/*ADC0831Âà´«µ{¦¡¡A½Ð½Õ¾ãºë±K¥iÅܹqªý,©Î¦³¥[¸Ë¨ä¥¦·P´ú¾¹(¦p¥ú±Ó¹qªý,Àã«×·P´ú¾¹,µ¥µ¥)¡A¬Ý¬Ý·|¦p¦óÅܤÆ*/

#include <reg51.h>
#include <intrins.h>

sbit DQ=P3^3;		//©w¸qDS18B20¸ê®Æ½u

sbit LCD_RS=P1^0;	//LCM±µ¸}©w¸q
sbit LCD_RW=P1^1;
sbit LCD_E=P1^2;
#define LCD_Data P2


void WriteDataLCD(char WDLCD);
void WriteCommandLCD(char WCLCD);
void LCDInit(void);
void write_byte(char dat);
unsigned char read_byte(void);
void init_DS18B20(void);
void delay(int t);   // «Å§i©µ¿ð¨ç¦¡
void delay_us(int t)
{
	while(t--);
}

unsigned char ad0831read(void);	//©w¸q¸Ó¨ç¼Æ¬°Åª¨úADC0831ªº¸ê®Æ
char code digit[] = "0112334456678899";  //¼Æ­È0~15¹ïÀ³¨ì0.0~0.9«×


void main(void)     //µ{¦¡¶}©l
{
	
   unsigned char temp_low,temp_high,tmp;
   int  temperature,temp_d;		//Àx¦s·Å«×ª­È
   delay_us(20000);		//­YLCM¤ÏÀ³¸ûºC¡A«Øij¹q·½±Ò°Ê«á»Ý¥ýµ¥¤@¬q®É¶¡¦A³W¹ºLCM¡ALCM¤~¥i¥¿±`°Ê§@
   LCDInit(); 				//LCMªì©l¤Æ
   WriteCommandLCD(0x80+0x06);		//´å¼Ð²¾¨ì²Ä¤@¦æ¶}ÀY´å¼Ð²¾¨ì²Ä6®æ
   WriteDataLCD(0xdf);   
   WriteDataLCD('C'); //¥ýÅã¥Ü¡CC²Å¸¹
   while(1)
    {
        WriteCommandLCD(0x80);		//´å¼Ð²¾¨ì²Ä¤@¦æ¶}ÀY
        init_DS18B20();
        write_byte(0xcc); 
        write_byte(0x44); 
        delay(1000);           //µ¥·Å«×Âà´«§¹²¦,¦Ü¤Ö­n750 ms

        init_DS18B20();
        write_byte(0xcc); 
        write_byte(0xbe); 
        temp_low = read_byte();
        temp_high = read_byte();
        temperature=temp_high*256 + temp_low;  //±N2¦¸Åª¨ìªº¼Æ­ÈÂন¹ê»Ú·Å«×

        if (temperature < 0)
          { 
            WriteDataLCD('-');      //Åã¥Ü·Å«×¬°­t
            temperature = -temperature; //±N·Å«×Âন¥¿­È
           }
        else WriteDataLCD(' '); // ·Å«×¥¿®É¸ÓÄæ¦ìÅã¥ÜªÅ¥Õ

        temp_d = temperature/16;   //¨ú¥X·Å«×¾ã¼Æ³¡¤À,«e12¬°­ì¬°¾ã¼Æ­È, «á4¦ì¤¸¬°¤p¼Æ
        tmp = temp_d/100;       //¨ú¥X¦Ê¦ì¼Æ
        if (tmp == 0)
          WriteDataLCD(' ');  //¨ú¥X¦Ê¦ì¼Æ¬O0, «hÅã¥ÜªÅ¥Õ
        else
          WriteDataLCD('1');  //¨ú¥X¦Ê¦ì¼Æ¤£¬O0, «hÅã¥Ü1,¦]¤W­­¥u·|¶q¨ì125«×
        tmp = temp_d%100;
        WriteDataLCD(tmp/10+0x30);  //¨ú¥X¤Q¦ì¼Æ¡A¨Ã§ï¦¨ASCII½X¡AÅã¥Ü©óLCD
        WriteDataLCD(tmp%10+0x30);	//¨ú¥X­Ó¦ì¼Æ¡A¨Ã§ï¦¨ASCII½X¡AÅã¥Ü©óLCD
        WriteDataLCD('.');              //Åã¥Ü¤p¼ÆÂI
        WriteDataLCD(digit[temperature%16]);  //Åã¥Ü¤p¼Æ­È


