DS18B20+52单片机+温度报警+4位数码管显示程序

ID:356418 · 发表于 2018-6-25 09:31

#include <reg52.h>
#include<intrins.h>
#define TH0HIGH 0xe1
#define TL0LOWW 0xa7
#define LOW 0
#define HIGH 1
#define DIS_DAT P0
#define DIS_POS P2 //数码管只用到低四位
#define NOP() _nop_()
#define false 0
#define FALSE 0
#define true 1
#define TRUE 1
#define uint unsigned int
extern unsigned char idata flag; //定义外部变量，温度正负标志
uint HNum = 50,LNum = 10; //报警温度的高低值
uint Tem;
void delay_16us();
void SetLowTem();
void SetHighTem();
void initalarm();
void alarm();
void delay_ms(uint timer);
typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
typedef signed char s8;
typedef signed int s16;
typedef signed long s32;
typedef bit BOOL;
void delay_16us(u16 us);
void init_various(void);
void dynamic_display(void);
float set_temp_data(void);
u8 ds18b20_reset(void);
void ds18b20_write_byte(u8 wByte);
u8 ds18b20_read_byte(void);
u16 ds18b20_get_temp(void);
BOOL b10msEvent;
BOOL b500msEvent;
sbit k1 = P3^0;
sbit k2 = P3^1;
sbit k3 = P3^2;
sbit k4 = P3^3;
sbit led1 = P1^0;
sbit led2 = P1^1;
sbit led3 = P1^2;
sbit buzzer = P3^7;
sbit DQ_PIN = P3^6;//管脚定义
code u8 float_tab[16] = {0,1,1,2,3,3,4,4,5,6,6,7,8,8,9,9};//小数表
code u8 DisCode[] = {0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0xff, 0xbf};
u8 DisNum[4] = {0x0a, 0x0a, 0x00, 0x00};
u8 DisPosition = 0;
void delay_16us(u16 us) //(14 + 16 * us) 微秒
{
while(--us);
}
void init_c51(void)
{
TMOD = 0x01;
TH0 = TH0HIGH;
TL0 = TL0LOWW;
ET0 = 1;
TR0 = 1;
}
void init_various(void)
{
EA = 0;
init_c51();
ds18b20_reset();
ds18b20_get_temp();
EA = 1;
}
void dynamic_display(void)
{
static u8 DisPinOn = 0x01;
DisPinOn <<= 1;//DisPinON位选
if(DisPinOn == 0x10)
{
DisPosition = 0;
DisPinOn = 0x01;
}
DIS_DAT = 0xff;
DIS_POS = DisPinOn;
DIS_DAT = DisCode[DisNum[DisPosition++]];
if(DisPinOn == 0x04)
DIS_DAT &= 0x7f;
}
void SetHighTem()//函数：设置高温温度报警值函数
{
HNum = 50;
if(k1 == 0) //按键消抖
delay_ms(10);
if(k1 == 0)
{ while(!k1); //等待按键释放
while(1)
{
dynamic_display();
if(k1 == 0)
delay_ms(50); //按键消抖
if(k1 == 0)
{ while(!k1); //等待按键释放
SetLowTem(); //设置低温报警温度
break;
}
if(k2 == 0)
delay_ms(50); //按键消抖
if(k2 == 0)
{ while(!k2); //等待按键释放
HNum++;
}
if(k3 == 0)
delay_ms(50); //按键消抖
if(k3 == 0)
{ while(!k3); //等待按键释放
HNum--;
}
if(k4 == 0)
delay_ms(50); //按键消抖
if(k4 == 0)
{ while(!k4); //等待按键释放
break;
}
}
}
dynamic_display();
}
void SetLowTem()//函数：设置低温温度报警值函数
{
while(1)
{
dynamic_display();
if(k2 == 0)
delay_ms(50); //按键消抖
if(k2 == 0)
{ while(!k2); //等待按键释放
LNum++;
}
if(k3 == 0)
delay_ms(50); //按键消抖
if(k3 == 0)
{ while(!k3); //等待按键释放
LNum--;
}
if(k4 == 0)
delay_ms(50); //按键消抖
if(k4 == 0)
{ while(!k4); //等待按键释放
break;
}
}
}
float set_temp_data(void)
