IntelligentPiggery/stm32/HARDWARE/DS18B20/ds18b20.c

#include "ds18b20.h"
#include "delay.h"	
//////////////////////////////////////////////////////////////////////////////////	 
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD>ѧϰʹ<EFBFBD>ã<EFBFBD>δ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>κ<EFBFBD><EFBFBD><EFBFBD>;
//ALIENTEK<EFBFBD><EFBFBD>ӢSTM32<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
//DS18B20<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>	   
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD>@ALIENTEK
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̳:www.openedv.com
//<EFBFBD>޸<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:2012/9/12
//<EFBFBD>汾<EFBFBD><EFBFBD>V1.0
//<EFBFBD><EFBFBD>Ȩ<EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ؾ<EFBFBD><EFBFBD><EFBFBD>
//Copyright(C) <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӿƼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>޹<EFBFBD>˾ 2009-2019
//All rights reserved									  
//////////////////////////////////////////////////////////////////////////////////
  


//<EFBFBD><EFBFBD>λDS18B20
void DS18B20_Rst(void)	   
{                 
	DS18B20_IO_OUT(); 	//SET PG11 OUTPUT
    DS18B20_DQ_OUT=0; 	//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>DQ
    delay_us(750);    	//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>750us
    DS18B20_DQ_OUT=1; 	//DQ=1 
	delay_us(15);     	//15US
}
//<EFBFBD>ȴ<EFBFBD>DS18B20<EFBFBD>Ļ<EFBFBD>Ӧ
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>1:δ<EFBFBD><EFBFBD><EFBFBD>⵽DS18B20<EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD>
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>0:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
u8 DS18B20_Check(void) 	   
{   
	u8 retry=0;
	DS18B20_IO_IN();	//SET PG11 INPUT	 
    while (DS18B20_DQ_IN&&retry<200)
	{
		retry++;
		delay_us(1);
	};	 
	if(retry>=200)return 1;
	else retry=0;
    while (!DS18B20_DQ_IN&&retry<240)
	{
		retry++;
		delay_us(1);
	};
	if(retry>=240)return 1;	    
	return 0;
}
//<EFBFBD><EFBFBD>DS18B20<EFBFBD><EFBFBD>ȡһ<EFBFBD><EFBFBD>λ
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD>1/0
u8 DS18B20_Read_Bit(void) 	 
{
    u8 data;
	DS18B20_IO_OUT();	//SET PG11 OUTPUT
    DS18B20_DQ_OUT=0; 
	delay_us(2);
    DS18B20_DQ_OUT=1; 
	DS18B20_IO_IN();	//SET PG11 INPUT
	delay_us(12);
	if(DS18B20_DQ_IN)data=1;
    else data=0;	 
    delay_us(50);           
    return data;
}
//<EFBFBD><EFBFBD>DS18B20<EFBFBD><EFBFBD>ȡһ<EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD>
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
u8 DS18B20_Read_Byte(void)     
{        
    u8 i,j,dat;
    dat=0;
	for (i=1;i<=8;i++) 
	{
        j=DS18B20_Read_Bit();
        dat=(j<<7)|(dat>>1);
    }						    
    return dat;
}
//дһ<EFBFBD><EFBFBD><EFBFBD>ֽڵ<EFBFBD>DS18B20
//dat<EFBFBD><EFBFBD>Ҫд<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD>
void DS18B20_Write_Byte(u8 dat)     
 {             
    u8 j;
    u8 testb;
	DS18B20_IO_OUT();	//SET PG11 OUTPUT;
    for (j=1;j<=8;j++) 
	{
        testb=dat&0x01;
        dat=dat>>1;
        if (testb) 
        {
            DS18B20_DQ_OUT=0;	// Write 1
            delay_us(2);                            
            DS18B20_DQ_OUT=1;
            delay_us(60);             
        }
        else 
        {
            DS18B20_DQ_OUT=0;	// Write 0
            delay_us(60);             
            DS18B20_DQ_OUT=1;
            delay_us(2);                          
        }
    }
}
//<EFBFBD><EFBFBD>ʼ<EFBFBD>¶<EFBFBD>ת<EFBFBD><EFBFBD>
void DS18B20_Start(void) 
{   						               
    DS18B20_Rst();	   
	DS18B20_Check();	 
    DS18B20_Write_Byte(0xcc);	// skip rom
    DS18B20_Write_Byte(0x44);	// convert
} 

//<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>DS18B20<EFBFBD><EFBFBD>IO<EFBFBD><EFBFBD> DQ ͬʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>DS<EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD>
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>1:<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>0:<EFBFBD><EFBFBD><EFBFBD><EFBFBD>    	 
u8 DS18B20_Init(void)
{
 	GPIO_InitTypeDef  GPIO_InitStructure;
 	
 	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);	 //ʹ<EFBFBD><EFBFBD>PORTG<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD> 
	
 	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;				//PORTG.11 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; 		  
 	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 	GPIO_Init(GPIOA, &GPIO_InitStructure);

 	GPIO_SetBits(GPIOA,GPIO_Pin_11);    //<EFBFBD><EFBFBD><EFBFBD><EFBFBD>1

	DS18B20_Rst();

	return DS18B20_Check();
}  
//<EFBFBD><EFBFBD>ds18b20<EFBFBD>õ<EFBFBD><EFBFBD>¶<EFBFBD>ֵ
//<EFBFBD><EFBFBD><EFBFBD>ȣ<EFBFBD>0.1C
//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD>¶<EFBFBD>ֵ <EFBFBD><EFBFBD>-550~1250<EFBFBD><EFBFBD> 
short DS18B20_Get_Temp(void)
{
    u8 temp;
    u8 TL,TH;
	short tem;
    DS18B20_Start ();  			// ds1820 start convert
    DS18B20_Rst();
    DS18B20_Check();	 
    DS18B20_Write_Byte(0xcc);	// skip rom
    DS18B20_Write_Byte(0xbe);	// convert	    
    TL=DS18B20_Read_Byte(); 	// LSB   
    TH=DS18B20_Read_Byte(); 	// MSB  
	    	  
    if(TH>7)
    {
        TH=~TH;
        TL=~TL; 
        temp=0;					//<EFBFBD>¶<EFBFBD>Ϊ<EFBFBD><EFBFBD>  
    }else temp=1;				//<EFBFBD>¶<EFBFBD>Ϊ<EFBFBD><EFBFBD>	  	  
    tem=TH; 					//<EFBFBD><EFBFBD><EFBFBD>ø߰<EFBFBD>λ
    tem<<=8;    
    tem+=TL;					//<EFBFBD><EFBFBD><EFBFBD>õװ<EFBFBD>λ
    tem=(float)tem*0.625;		//ת<EFBFBD><EFBFBD>     
	if(temp)return tem; 		//<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>¶<EFBFBD>ֵ
	else return -tem;    
}