#include"includes.h"

void dlms()					     //延時(shí)1ms
{
   unsigned int i;
   for(i=0;i<1900;i++);

}

unsigned char kbscan()
{
	unsigned char sccode,recode,temp;
	PRT3CF=0xff;
	P3=0xf0;	          //發(fā)全0行掃描碼，列線輸入
	PRT3CF=0x00;	                          
	temp=P3;
	if((temp&0xf0)!=0xf0)					  
	{
	   dlms();
	   temp=P3;
	   if((temp&0xf0)!=0xf0)
	   {
	      sccode=0xfe;
		  while((sccode&0x10)!=0)
		  {
		    PRT3CF=0xff;
		    P3=sccode;
			PRT3CF=0x00;
			temp=P3;
			if((temp&0xf0)!=0xf0)
			{
			   recode=(temp&0xf0)|0x0f;
			   return((~sccode)+(~recode));
		    }
			else
			sccode=(sccode<<1)|0x01;
		  }
	    }
	 }
	 return(0);



}