1.c

这是一个结合Proteus和51单片机实现的一个按键加速实例。以验证

#include <reg51.h>
#include <stdio.h>
#define uint unsigned int
#define uchar unsigned char 
#define qdshi 200
#define ljshi 10
void delay(uchar b)
  {uint i,j;
   for(i=0;i<b;i++)
    for(j=0;j<125;j++);
   }
keyprocess(unsigned char p)
 {uchar flog;
  if(flog==p)
    {p+=0x1f;
	 flog=19;}
  switch(p)
	 { case 0x60:
	   P2=0XFE;
	   delay(255);
       flog=p;
		 break;
	   case 0xa0:
	    P2=0xfD;
		delay(255);
		flog=p;
		break;
	 case 0xc0:
       P2=0xfC;
	   delay(255);
	   flog=p;
	 break;
	
	
	 case 0x7f:
	 case 0xbf:
	 case 0xdf:
       P2=0xf0;
	   delay(255);
	   flog=19;
	   break;
	 default:
	 break;
	 }
    
    }


bit keyflag;
uchar keyswith=1;
void key()
 {static uchar keycounter;
  uchar keyvalue;

  keyvalue=P1;

  if(keyvalue==0xe0)
   {keycounter=0;
    keyflag=0;
	return;
   }
  else if(keyflag)
   {keycounter++;
    if(qdshi==keycounter)
	 {keycounter-=ljshi;
	  keyprocess(keyvalue);
	 }
	else{return;}
   }
   else{
    delay(10);
	P1|=0xe0;
	keyvalue=P1;
    keyvalue=~keyvalue;
    keyvalue=keyvalue&0xe0;
	if(!keyvalue)
	 {keycounter=0;
    keyflag=0;
	return;
    }

   keyflag=1;
   keyprocess(keyvalue);
   }
   }


 void main()
   {for(;;)
    key();
	}