复件 main.c

我写的旋转编码器的程序

//-------------------------------------------------------
//             编码电位器检测程序　
//                作者：cacliu
//				      2007.11.1
//A接P3.1,B接P3.2,C接地，并且A,B端均要接一个104的电容到地		  
//否则检测过程中将会产生很多的误码　
//-------------------------------------------------------

#include <reg51.h>
#include "1602.h"

/*=====================码表========================*/
code char tab[]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,
                  0x38,0x39,0x41,0x42,0x43,0x44,0x45,0x46};
unsigned int counter=0,n=0; 
unsigned char DD[2];
void main(void)
{ 
 LcdReset();
 IT0 = 1;                                                
 EX0 = 1;                                           
 EA  = 1;
 Putstr(3,0,"cac cs3310");
 Putstr(3,1,"volume:");
 while(1)
 {
 switch (n)
 {
 case 0:  Putstr(10,1,"mute");	 break;
 case 63: Putstr(10,1,"max ");	 break;
 default :
 			DD[2]=n/100;
   		 	DD[0]=n-10*DD[1];					  
    		DD[1]=(n-100*DD[2])/10;
    		DispOneChar(10,1,' ');
    		DispOneChar(13,1,' ');
	 // if (DD[1]==0)
	//	{
	 //   DispOneChar(11,1,' ');
	//	 DispOneChar(12,1,tab[DD[0]]);
	//	 }
	 //  else
	 // {
    		DispOneChar(11,1,tab[DD[1]]);
			DispOneChar(12,1,tab[DD[0]]);
	//		}
  }                                        
}
}
void delay(unsigned char dly)
{
  unsigned int x;
  while(dly--)
  {														 
    x = 50;
    while(x--);
  }
}
void ISR0()  interrupt 0
{
    if((P3&0x06) == 0x02)
   {
     delay(1); 
     if((P3&0x06) == 0x02)
       if(counter==63)
	   {
	   	   		counter=63;
    	}
		else
		{
		   counter++;
		 }
		n=counter;
   }	 																						  
   else
   {
     delay(1); 
     if((P3&0x06) == 0x00)
    if(counter==0)
	   {
	   		counter=0;
		}
		else
		{
		   counter--;
		 }
		n=counter;
   } 
}