DS18B20读取温度（带小数）

由于DS18B20对时间精度要求很高，所以在写读取温度之前一定要改时序

1. 单总线延时函数

//单总线延时函数
void Delay_OneWire(unsigned int t)
{t*=12;          //t改成t*12while(t--);
}

2. 读取温度（整数）

unsigned char read_temperature1()
{unsigned char temp1;unsigned char low,high;Init_DS18B20();Write_DS18B20(0xcc);Write_DS18B20(0x44);Delay_OneWire(200);Init_DS18B20();Write_DS18B20(0xcc);Write_DS18B20(0xbe);Delay_OneWire(200);low = Read_DS18B20();            //先读低，再读高high = Read_DS18B20();temp1=high<<4;       temp1|=(low&0xf0)>>4;return temp1;
}

3. 读取温度（带小数）

float read_temperature2()
{float temp2;                    //**注意带小数，使用float型**unsigned int temp;          //16位unsigned char low,high;Init_DS18B20();Write_DS18B20(0xcc);Write_DS18B20(0x44);Delay_OneWire(200);Init_DS18B20();Write_DS18B20(0xcc);Write_DS18B20(0xbe);Delay_OneWire(200);low = Read_DS18B20();high = Read_DS18B20();temp = high&0x0f;temp = temp<<8|low;temp2 = temp*0.0625;   //最小精度0.0625return temp2;
}

4. 主函数里的变换

uchar temp1;
uint temp2;
float temp_value;
bit temp_flag;
void main()
{CloseFucker();Timer0Init();while(1){if(temp_flag){temp1 = read_temperature1();              //读取整数温度值temp_value = 10*read_temperature2();  //float型读取带小数温度值，乘10把小数提取temp2 = (uint)temp_value;            //化为整型可以取余temp_flag=0;}                ShowTemp();}
}

代码

main.c

******************************************************************************
* 文件名：读取温度（带整数和小数）
* 描  述：
* 作  者：思索与猫
* 日  期:  19/3/8
* 备  注：左边：整数      右边：带小数
*
******************************************************************************
#include<stc15f2k60s2.h>
#include<onewire.h>
#define uchar unsigned char
#define uint unsigned intuchar code duan[] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x00,0x40,0x039,0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xEF};  //带小数0~9
uchar dispbuff[8];
uchar temp1;     //注意数据类型
uint temp2;
float temp_value;
bit temp_flag;
//function
void CloseFucker();
void Timer0Init();
void Display();
void ShowTemp();void main()
{CloseFucker();Timer0Init();while(1){if(temp_flag){temp1 = read_temperature1();temp_value = 10*read_temperature2();temp2 = (uint)temp_value;temp_flag=0;}               ShowTemp();}
}
void ShowTemp()
{dispbuff[0] = temp1/10;dispbuff[1] = temp1%10;dispbuff[2] = 12;dispbuff[3] = 10;dispbuff[4] = temp2/100;dispbuff[5] = temp2/10%10+13;dispbuff[6] = temp2%10;dispbuff[7] = 12;
}
void Display()
{static uchar index = 0;P2 = (P2&0x1f)|0xe0;P0 = 0xff;P2 = P2&0x1f;P2 = (P2&0x1f)|0xc0;P0 = 1<<index;P2 = P2&0x1f;P2 = (P2&0x1f)|0xe0;P0 = ~duan[dispbuff[index]];P2 = P2&0x1f;index++;index &= 0x07;
}
void T0_time() interrupt 1
{static uint temp_count = 0;TL0 = 0x40;       TH0 = 0xA2;    Display();if(++temp_count == 500){temp_count=0;temp_flag=1;}
}
void Timer0Init()       //12Mhz 2ms
{AUXR |= 0x80;     TMOD &= 0xF0;      TL0 = 0x40;        TH0 = 0xA2;        TF0 = 0;       TR0 = 1;   ET0=1;EA=1;
}
void CloseFucker()
{P2 = (P2&0x1f)|0xa0;P0 = 0xa0;P2 = P2&0x1f;
}

onewire.h

#ifndef _ONEWIRE_H
#define _ONEWIRE_H#include "stc15f2k60s2.h"#define OW_SKIP_ROM 0xcc
#define DS18B20_CONVERT 0x44
#define DS18B20_READ 0xbe//pin
sbit DQ = P1^4;//function
void Delay_OneWire(unsigned int t);
void Write_DS18B20(unsigned char dat);
bit Init_DS18B20(void);
unsigned char Read_DS18B20(void);unsigned char read_temperature1();
float read_temperature2();
#endif

onewire.c

#include "onewire.h"void Delay_OneWire(unsigned int t)
{t*=12;while(t--);
}bit Init_DS18B20(void)
{bit initflag = 0;DQ = 1;Delay_OneWire(12);DQ = 0;Delay_OneWire(80); DQ = 1;Delay_OneWire(10); initflag = DQ;    Delay_OneWire(5);return initflag;
}void Write_DS18B20(unsigned char dat)
{unsigned char i;for(i=0;i<8;i++){DQ = 0;DQ = dat&0x01;Delay_OneWire(5);DQ = 1;dat >>= 1;}Delay_OneWire(5);
}unsigned char Read_DS18B20(void)
{unsigned char i;unsigned char dat;for(i=0;i<8;i++){DQ = 0;dat >>= 1;DQ = 1;if(DQ){dat |= 0x80;}        Delay_OneWire(5);}return dat;
}unsigned char read_temperature1()  //读取温度（整数）
{unsigned char temp1;unsigned char low,high;Init_DS18B20();Write_DS18B20(0xcc);Write_DS18B20(0x44);Delay_OneWire(200);Init_DS18B20();Write_DS18B20(0xcc);Write_DS18B20(0xbe);Delay_OneWire(200);low = Read_DS18B20();high = Read_DS18B20();temp1=high<<4;temp1|=(low&0xf0)>>4;return temp1;
}float read_temperature2()   //读取温度（小数）
{float temp2;unsigned int temp;unsigned char low,high;Init_DS18B20();Write_DS18B20(0xcc);Write_DS18B20(0x44);Delay_OneWire(200);Init_DS18B20();Write_DS18B20(0xcc);Write_DS18B20(0xbe);Delay_OneWire(200);low = Read_DS18B20();high = Read_DS18B20();temp = high&0x0f;temp = temp<<8|low;temp2 = temp*0.0625;return temp2;
}

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DS18B20读取温度（带小数）

1. 单总线延时函数

2. 读取温度（整数）

3. 读取温度（带小数）

4. 主函数里的变换

代码

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