4-4键盘-2.txt

在单片机应用设计中

 uchar code scancode[4]={0xfe,0xfd,0xfb,0xf7};   //键盘扫描码


///键盘扫描程序////
keyscan()
 {  int i;
  uchar h,n,m;
  for(i=0;i<4;i++)
  { P1=scancode[i];
    if((P1&0xf0)!=0xf0)
	 { delay1ms(10);
	   if((P1&0xf0)!=0xf0)
	   { h=P1&0xf0;
	   n=scancode[i]&0x0f;
       m=n|h;
       return(m);
	   }
      }
   }
   return(0);
  }


//////////////////////

p=keyscan();

	 switch(p)
	{
		case 0x77:
		{	
		 break;
		}

        case 0x7b:
		{
               break;	
		}

	    case 0x7d:
		{
                  break;	
		}

		case 0x7e:
		{	
		break;
		}

		case 0xb7:
		{	
		break;
		}

		case 0xbb:
		{	
		break;
		}

           case 0xbd:
	   {	
		break;
		}

		case 0xbe:
	   {	
		break;
		}

		case 0xd7:
	    {	
		break;
		}

		case 0xdb:
		{	
		break;
		}

		case 0xdd:
		{	
		break;
		}

		case 0xde:
	    {	
		break;
		}

		case 0xe7:
		{	
		break;
		}

		case 0xeb:
	        { 
		break;
		}

		case 0xed:
		{	
		break;
		}


		case 0xee:
		{
			
		break;
		}

		default:{break;}
      }