tb1820.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
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()
  { 	  
          unsigned char ten;
		  if(set==1)
		  return;
		  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;
	    	P0=codenumber[ten];
			ten=tmpt%10;
			  P2=codenumber[ten]; 
		 	 P3_7=0;
		    }
			else{ termp2=termp2*16;
			 termp1=termp1&0xf0;
			 termp1=termp1>>4;
			 tmpt=termp2+termp1;
			 ten=tmpt/10;
			 P3_7=1;  
		    	P0=codenumber[ten];
			 ten=tmpt%10;
			  P2=codenumber[ten];
			 
			 
			 }

		   }
		   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||set==1)
     { if(P3_2==0)
	  { i=20; 
	    while(i--);
	    if(P3_2==0)
	   { while(P3_2==0);
	   set++;
	   if(set==2)
	    set=0; } }
	  
	  if(set==1)
	  {  
	   if(P3_3==0)
	   {   for(i=0;i<102;i++);
	     if(P3_3==0)
		 {  while(P3_3==0);
	   uptemp++;
	   if(uptemp==85) 
	   uptemp=35;
	   P0=codenumber[uptemp/10];
	  P2=codenumber[uptemp%10];
	   
	    }
	   }
	   
	   	
	  if(P3_4==0)
	  { for(i=0;i<100;i++);
	   if(P3_4==0)
	 {  while(P3_4==0);
	 downtemp--;
	   if(downtemp==3) 
	   downtemp=30;
	    	P3_7=0;
	   
	   P0=codenumber[downtemp/10];
	   
	   
	   P2=codenumber[downtemp%10]; 

	    delay();
	   delay();
	   P0=0xff;
	   P2=0xff;
	   delay();
	   
	   P3_7=1; } 
	   } l++;
	   
	    if(l==2)
	     l=0;
	  
	  
	   }
	   }
	   }
  void out(void)
  { if(downtemp<tmpt&&tmpt<uptemp)
     P1=0x0F2;
	  else if(tmpt>uptemp||tmpt==uptemp)
	   P1=0x04;
	  else 	P1=0x01;
	  }
  void  main(void)
  {
  unsigned char i;
      SCON=0x00;
	  P3_7=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);
	}