tb1820gengxin.c

使用c编写的一套温控程序,可是通过外部调节来设置上限温度,和下限温度,在正常的范围内,有正常指示灯指示,当超过上限时,超上限温度指示灯指示,当低于下限时,下限温度指示灯指示,也可以通过外围电路连接其他

 /*8M crystal ,temperture detector.The number of controlling 
                               device is DS1820*/
#include<REGX51.h>
#include<absacc.h>
#include<stdio.h>
#include<math.h>
#include<float.h>
#define uchar unsigned char
#define uint unsigned int
#define  toj  P3_7 
unsigned char xiaoshu(uchar i);
 void delay() ;
char code codenumber[]={0x03,0x9f,0x25,0x0c,0x99,0x48,0x40,0x1f,0x00,0x09};
uchar termp1,termp2,set;
static uchar   uptemp,downtemp,j;
 int  tmpt=0;
 void dsreset(void)	   /*初始化*/
  {    unsigned char i;
  start: 
   	  i=200;
      P3_5=0;
      while(i>0) i--;
	  P3_5=1;
      i=20;
      while(i>0) i--;
	  while(P3_5==1) goto start;
	  i=40;
	  while(i>0)
	  { if(P3_5==1) break;
	    i--;
	   }
	   if(i==0)  goto start;
	   else P3_5=1;
	   i=160;
	   while(i>0) i--;
  }
unsigned char tmpread2(void)   /*读一字节*/
  {   unsigned char i, k,dat2;
      bit testb;
     dat2=0;
    for(i=0;i<8;i++)
       {  P3_5=0; 
	       k=4;
		  P3_5=1;
		  while(k>0) k--;
		  testb=P3_5;
		   k=18;
		  while(k>0) k--;
		  dat2=dat2>>1;
		 dat2=testb?dat2|0x80:dat2|0x00;
         }
	return(dat2);
	}
 void tmpwrite(unsigned char dat)	 /*写字节数据*/
 {
     unsigned int i;
	 unsigned char j;
	 bit testb;
	 for(j=0;j<8;j++)
	 {  
	    testb=dat&0x01;
		dat=dat>>1;
		P3_5=0;
		i=1;
		while(i>0) i--;
		P3_5=testb;
		i=4;
		while(i>0) i--;
		P3_5=1;
	  }
	}
 void tmpchange(void)	 /*温度转换*/
  { 
        dsreset();
	 tmpwrite(0xcc);
	 tmpwrite(0x44);
  }
  void showtermp()		/*温度显示*/
  { 	  
          unsigned char ten,xshu;
		  if(termp2&0x80) 
		   { termp1=~termp1+1;
             termp2=~termp2;
			 if(termp1==0)
			 termp2=termp2+1;
			 termp2=termp2*16;
			 termp1=termp1&0xf0;
			 termp1=termp1>>4;
			 tmpt=termp2+termp1;
			 ten=tmpt/10;
			
	    	}
			else{ termp2=termp2*16;
			     xshu=xiaoshu(termp1&0x0f) ;
			 termp1=termp1&0xf0;
			 termp1=termp1>>4;
			 tmpt=termp2+termp1;
			 ten=tmpt/10;
			
			 }
	
		    toj=0;
		 
		  	SBUF=codenumber[ten];
			 ten=tmpt%10; while(!TI) ; TI=0;
			  SBUF=codenumber[ten];
			 while(!TI) ; TI=0; 
			 SBUF=codenumber[xshu];
			 while(!TI); TI=0;
			 toj=1;
			 delay();
			 }
 unsigned char xiaoshu(uchar i)
 { 	 switch(i)
    { case 0 :	;
	  case 1 : 	return( 0);	break;
	  case 2 :return (1);break;
	  case 3 : ;
	  case 4 :return (2) ;	 break;
	  case 5 :return 3 ;break;
	  case 6 :	 ;
	  case 7 : return 4 ;break;
	  case 8 : return 5 ; break;
	  case 9 :	 ;
	  case 10 : return 6 ;break;
	  case 11 :	   ;
	  case 12 :return 7 ; break;
	  case 13 : return 8 ;break;
	  case 14 :	   ;
	  case 15 :return 9 ; break;
	  }
	}

 void delay()
    { unsigned char i,j;
	   for(i=0;i<250;i++)
	for(j=0;j<254;j++);
	}
  void control(void)        /*温度设置*/
  {	 uchar i,l; 
   if(P3_2==0)
     { i=20; 
	    while(i--);
	    if(P3_2==0)
	   { while(P3_2==0);
	    set=1; }
	  
	      }
	  
	  while(set==1)
	  {  
	   if(P3_3==0)
	   {   for(i=0;i<8;i++);
	     if(P3_3==0)
		 {  while(P3_3==0);
	   uptemp++;
	   if(uptemp==85) 
	   uptemp=35;
	   l=0;
	    }
	   }	

	  if(P3_4==0)
	  { for(i=0;i<8;i++);
	   if(P3_4==0)
	 {  while(P3_4==0);
	 downtemp--;
	   if(downtemp==3) 
	   downtemp=30;  
	   l=1; } 
	   } 


	   if(P3_2==0)
     { i=20; 
	    while(i--);
	    if(P3_2==0)
	   { while(P3_2==0);
	    set=0; }
	  
	      }
	  toj=0;
	  switch(l)
	     { case 0 : {   SBUF=codenumber[uptemp/10];
		                while(!TI) ; TI=0;
	                    SBUF=codenumber[uptemp%10]; 
						while(!TI);TI=0;
						SBUF=0xff;
						while(!TI); TI=0; break; }
   	       case 1 : { 	  SBUF=codenumber[downtemp/10];
		                   while(!TI) ; TI=0;
	                    SBUF=codenumber[downtemp%10];
						while(!TI);TI=0;
						SBUF=0xff; 
						while(!TI) ; TI=0;  break; }

	     }
		 toj=1;
	     delay();
		 toj=0;
	     delay();
		 toj=1;
	     }
	   }
	   
	  
  void out(void)
  { if(downtemp<tmpt&&tmpt<uptemp)
     { P1_1=1; P1_0=P1_2=0;	 }
	  else if(tmpt>uptemp||tmpt==uptemp)
	   {  P1_0=1;P1_1=P1_2=0;}
	  else 	{ P1_2=1;P1_0=P1_1=0; }
	  }
  void  main(void)
  {
  unsigned char i;
      SCON=0x00;
	 ES=0;
       set=0;
	  uptemp=40;
	  downtemp=35;
  
     do {  control();
	      P3_5=1;
	      tmpchange();
		  dsreset();
		  tmpwrite(0xcc);
		  tmpwrite(0xbe);
	     termp1=tmpread2();
         termp2=tmpread2();
		 P3_5=0;
		 i=150;
		 while(i>0) i--;
		   showtermp();
		   out();
                }while(1);
	}