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#include <reg51.h>
#include <intrins.h>
#include <math.h>
#include "main.h"
char code LED_display[14] = {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xBF,0XFF,0x89,0XC7}; //共陽數碼管段碼
// 0 1 2 3 4 5 6 7 8 9 - H L
char code bit_sel[4] = {0x01,0x02,0x04,0x08};
char dis[4];
unsigned char TL0_temp; /*暫存TL0的初值*/
unsigned char TH0_temp; /*暫存TH0的初值*/
#define INT_CLOCK 5 /*INT_CLOCK為定時值，單位為ms ,此處定義為5ms*/
#define CRY_FREQUENCY 12000000 /*CRY_FREQUENCY為晶振頻率，單位為Hz*/
bit flag = 0; //0-正溫度 1-負溫度
sbit key1 = P3^2; //設置按鍵
sbit key2 = P3^3; //增量按鍵
sbit key3 = P3^4; //減量按鍵
bit bKey1,bKey2,bKey3;
uchar countSet = 0;
sbit ledRed = P1^0; //紅燈
sbit ledYellow = P1^1; //黃燈
sbit ledGreen = P1^2; //綠燈
sbit fan = P1^6; //風扇
sbit beep = P1^5; //蜂鳴器
char shutDowmH = 85; //關機溫度
char SetH = 65; //高溫上限
char SetL = 30; //低溫下限
char alarm = 0;
sbit DQ=P3^6; /* 18B20數據引腳*/
#define temp_h P3|=0x40//單片機向DS18B20輸出高電平
#define temp_l P3&=0xbf//單片機向DS18B20輸出低電平
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void Timer0_init()
{
unsigned long T0_temp; /*暫存T0的初始值 */
T0_temp = 65536-((INT_CLOCK *CRY_FREQUENCY /1000)/12); /*T0初始值計算公式，參考教科書*/
TL0_temp = T0_temp & 0xff;
TH0_temp = T0_temp >> 8;
TL0 = TL0_temp;
TH0 = TH0_temp;
TMOD |= 0x01;
TR0 = 1;
ET0 = 1;
EA = 1; /*開定時器0中斷*/
}
void INT0_Init()
{
EX0 = 1;
IT0 = 1;
}
void delay1ms(unsigned int ms)//延時1毫秒（不夠精確的）
{
unsigned int i,j;
for(i=0;i<ms;i++)
for(j=0;j<100;j++);
}
void keyScan()
{
if(!key2)
{
delay1ms(300);
if(!key2)
bKey2 = 1;
}
if(!key3)
{
delay1ms(300);
if(!key3)
bKey3 = 1;
}
}
//數碼管顯示溫度值
void displayTemp(uint temp)
{
uchar i;
if(countSet == 0) //顯示實際的測試溫度
{
if(flag == 1) //負溫度
{
dis[0] = 11;
dis[1] = 10;
dis[2] = temp/100;
dis[3] = temp%100/10;
}
else //正溫度
{
dis[0] = 11;
dis[1] = temp/1000;
dis[2] = temp%1000/100;
dis[3] = temp%1000%100/10;
}
}
else if(countSet == 1) //顯示設置的溫度下限
{
dis[0] = 1; //顯示'1'
dis[1] = 10;
dis[2] = SetL/10;
dis[3] = SetL%10;
}
else if(countSet == 2) //顯示設置的溫度上限
{
dis[0] = 2; //顯示'2'
dis[1] = 10;
dis[2] = SetH/10;
dis[3] = SetH%10;
}
else if(countSet == 3) //顯示設置的關機溫度
{
dis[0] = 3; //顯示'3'
dis[1] = 10;
dis[2] = shutDowmH/10;
dis[3] = shutDowmH%10;
}
}
/***********ds18b20延遲子函數（晶振12MHz ）*******/
void delayms(uint x)//延時1ms
{
uint y,z;
for(y=x;y>0;y--)
for(z=110;z>0;z--);
}
/**********ds18b20初始化函數**********************/
void Ds18b20_reset()//DS18B20初始化
{
uchar count;
uint i=2200;
temp_l;
for(count=240;count>0;count--);//延時480us
temp_h;
while(DQ&&(i>0)) i--;
for(count=240;count>0;count--);//延時480us
}
/***********ds18b20讀一個字節**************/
uchar Ds18b20_read()//從DS18B20讀一個字節
{
uchar i,count,dat;
for(i=8;i>0;i--)
{
