单片机中使用DS18B20温度传感器C语言程序（参考8）

#include "INTRINS.H"
#include "LCD.h"
#define CLR_RI (RI=0)
#define CLR_TI (TI=0)
                                
unsigned char code ID[2][8]={ 0x28,0x1D,0x25,0x1D,0x00,0x00,0x00,0x80,
                              0x28,0x0e,0x9e,0x1c,0x00,0x00,0x00,0x32};
unsigned char currSensorNo=0;

sbit TMDAT   = P1^7;
sbit RUN_LED = P1^6;

/*------------------------------------------------
*
*------------------------------------------------*/
void serial_initial()
{
     TMOD=0X20;
     SCON=0X50;
     PCON=0X00;
     TL1=TH1=0XE8;
     TR1=1;
}

/*------------------------------------------------
*
*------------------------------------------------*/
void send(unsigned char count,unsigned char SEND_Buf[])
{ 
unsigned char i; 
for(i=0;i {
   SBUF=SEND_Buf[i];
   while(!TI);
   CLR_TI;
}
}

/*----------------------------------------------------
*   delay N ms
*----------------------------------------------------*/
void Delay_ms (unsigned int Nms )
{
unsigned char i;
while(Nms--)
for(i=0; i<125; i++) ;
}

/*----------------------------------------------------
*   delay N count
*----------------------------------------------------*/
void Delay_Count (unsigned char Count )
{
    while(Count>0) Count--;
}

/*----------------------------------------------------
*   start Reset Pulse
----------------------------------------------------*/
void tmreset(void)
{
    TMDAT=0;
    Delay_Count(103);

    TMDAT=1;
    Delay_Count(4);
}

/*----------------------------------------------------
*        ACK
*----------------------------------------------------*/
void tmpre(void)
{
    while(TMDAT);
    while(~TMDAT);
    Delay_Count(4);
}

/*----------------------------------------------------
*   Read a bit from 1820
*----------------------------------------------------*/
bit tmrbit(void)
{
    int i=0;
    bit dat;
    TMDAT=0;i++;
        TMDAT=1;i++;i++;
    dat = TMDAT;
        Delay_Count(8);
    return dat;
}

/*----------------------------------------------------
*   Read a byte from 1820
*----------------------------------------------------*/
unsigned char tmrbyte(void)
{
unsigned char i,j,dat=0;

    for(i=1;i<=8;i++)
    {
        j=tmrbit();
        dat=(j<<7)|(dat>>1);
    }
    return dat;
}

/*----------------------------------------------------
*   Read a byte from 1820
*----------------------------------------------------*/
void tmwbyte(unsigned char dat)
{
    signed char   i=0;
    unsigned char j;
    bit testb;

    for(j=1;j<=8;j++)
    {
        testb=dat & 0x01;
        dat = dat>>1;
        if(testb)
        {
            TMDAT=0;
            i++;i++;
            TMDAT=1;
            Delay_Count(8);
        }
        else
        {
            TMDAT=0;
            Delay_Count(8);
            TMDAT=1;
            i++;i++;
        }
    }
}

/*----------------------------------------------------
*   send convert command to 1820
*----------------------------------------------------*/
void tmstart(void)
{
unsigned char i;
tmreset();
    tmpre();
    Delay_ms(1);
/* tmwbyte(0xcc);*/
    tmwbyte(0x55);
    for(i=0;i<8;i++)
    tmwbyte(ID[currSensorNo][i]);
    tmwbyte(0x44);
}

/*----------------------------------------------------
*   Read tempreature from 1820
*----------------------------------------------------*/
unsigned int tmrtemp_all(void)
{
unsigned char a,b;
unsigned int y3;
unsigned char i;

tmreset();
    tmpre();
    Delay_ms(1);
    /*tmwbyte(0xcc);*/
    tmwbyte(0x55);
    for(i=0;i<8;i++)
    tmwbyte(ID[currSensorNo][i]);
          
    tmwbyte(0xbe);
    a = tmrbyte();
    b = tmrbyte();
    y3 = ((unsigned int)b) << 8;
  

    return ((y3+a) & 0x7ff) ;
}

/*----------------------------------------------------
*   Start Test tempreature, All
*
*----------------------------------------------------*/
void Display_AllTemp(void )
{
unsigned int last;
unsigned char i,Dot;

RUN_LED=0;
Part=0;
LED_DISPLAY();
Delay_ms(1);

tmstart();

Delay_ms(800);
last=tmrtemp_all();
RUN_LED=1;

Dot= (last & 0x0f)*6.25 ;
Digit[0]= Dot%10;
Digit[1]=Dot/10;

last=(last>>4) & 0x7f ;
if( (last == 0x7f) )   // erro
{
    for(i=0;i<5;i++) Digit[i]=16; 
}
    else
{
   for(i=2;i<5;i++)
   {
    Digit[i] = last %10;
    last = last/10;
   }
   if(Digit[4]==0)Digit[4]=17;
   Part=1; 
}
Digit[5]=currSensorNo;

         
LED_DISPLAY();

}

/*----------------------------------------------------
*
*----------------------------------------------------*/
/* void Read_Id()
{
   unsigned char i,id[8];
    tmreset();
    tmpre();
    Delay_ms(1);
    tmwbyte(0x33);

   for(i=0;i<8;i++)
    id[i]=tmrbyte();
      send(8,id);
}*/

/*----------------------------------------------------
*
*    Main
*----------------------------------------------------*/
void main(void)
{
unsigned char id[8]={1,2,3,4,5,6,7,8};

serial_initial();
send(8,id);
    for(;;)
    {
   RUN_LED=!RUN_LED;
/*    Read_Id();*/
   TX_C =!TX_C ;
   currSensorNo=(currSensorNo==1)?0:1;
   Display_AllTemp();
      /*Change();*/
   send(6,Digit);
   Delay_ms(1000);
         _nop_();
   }
}