tickisr.c

用DS18B20和51单片机组合成的温度测量仪器

#include <e51.h>
#include <reg51.h>
#define OFF  0
#define ON  1
uchar Tick=0;
uchar Key;
extern   uchar DisBuf[4] ;
extern  unsigned int  ReadTemperature(void);
void tickISR () interrupt   1
{
   static   uchar  LedPos =0;
   static  uchar Key_Sta=OFF;
   static  uchar  Key_time=0;
   TH0=-2000/256;
   TL0=-2000%256;
   LedPos++;//Led show pos
   if(LedPos==4)   LedPos=0;
   Tick++;//tick 
   if(Tick>=50)  Tick=0;//1s
   DisBuf[LedPos]|=(LedPos<<4);
   P2= DisBuf[LedPos];
   if((P3&0x0c)!=0x0c&&Key_Sta==OFF)   {Key_Sta=ON; Key=P3&0x0c;}
   if(Key_Sta==ON)   Key_time++;
   //if(Key_time==1&&Key_Sta==ON)   Key=P3&0x0c;
   if((P3&0x0c)==0x0c&&Key_Sta==ON)   
           {
           // P17=~P17;
		    Key_Sta=OFF;
			Key_time=0;
          //  if(Key_time>49&&Key==0x04){Key|=0x40;Key_time=0;}
            Key|=0x80;
            }
}