my_ds18b20.c

小弟的毕业设计（ATmega128L+CC2420组建星形网络）的单片机程序

#include "MY_DS18B20.h"
#include <1wire.h>
#include <ds18b20.h>     // DS18b20 Temperature Sensor functions
#include <stdlib.h>
#include <stdio.h>

//============================ DS18B20接PC7脚 ==============================================
// 1 Wire Bus functions
#asm
   .equ __w1_port=0x1B ;PORTA
   .equ __w1_bit=0
#endasm
//==========================================================================================


unsigned char rom_code[MAX_DEVICES][9];     // DS18B20 devices ROM code storage area 
unsigned char devices;  //how many DS18B20 devices are connected to the 1 Wire bus 

char lcd_buffer[33];


/***********************************************
* DS18B20初始化函数
************************************************/ 
void DS18B20_Init(void)
{
    w1_init();          // 1 Wire Bus initialization
}


/***********************************************
* 获取温度函数
************************************************/ 
float GetTemperature(void)
{
    float temp;
    unsigned char temp_char[10];
    
    temp=ds18b20_temperature(0);
    
    ftoa(temp,5,temp_char);     //转换浮点数temp为字符串temp_char,其中第二位参数指定四舍五入保留小数位（最多五位）。
    
    sprintf(lcd_buffer,"%s\xdfC",temp_char);
    //LCD_Clear(); 
    //LCD_write_stringXY(0,0,lcd_buffer);
    
    return temp;
}


/**************************************************************
* 获取总线上18b20个数的函数，并取得18b20的ID号存入rom_code中
**************************************************************/ 
unsigned char Get_ALL_DS18B20_Num(void)
{
    // detect how many DS18B20 devices are connected to the 1 Wire bus 
    devices=w1_search(0xf0,rom_code);
    sprintf(lcd_buffer,"%u DS18B20 Device",devices);
    //LCD_Clear();
    //LCD_write_stringXY(0,0,lcd_buffer);
    delay_ms(2000);
    return  devices; 
} 


/***********************************************
* 显示所有18b20的ID号函数
************************************************/ 
void Show_ALL_DS18B20_ROM_Codes(void)
{
    unsigned char i,j;
    
    // display the ROM codes for each device 
    if (devices)
    {
        for(i=0;i<devices;i++)
        {
            sprintf(lcd_buffer,"#%u Code:",i+1);
            //LCD_Clear();
            //LCD_write_stringXY(0,0,lcd_buffer);
            delay_ms(2000);
            for (j=0;j<8;j++)
            {
                sprintf(lcd_buffer,"%02X ",rom_code[i][j]);
                //LCD_write_string(lcd_buffer);
                if (j==2); 
                    //LCD_set_xy(0,1);
            }
            delay_ms(5000);
        }
    }
    else    // stop here if no devices were found 
    {   
        //while (1);
        sprintf(lcd_buffer,"no devices were found");
        //LCD_Clear();
        //LCD_write_stringXY(0,0,lcd_buffer);
    } 
} 


/***********************************************
* 设置所有18b20的函数
************************************************/ 
void Set_ALL_DS18B20(void)
{
    unsigned char i;
      
    // configure each DS18B20 device for 12 bit temperature measurement resolution 
    for (i=0;i<devices;)
        if (!ds18b20_init(&rom_code[i++][0],20,30,DS18B20_12BIT_RES)) // stop here if init error 
        {
            sprintf(lcd_buffer,"Init error for\ndevice #%u",i);
            //LCD_Clear();
            //LCD_write_stringXY(0,0,lcd_buffer);
            //while (1);
        };
}



/***********************************************
* 获得所有18b20温度的函数
************************************************/ 
void Get_ALL_DS18B20_Temperature(void)
{
    unsigned char i;
    
    float temp;
    unsigned char temp_char[10];

    // measure and display the temperature(s) */       
    for (i=0;i<devices;i++)
    {
        temp=ds18b20_temperature(&rom_code[i][0]);
        ftoa(temp,5,temp_char); 
            
        sprintf(lcd_buffer,"t%u=%s\xdfC",i+1,temp_char); 
        //LCD_Clear();
        //LCD_write_stringXY(0,0,lcd_buffer);
        delay_ms(500);
    }
}