    }
}


void write_byte(char dat)  //¼g¸ê®Æ¨ìds18b20, ±q³Ì§C¦ì¤¸¶}©l¼g
 {
   unsigned char i;
   bit testb;
   for(i=0;i<8;i++)
     {
       testb=dat&0x01;   //Ū¨ú³Ì§C¦ì¤¸
       dat=dat>>1;   //±N¸ê®Æ¥k²¾¤@¦ì¤¸, µ¥«Ý¤U¦¸§PÂ_³Ì§C¦ì¤¸
	   DQ = 0;
       delay_us(10);   //«ùÄò10 us,ªì©l°T¸¹
	   DQ = testb;
       delay_us(20);   //«ùÄò20 us,µ¥«Ý¼g¤Jds18b20
       DQ = 1;
       delay_us(35);   //«ùÄò35 us,µ¥«Ýds18b20¦^´_ 
     }
 }


unsigned char read_byte(void) //±qds18b20Ū¨ú¤@¦ì¤¸²Õ°T¸¹, ±q³Ì§C¦ì¤¸¶}©lŪ
{							
    unsigned char i,j,tmp;
    tmp = 0; //

	for(i=0;i<8;i++)
     {
       DQ=0;
       delay_us(2);  //°_©l°T¸¹, «ùÄò 2 us
       DQ=1;
       delay_us(10);	//µ¥«Ý10 us«á¦AŪ°T¸¹°T¸¹
       j = DQ;        //§âŪ¨ìªº1¦ì¤¸¸ê®Æ©ñ¨ì j
       tmp=(j<<7)|(tmp>>1);   //Ū¥Xªº¸ê®Æ³Ì§C¦ì¦b³Ì«e­±¡A­ì¨Óªº¸ê®Æ¦V¥k²¾¤@­Ó¦ì¤¸	
       delay_us(50);	 	//«ùÄò50 us,µ¥«Ýds18b20¦^´_
     }
    return tmp;
}

void init_DS18B20(void)
 {
    DQ = 0;
    delay_us(500);
    DQ = 1;
    delay_us(500);
 }




void delay(int t)	//	©µ¿ð¨ç¼Æ¶}©l 
{
   int i,j;				//	«Å§i¾ã¼ÆÅܼÆi,j 
   for (i=0;i<t;i++)		//	­p¼Æt¦¸,©µ¿ðt x 1ms 
     for (j=0;j<800;j++);	//	­p¼Æ800¦¸¡A©µ¿ð1ms 
}


//¼g¸ê®Æ¨ìLCD°Æµ{¦¡
void WriteDataLCD(char WDLCD)
{
 LCD_Data = WDLCD;
 LCD_RS = 1;
 LCD_RW = 0;
 LCD_E = 1; //²£¥Í­t½t
 delay_us(100); //©µ¿ðµ¥°T¸¹Ã­©w
 LCD_E = 0; 
 delay_us(100); //©µ¿ðµ¥°T¸¹³B¸Ì§¹²¦
}

//¼g«ü¥O¨ìLCD°Æµ{¦¡
void WriteCommandLCD(char WCLCD) //BuysC¬°0®É©¿²¤¦£ÀË´ú
{
 LCD_Data = WCLCD;
 LCD_RS = 0;
 LCD_RW = 0; 
 LCD_E = 1;
 delay_us(100); //©µ¿ðµ¥°T¸¹Ã­©w
 LCD_E = 0;
 delay_us(100);  //©µ¿ðµ¥°T¸¹³B¸Ì§¹²¦
}


void LCDInit(void) //LCMªì©l¤Æ
{
 WriteCommandLCD(0x38); //³]©wLCD¤¶­±8¦ì¤¸¡A2¦æ¡A5*7¦r«¬
 WriteCommandLCD(0x06); // Åã¥Ü´å¼Ð²¾°Ê³]¸m
 WriteCommandLCD(0x0C); // Åã¥Ü¶}¤Î´å¼Ð³]¸m
 WriteCommandLCD(0x01); //Åã¥Ü²M°£
 delay_us(5000);
}