基于ZigBee协议栈的DS18B20温度传感器驱动

#ifndef HAL_DS18B20_H

#define HAL_DS18B20_H

#ifdef __cplusplus

extern "C" {

#endif

/** @brief   YTWD GPIO. */

#define HAL_DS18B20_PORT  1 //!< Port1.

#define HAL_DS18B20_PIN   2 //!< Pin2.

/** @brief   DHT11 Data. */

typedef struct  {

    unsigned char ok;   //!< Is ok?

    unsigned char fg;

    unsigned char xs; //!< xiaoshu.

    unsigned char zs; //!< zhengshu.

} halDS18B20Data_t;

/**

 * @fn      halDS18B20Init

 * 

 * @brief	Init. DS18B20.

 */

unsigned char halDS18B20Init(void);   

/**

 * @fn      halDHT11GetData

 * 

 * @brief	Get data from DS18B20.

 *

 * @return  xs&zs value if ok is 1.

 */

halDS18B20Data_t  halDS18B20GetData(void);

#ifdef __cplusplus

}

#endif

#endif /* #ifndef HAL_DS18B20_H */

#include "hal_ds18b20.h"

#include "hal_delay.h"

#include "cc2530_ioctl.h"

#include "hal_lcd.h"

#include <stdio.h>

/* Boolean value. */

#define HAL_DS18B20_FALSE         0

#define HAL_DS18B20_TRUE          1

/* Delay Functions. */   

#define HAL_DS18B20_DELAY_US(x)   delayUsIn32Mhz((x))

#define HAL_DS18B20_DELAY_MS(x)   delayMs(SYSCLK_32MHZ ,(x))

/* Set DS18B20 GPIO mode. */

#define HAL_DS18B20_IO_OUTPUT()         CC2530_IOCTL(HAL_DS18B20_PORT, HAL_DS18B20_PIN, CC2530_OUTPUT)

#define HAL_DS18B20_IO_PULLDOWN()       CC2530_IOCTL(HAL_DS18B20_PORT, HAL_DS18B20_PIN, CC2530_INPUT_PULLDOWN)

#define HAL_DS18B20_IO_PULLUP()         CC2530_IOCTL(HAL_DS18B20_PORT, HAL_DS18B20_PIN, CC2530_INPUT_PULLUP)

/* Set DS18B20 GPIO Level. */ 

#define HAL_DS18B20_IO_SET(port, pin, level) do { \

  if(level) CC2530_GPIO_SET(port, pin);         \

  else CC2530_GPIO_CLEAR(port, pin);            \

} while(0)

#define HAL_DS18B20_IO_SET_LO()  HAL_DS18B20_IO_SET(HAL_DS18B20_PORT, HAL_DS18B20_PIN, 0)

#define HAL_DS18B20_IO_SET_HI()  HAL_DS18B20_IO_SET(HAL_DS18B20_PORT, HAL_DS18B20_PIN, 1)

/*  Get DS18B20 GPIO Status. */

#define HAL_DS18B20_IO_GET(port, pin) CC2530_GPIO_GET(port, pin)

#define HAL_DS18B20_IO()              HAL_DS18B20_IO_GET(HAL_DS18B20_PORT, HAL_DS18B20_PIN)

static uint8_t ReadOneChar(void);

static void WriteOneChar(uint8_t dat);

unsigned char halDS18B20Init(void) 

{ 

    unsigned char x = 0;

    HAL_DS18B20_IO_OUTPUT();

    //DQ 先置高

    HAL_DS18B20_IO_SET_HI();

    HAL_DS18B20_DELAY_US(74);           // 稍延时

    // 发送复位脉冲 

    HAL_DS18B20_IO_SET_LO();

    HAL_DS18B20_DELAY_US(750);          // 延时（>480us)

    // 拉高数据线

    HAL_DS18B20_IO_SET_HI();

    HAL_DS18B20_DELAY_US(50);           // 等待（15~60us)

    HAL_DS18B20_IO_PULLUP();

    x = HAL_DS18B20_IO(); // 用 X 的值来判断初始化有没有成功，18B20 存在的话 X=0，否则 X=1

//    if (x == 0) HalLcdWriteString("finddddd", 3);

