HAL_STM32_DS18B20开发

1.设置一个如PA0作为DS18B20模块接口

2.添加下面2个文件，注意程序已经集成us延时

ds18b20.c

#include "ds18b20.h"

static inline void delay_ms(uint32_t delay)
{
    HAL_Delay(delay);
}

#define CPU_FREQUENCY_MHZ 72                // CPU主频，根据实际进行修改
static void delay_us(uint32_t delay)
{
    int last, curr, val;
    int temp;

    while (delay != 0)
    {
        temp = delay > 900 ? 900 : delay;
        last = SysTick->VAL;
        curr = last - CPU_FREQUENCY_MHZ * temp;
        if (curr >= 0)
        {
            do
            {
                val = SysTick->VAL;
            }
            while ((val < last) && (val >= curr));
        }
        else
        {
            curr += CPU_FREQUENCY_MHZ * 1000;
            do
            {
                val = SysTick->VAL;
            }
            while ((val <= last) || (val > curr));
        }
        delay -= temp;
    }
}

//复位DS18B20
void DS18B20_Rst(void)       
{                 
    DS18B20_IO_OUT(); //SET PA0 OUTPUT
    DS18B20_DQ_OUT=0; //拉低DQ
    delay_us(750);    //拉低750us
    DS18B20_DQ_OUT=1; //DQ=1 
    delay_us(15);     //15US
}
//等待DS18B20的回应
//返回1:未检测到DS18B20的存在
//返回0:存在
uint8_t DS18B20_Check(void)
{   
    uint8_t retry=0;
    DS18B20_IO_IN();//SET PA0 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;
}
//从DS18B20读取一个位
//返回值：1/0
uint8_t DS18B20_Read_Bit(void)              // read one bit
{
    uint8_t data;
    DS18B20_IO_OUT();//SET PA0 OUTPUT
    DS18B20_DQ_OUT=0; 
    delay_us(2);
    DS18B20_DQ_OUT=1; 
    DS18B20_IO_IN();//SET PA0 INPUT
    delay_us(12);
    if(DS18B20_DQ_IN)data=1;
    else data=0;     
    delay_us(50);           
    return data;
}
//从DS18B20读取一个字节
//返回值：读到的数据
uint8_t DS18B20_Read_Byte(void)    // read one byte
{        
    uint8_t i,j,dat;
    dat=0;
    for (i=1;i<=8;i++) 
    {
        j=DS18B20_Read_Bit();
        dat=(j<<7)|(dat>>1);
    }                            
    return dat;
}
//写一个字节到DS18B20
//dat：要写入的字节
void DS18B20_Write_Byte(uint8_t dat)
 {             
    uint8_t j;
    uint8_t testb;
    DS18B20_IO_OUT();//SET PA0 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);                          
        }
    }
}
//开始温度转换
void DS18B20_Start(void)// ds1820 start convert
{                                          
    DS18B20_Rst();       
    DS18B20_Check();     
    DS18B20_Write_Byte(0xcc);// skip rom
    DS18B20_Write_Byte(0x44);// convert
} 
//初始化DS18B20的IO口 DQ 同时检测DS的存在
//返回1:不存在
//返回0:存在         
uint8_t DS18B20_Init(void)
{
    DS18B20_Rst();
    return DS18B20_Check();
}  
//从ds18b20得到温度值
//精度：0.1C
//返回值：温度值 （-550~1250） 
short DS18B20_Get_Temp(void)
{
    uint8_t temp;
    uint8_t 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;//温度为负  
    }else temp=1;//温度为正            
    tem=TH; //获得高八位
    tem<<=8;    
    tem+=TL;//获得底八位
    tem=(float)tem*0.625;//转换     
    if(temp)return tem; //返回温度值
    else return -tem;    
} 

ds18b20.h

#ifndef __DS18B20_H
#define __DS18B20_H 

#include "main.h"
#include "stm32f1xx_hal.h"       
//#include "delay.h"

#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2))
#define MEM_ADDR(addr)  *((volatile unsigned long  *)(addr))
#define BIT_ADDR(addr, bitnum)   MEM_ADDR(BITBAND(addr, bitnum))

#define GPIOA_ODR_Addr    (GPIOA_BASE+12)
#define GPIOB_ODR_Addr    (GPIOB_BASE+12)
#define GPIOC_ODR_Addr    (GPIOC_BASE+12)
#define GPIOD_ODR_Addr    (GPIOD_BASE+12)
#define GPIOE_ODR_Addr    (GPIOE_BASE+12)
#define GPIOF_ODR_Addr    (GPIOF_BASE+12)
#define GPIOG_ODR_Addr    (GPIOG_BASE+12)

#define GPIOA_IDR_Addr    (GPIOA_BASE+8)
#define GPIOB_IDR_Addr    (GPIOB_BASE+8)
#define GPIOC_IDR_Addr    (GPIOC_BASE+8)
#define GPIOD_IDR_Addr    (GPIOD_BASE+8)
#define GPIOE_IDR_Addr    (GPIOE_BASE+8)
#define GPIOF_IDR_Addr    (GPIOF_BASE+8)
#define GPIOG_IDR_Addr    (GPIOG_BASE+8)

#define PAout(n)   BIT_ADDR(GPIOA_ODR_Addr,n)
#define PAin(n)    BIT_ADDR(GPIOA_IDR_Addr,n)

#define PBout(n)   BIT_ADDR(GPIOB_ODR_Addr,n)
#define PBin(n)    BIT_ADDR(GPIOB_IDR_Addr,n)

#define PCout(n)   BIT_ADDR(GPIOC_ODR_Addr,n)
#define PCin(n)    BIT_ADDR(GPIOC_IDR_Addr,n)

#define PDout(n)   BIT_ADDR(GPIOD_ODR_Addr,n)
#define PDin(n)    BIT_ADDR(GPIOD_IDR_Addr,n)

#define PEout(n)   BIT_ADDR(GPIOE_ODR_Addr,n)
#define PEin(n)    BIT_ADDR(GPIOE_IDR_Addr,n)

#define PFout(n)   BIT_ADDR(GPIOF_ODR_Addr,n)
#define PFin(n)    BIT_ADDR(GPIOF_IDR_Addr,n)

#define PGout(n)   BIT_ADDR(GPIOG_ODR_Addr,n)
#define PGin(n)    BIT_ADDR(GPIOG_IDR_Addr,n)


//IO方向设置
#define DS18B20_IO_IN()  {GPIOA->CRL&=0XFFFFFFF0;GPIOA->CRL|=8<<0;}
#define DS18B20_IO_OUT() {GPIOA->CRL&=0XFFFFFFF0;GPIOA->CRL|=3<<0;}

//IO操作函数
#define    DS18B20_DQ_OUT PAout(0) //数据端口    PA0
#define    DS18B20_DQ_IN  PAin(0)  //数据端口    PA0 
       
uint8_t DS18B20_Init(void);            //初始化DS18B20
short DS18B20_Get_Temp(void);        //获取温度
void DS18B20_Start(void);            //开始温度转换
void DS18B20_Write_Byte(uint8_t dat);//写入一个字节
uint8_t DS18B20_Read_Byte(void);    //读出一个字节
uint8_t DS18B20_Read_Bit(void);        //读出一个位
uint8_t DS18B20_Check(void);        //检测是否存在DS18B20
void DS18B20_Rst(void);                //复位DS18B20
#endif

程序进行调用

使用温度=DS18B20_Get_Temp()；进行调用数值，可见精度达到要求了