7;
Delay(200);
P2=LEDData[baojing]; //顯示十位
P1 =0xfb;
Delay(200);
P2=LEDData[baojing/10]; //顯示百位
P1 =0xfd;
Delay(200);
if(set_st==1)P2 =0x89;
elseif(set_st==2)P2 =0xc7; //上限H、下限L標(biāo)示
P1 =0xfe;
Delay(200);
P1 =0xff; //關(guān)閉顯示
}
void Alarm()
{
if(x>=10){beep_st=~beep_st;x=0;}
if((m>=shangxian&&beep_st==1)||(m
elseBEEP=1;
}
void main(void)
{
uint z;
InitTimer(); //初始化定時(shí)器
EA=1; //全局中斷開關(guān)
TR0=1;
ET0=1; //開啟定時(shí)器0
IT0=1;
IT1=1;
check_wendu();
check_wendu();
for(z=0;z<300;z++)
{
Disp_init();
}
while(1)
{
if(SET==0)
{
Delay(2000);
do{}while(SET==0);
set_st++;x=0;shanshuo_st=1;
if(set_st>2)set_st=0;
}
if(set_st==0)
{
EX0=0; //關(guān)閉外部中斷0
EX1=0; //關(guān)閉外部中斷1
check_wendu();
Disp_Temperature();
Alarm(); //報(bào)警檢測(cè)
}
else if(set_st==1)
{
BEEP=1; //關(guān)閉蜂鳴器
EX0=1; //開啟外部中斷0
EX1=1; //開啟外部中斷1
if(x>=10){shanshuo_st=~shanshuo_st;x=0;}
if(shanshuo_st) {Disp_alarm(shangxian);}
}
else if(set_st==2)
{
BEEP=1; //關(guān)閉蜂鳴器
EX0=1; //開啟外部中斷0
EX1=1; //開啟外部中斷1
if(x>=10){shanshuo_st=~shanshuo_st;x=0;}
if(shanshuo_st) {Disp_alarm(xiaxian);}
}
}
}
下載文檔
