keyscan.h

用共阴极数码管做的密码锁,可修改密码

#ifndef _keyscan_H__
#define __keyscan_H__

uchar keyscan()    //键盘扫描
{    
   
	P1=0xfe;
	temp=P1;
	temp=temp&0xf0;
	while(temp!=0xf0)
		{
		delay(20);
		temp=P1;
		temp=temp&0xf0;
		while(temp!=0xf0)
		{						  
			temp=P1;
		switch(temp)  
	   {
		case 0xee:num=15;su=0;esc=1;break;
		case 0xde:num=9;su=0;break;
		case 0xbe:num=5;su=0;break;
		case 0x7e:num=1;su=0;break;
        default : break;
		}
        while(temp!=0xf0)
		{
		 temp=P1;
		 temp=temp&0xf0;
		}
	  }
	}

	P1=0xfd;
	temp=P1;
	temp=temp&0xf0;
	while(temp!=0xf0)
	{
		delay(20);
		temp=P1;
		temp=temp&0xf0;
		while(temp!=0xf0)
		{
			temp=P1;
		switch(temp)
		{			 
		 case 0xed:num=10;su=0;del=1;break;
		 case 0xdd:num=0;su=0;break;
		 case 0xbd:num=6;su=0;break;
		 case 0x7d:num=2;su=0;break;
         default : break;
		}
        while(temp!=0xf0)
		{
		 temp=P1;
		 temp=temp&0xf0;
		}
	  }
	}
	
	P1=0xfb;
	temp=P1;
	temp=temp&0xf0;
		while(temp!=0xf0)
	{
		delay(20);
		temp=P1;
		temp=temp&0xf0;
		while(temp!=0xf0)
		{
			temp=P1;	   
		switch(temp)
		{
		 case 0xeb:num=11;su=0;ent=1;break;
		 case 0xdb:num=14;su=0;alter=1;break;
		 case 0xbb:num=7;su=0;break;
		 case 0x7b:num=3;su=0;break;
         default : break;
		}
         while(temp!=0xf0)
		{
		 temp=P1;
		 temp=temp&0xf0;
		}
	  }
	}

	P1=0xf7;
	temp=P1;
	temp=temp&0xf0;
	while(temp!=0xf0)
	{
		delay(20);
		temp=P1;
		temp=temp&0xf0;
		while(temp!=0xf0)
		{
			temp=P1;
		switch(temp) 
		{		   
		case 0xe7:num=12;su=0;open=1;break;
		case 0xd7:num=15;su=0;break;
		case 0xb7:num=8;su=0;break;
		case 0x77:num=4;su=0;break;
        default : break;
		}
	while(temp!=0xf0)
		{
		 temp=P1;
		 temp=temp&0xf0;
		}
      }
    }
su=1;
return num;

}



#endif