//    else HalLcdWriteString("nooooo", 3);

    HAL_DS18B20_DELAY_US(100);

    return x;

}

halDS18B20Data_t halDS18B20GetData(void) 

{

    uint8_t tempL, tempH, xiaoshu1, xiaoshu2;

    halDS18B20Data_t ds18b20Dat = { .ok = HAL_DS18B20_FALSE, .fg = 1 };

    halDS18B20Init();

    HAL_DS18B20_DELAY_US(15);

    WriteOneChar(0xcc);                 // 跳过读序列号的操作 

    WriteOneChar(0x44);                 // 启动温度转换 

    HAL_DS18B20_DELAY_US(1000);         // 转换需要一点时间，延时 

    halDS18B20Init();                   // 初始化

    HAL_DS18B20_DELAY_US(15);

    WriteOneChar(0xcc);                 // 跳过读序列号的操作 

    WriteOneChar(0xbe);                 // 读温度寄存器（头两个值分别为温度的低位和高位）

    tempL = ReadOneChar();              // 读出温度的低位 LSB 

    tempH = ReadOneChar();              // 读出温度的高位 MSB

    if(tempH & 0xf8) // 最高 5 位为 1 时温度是负 

    { 

        tempL = ~tempL; // 补码转换，取反加一 

        tempH = ~tempH+1; 

        ds18b20Dat.fg = 0; // 读取温度为负时 fg=0

    }

    // 温度为负时貌似有问题，后面再改

    ds18b20Dat.zs = tempL/16+tempH*16;          // 整数部分 

    xiaoshu1 = (tempL&0x0f)*10/16;              // 小数第一位 

    xiaoshu2 = (tempL&0x0f)*100/16%10;          // 小数第二位 

    ds18b20Dat.xs = xiaoshu1*10+xiaoshu2;       // 小数两位

    // 进行数据校验

    if ((!ds18b20Dat.fg && ds18b20Dat.zs <= 55) || (ds18b20Dat.fg && ds18b20Dat.zs <= 125))

    {

        ds18b20Dat.ok = HAL_DS18B20_TRUE;

    }

    halDS18B20Init();

    return ds18b20Dat;

}

// 主机数据线先从高拉至低电平 1us 以上，再使数据线升为高电平，从而产生读信号 

static uint8_t ReadOneChar(void) 

{

    uint8_t i = 0; // 每个读周期最短的持续时间为 60us，各个读周期之间必须有 1us 以上的高电平恢复期 

    uint8_t dat = 0;

    for(i = 8; i>0; i--) // 一个字节有 8 位 

    { 

        HAL_DS18B20_IO_OUTPUT();

        dat>>=1;

        HAL_DS18B20_IO_SET_LO();

        HAL_DS18B20_DELAY_US(2);

        HAL_DS18B20_IO_SET_HI();

        HAL_DS18B20_IO_PULLUP();

        HAL_DS18B20_DELAY_US(12);

        if(HAL_DS18B20_IO())

            dat |= 0x80;

        HAL_DS18B20_DELAY_US(50);

    }

    return dat;

}

// 数据线从高电平拉至低电平，产生写起始信号。15us 之内将所需写的位送到数据线上

static void WriteOneChar(uint8_t dat) 

{

    HAL_DS18B20_IO_OUTPUT();

    uint8_t i = 0; 

    for(i = 8; i > 0; i--) // 在 15~60us 之间对数据线进行采样，如果是高电平就写 1，低写 0 发生。 

    { 

        HAL_DS18B20_IO_SET_LO(); // 在开始另一个写周期前必须有 1us 以上的高电平恢复期

        HAL_DS18B20_DELAY_US(1);

        if (dat&0x01) HAL_DS18B20_IO_SET_HI();

        else HAL_DS18B20_IO_SET_LO();

        HAL_DS18B20_DELAY_US(68);

        HAL_DS18B20_IO_SET_HI();

        dat >>= 1;

    }

    HAL_DS18B20_DELAY_US(40);

}