dat>>=1;
temp_l;
for(count=1;count>0;count--);
temp_h;//此語句必須有，參考datasheet的P15
for(count=1;count>0;count--);
if(DQ)
dat|=0x80;
for(count=30;count>0;count--);
}
return dat;
}
/*************ds18b20寫一個字節****************/
void Ds18b20_write(uchar dat)//向DS18B20寫一個字節
{
uchar count;
uchar i;
for(i=8;i>0;i--)
{
temp_l;
for(count=1;count>0;count--);
if(dat&0x01==0x01)
temp_h;
else
temp_l;
for(count=30;count>0;count--);
temp_h;
dat>>=1;
}
}
/**************讀取ds18b20當前溫度************/
uint ReadTemperature(void)
{
uint dat;
uchar dat1,dat2;//保存讀出的溫度
Ds18b20_reset();
Ds18b20_write(0xcc);
Ds18b20_write(0x44);//發送溫度轉換命令
delayms(1000);//延時1s，等待溫度轉換完成
Ds18b20_reset();
Ds18b20_write(0xcc);
Ds18b20_write(0xbe);//發送讀溫度寄存器命令
dat1=Ds18b20_read();
dat2=Ds18b20_read();
if(dat2 >= 240) //負溫度
{
dat=(~(dat2*256+dat1)+1)*(0.0625*10);
flag = 1;
}
else //正溫度
{
flag = 0;
dat=(dat2*256+dat1)*(0.0625*10);
}
return dat;
}
void main()
{
uint temp;
Timer0_init(); //定時器0初始化
INT0_Init();
EA = 1; //開總中斷
fan = 0;
countSet = 0;
while(1)
{
if(countSet == 0)
temp = ReadTemperature(); //采集DS18B20的溫度值
if(flag == 1) //負溫度
{
ledYellow = 0; //黃燈亮
ledRed = 1;
ledGreen = 1;
displayTemp(temp); //顯示溫度
fan = 0;//風扇關閉
alarm = 0;
}
else
{
if(temp/10 > shutDowmH)
{
dis[0] = 11;
dis[1] = 11;
dis[2] = 11;
dis[3] = 11; //數碼管熄滅
ledYellow = 1; //燈全熄滅
ledRed = 1;
ledGreen = 1;
fan = 0; //風扇停轉
alarm = 0;
}
else if(temp/10 > SetH)
{
displayTemp(temp); //顯示溫度
ledYellow = 1; //指示燈變紅
ledRed = 0;
ledGreen = 1;
fan = 1; //風扇開啟
alarm = 1;
}
else if(temp/10 > SetL)
{
displayTemp(temp); //顯示溫度或者設置
ledYellow = 1; //指示燈變綠
ledRed = 1;
ledGreen = 0;
fan = 1; //風扇開啟
alarm = 0;
}
else
{
displayTemp(temp); //顯示溫度
ledYellow = 0; //指示燈變黃
ledRed = 1;
ledGreen = 1;
fan = 0; //風扇關閉
alarm = 0;
}
}
keyScan();
if(bKey2) //溫度加
{
bKey2 = 0;
if(countSet == 1) //設置低溫
{
if(SetL < SetH)
SetL++;
}
if(countSet == 2) //設置高溫
{
if(SetH < shutDowmH)
SetH++;
}
if(countSet == 3) //設置關機溫度
{
if(shutDowmH < 99)
shutDowmH++;
}
}
if(bKey3) //溫度減
{
bKey3 = 0;
if(countSet == 1) //設置低溫
{
if(SetL > 0)
SetL--;
}
if(countSet == 2) //設置高溫
{
if(SetH > SetL)
SetH--;
}
if(countSet == 3) //設置關機溫度
{
if(shutDowmH > SetH)
shutDowmH--;
}
}
}
}
unsigned char count_5ms = 0;
unsigned int count_5s = 0;
void T0_interrupt(void) interrupt 1
{
TH0 += TH0_temp;
TL0 += TL0_temp;
count_5ms++;
if(count_5ms >= 4)
count_5ms = 0;
P2 = 0X00;
P0 = LED_display[dis[count_5ms]];
P2 = bit_sel[count_5ms];
if(alarm == 1)
{
if(count_5s < 1000)
{
count_5s++;
beep = !beep;
}
}
else
count_5s = 0;
}
/*
外部中斷0服務處理函數，記錄“設置”按鍵按下的次數
*/
void int_int0() interrupt 0
{
countSet++;
if(countSet > 3)
countSet = 0;
}

復制代碼

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