{
u16 TempData;
float Temp;
u8 Negative;
s8 i;
float j;
TempData = ds18b20_get_temp(); //度温度数据
/* 小于零 */
if(TempData & 0xf000)
{
TempData = ~TempData + 1;
TempData &= 0x0fff;
Negative = 1;
}
/* 大于零 */
else
{
Negative = 0;
}
Temp = (TempData >> 4) * 10; //温度读数乘以精度（0.0625），显示小数点一位，所以乘以10
j=Temp;
Temp = Temp + float_tab[(TempData & 0x000f)] + 0.5; //加上小数部分，四舍五入所以加0.5
TempData = Temp;
for(i=3; i>=0; i--)//循环4次，分别显示小，个，十，百
{
DisNum[i] = TempData % 10;
TempData /= 10;
}
for(i=0; i<2; i++)
{
if(DisNum[i] != 0)
{
break;
}
else
{
DisNum[i] = 0x0a; //前面为0不显示
}
}
/* 显示负号 */
if(Negative == 1)
{
for(i=2; i>=0; i--)
{
if(DisNum[i] == 0x0a)
{
DisNum[i] = 0x0b; //'-'
break;
}
}
}
return j;
}
u8 ds18b20_reset(void)
{
DQ_PIN = HIGH;
delay_16us(1);
DQ_PIN = LOW;
delay_16us(30); //延时600us
DQ_PIN = HIGH;
delay_16us(5); //延时80us
if(!DQ_PIN)
{
delay_16us(30); //延时420us
return 1;
}
else
return 0;
}
void ds18b20_write_byte(u8 wByte)
{
u8 i;
for(i=0; i<8; i++)
{
DQ_PIN = LOW;
NOP();
NOP();
NOP();
NOP();
NOP();
NOP();
NOP();
DQ_PIN = wByte & 0x01;
NOP();
NOP();
NOP();
NOP();
NOP();
DQ_PIN = HIGH;
NOP();
NOP();
NOP();
wByte >>= 1;
}
}
u8 ds18b20_read_byte(void)
{
u8 rByte;
u8 i;
for(i=0; i<8; i++)
{
DQ_PIN = LOW;
NOP();
NOP();
rByte >>= 1;
NOP();
NOP();
NOP();
NOP();
NOP();
NOP();
DQ_PIN = HIGH;
NOP();
NOP();
NOP();
NOP();
NOP();
NOP();
NOP();
if(DQ_PIN)
rByte |= 0x80;
NOP();
NOP();
NOP();
NOP();
NOP();
NOP();
NOP();
}
DQ_PIN = HIGH;
return rByte;
}
u16 ds18b20_get_temp(void)
{
u16 Temp;
if(ds18b20_reset() == 0) //复位
return 0;
ds18b20_write_byte(0xcc); //忽略ROM
ds18b20_write_byte(0x44); //发送温度转化命令
delay_16us(30);
if(ds18b20_reset() == 0) //再次复位
return 0;
ds18b20_write_byte(0xcc); //忽略ROM
ds18b20_write_byte(0xbe);
Temp = ds18b20_read_byte();
Temp |= ds18b20_read_byte() << 8;
return Temp;
}
void main()
{
initalarm();
init_various();
while(1)
{
alarm();
SetHighTem();
if(b10msEvent)
{
b10msEvent = false;
dynamic_display(); //显示
if(b500msEvent)
{
b500msEvent = false;
set_temp_data(); //读温度
}
}
}
}
void timer0(void) interrupt 1
{
static u8 SecCount = 0;
TH0 = TH0HIGH;
TL0 = TL0LOWW;
b10msEvent = true; //10毫秒中断
if(++SecCount == 50)
{
SecCount = 0;
b500msEvent = true; //1秒到时
}
}
void delay_ms(uint timer)
{
uint i,j;
for(i=0; i<timer; i++)
for(j=0; j<110; j++);
}
void initalarm()//led和蜂鸣器初始化
{
led1 = 0;
led2 = 0;
led3 = 0;
buzzer = 1;
}
void alarm()//函数：led和蜂鸣器控制
{
Tem = set_temp_data();
if(Tem > HNum)
{
led2 = 1;
led1 = 0;
led3 = 0;
buzzer = 0; //蜂鸣器工作
}
else if(Tem < LNum)
{
led3 = 1;
led1 = 0;
led2 = 0;
buzzer = 0;
}
else
{
led1 = 1;
led2 = 0;
led3 = 0;
buzzer = 1;
}
}

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