ds18b20.i

使用18B20温度传感器的程序

#line 1 "ds18b20.c" /0
  
#line 1 "ds18b20.h" /0
  
#line 1 "D:\学习软件\KEIL\C51\INC\REG52.H" /0






 
 
 
 
 
 
 sfr P0    = 0x80;
 sfr P1    = 0x90;
 sfr P2    = 0xA0;
 sfr P3    = 0xB0;
 sfr PSW   = 0xD0;
 sfr ACC   = 0xE0;
 sfr B     = 0xF0;
 sfr SP    = 0x81;
 sfr DPL   = 0x82;
 sfr DPH   = 0x83;
 sfr PCON  = 0x87;
 sfr TCON  = 0x88;
 sfr TMOD  = 0x89;
 sfr TL0   = 0x8A;
 sfr TL1   = 0x8B;
 sfr TH0   = 0x8C;
 sfr TH1   = 0x8D;
 sfr IE    = 0xA8;
 sfr IP    = 0xB8;
 sfr SCON  = 0x98;
 sfr SBUF  = 0x99;
 
 
 sfr T2CON  = 0xC8;
 sfr RCAP2L = 0xCA;
 sfr RCAP2H = 0xCB;
 sfr TL2    = 0xCC;
 sfr TH2    = 0xCD;
 
 
 
 
 sbit CY    = PSW^7;
 sbit AC    = PSW^6;
 sbit F0    = PSW^5;
 sbit RS1   = PSW^4;
 sbit RS0   = PSW^3;
 sbit OV    = PSW^2;
 sbit P     = PSW^0;  
 
 
 sbit TF1   = TCON^7;
 sbit TR1   = TCON^6;
 sbit TF0   = TCON^5;
 sbit TR0   = TCON^4;
 sbit IE1   = TCON^3;
 sbit IT1   = TCON^2;
 sbit IE0   = TCON^1;
 sbit IT0   = TCON^0;
 
 
 sbit EA    = IE^7;
 sbit ET2   = IE^5;  
 sbit ES    = IE^4;
 sbit ET1   = IE^3;
 sbit EX1   = IE^2;
 sbit ET0   = IE^1;
 sbit EX0   = IE^0;
 
 
 sbit PT2   = IP^5;
 sbit PS    = IP^4;
 sbit PT1   = IP^3;
 sbit PX1   = IP^2;
 sbit PT0   = IP^1;
 sbit PX0   = IP^0;
 
 
 sbit RD    = P3^7;
 sbit WR    = P3^6;
 sbit T1    = P3^5;
 sbit T0    = P3^4;
 sbit INT1  = P3^3;
 sbit INT0  = P3^2;
 sbit TXD   = P3^1;
 sbit RXD   = P3^0;
 
 
 sbit SM0   = SCON^7;
 sbit SM1   = SCON^6;
 sbit SM2   = SCON^5;
 sbit REN   = SCON^4;
 sbit TB8   = SCON^3;
 sbit RB8   = SCON^2;
 sbit TI    = SCON^1;
 sbit RI    = SCON^0;
 
 
 sbit T2EX  = P1^1;  
 sbit T2    = P1^0;  
 
 
 sbit TF2    = T2CON^7;
 sbit EXF2   = T2CON^6;
 sbit RCLK   = T2CON^5;
 sbit TCLK   = T2CON^4;
 sbit EXEN2  = T2CON^3;
 sbit TR2    = T2CON^2;
 sbit C_T2   = T2CON^1;
 sbit CP_RL2 = T2CON^0;
 
 
#line 1 "ds18b20.h" /0
 
  
#line 1 "D:\学习软件\KEIL\C51\INC\ABSACC.H" /0






 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
#line 24 "D:\学习软件\KEIL\C51\INC\ABSACC.H" /1
  
  
  
  
 
#line 29 "D:\学习软件\KEIL\C51\INC\ABSACC.H" /0
 
 
 
 
 
 
 
#line 2 "ds18b20.h" /0
 
 sbit DQ = P1^0;
 void delay(int us); 
 bit reset18b20(void);
 bit readbit18b20(void);
 unsigned char readbyte18b20(void);
 void writebit18b20(bit databit);
 void writebyte18b20(unsigned char databyte);
#line 1 "ds18b20.c" /0
 
 
 void delay(unsigned char us) 
 {	
 unsigned char k;
 for(k=0;k<us;k++)
 ;
 }
 
 bit reset18b20(void)
 {
 unsigned char i;
 bit exsit;
 DQ=0;
 for(i=0;i<100;i++)
 ;
 
 DQ=1;
 for(i=0;i<12;i++)
 ;
 
 exsit=DQ;
 for(i=0;i<70;i++)
 ;
 
 return(exsit);
 }
 bit readbit18b20(void)
 {
 char i;		
 DQ=0;
 DQ=1;
 for(i=0;i<3;i++)
 ;
 return(DQ);
 }
 unsigned char readbyte18b20(void)
 {
 unsigned char i,value=0,j;
 for(i=0;i<8;i++)
 {	value>>=1;
 if(readbit18b20())
 value|=0x80;
 else
 value&=0x7f;
 
 
 for(j=0;j<5;j++)
 ;
 
 }
 
 return(value);
 }
 
 void writebit18b20(bit databit)
 {		
 unsigned char j;
 DQ=0;		
 for(j=0;j<1;j++)
 ;
 if(databit==1)	
 DQ=1;	
 for(j=0;j<12;j++)
 ;
 
 DQ=1;
 }
 void writebyte18b20(unsigned char databyte)
 {
 unsigned char i,j,temp=0;
 for(i=0;i<8;i++)
 {	
 temp=databyte>>i;
 if(temp&0x01)	
 writebit18b20(1);
 else
 writebit18b20(0);
 
 }
 for(j=0;j<20;j++)
 ;
 
 }