key_scan.c

QH_MCU_V1.1单片机C源码. 内含实验程序 这是修改版.

#include <reg51.h>
#include <rtx51tny.h>

#define key_scan 1
#define uchar unsigned char
uchar temp = 0;
extern uchar key = 0;

void scan(void) _task_ key_scan{

while(1)
{  
  P2 = 0x00;
  P0 = 0x00;
  P2 = 0x10;
  P0 = 0xf5;
  P1 = 0xFF;
  temp = P1;
  temp &= 0xFF;
  if(temp !=0xFF)
  {
    os_wait (K_IVL, 0, 0); 
    temp = P1;
    temp &= 0xFF;
    if(temp !=0xFF) 
    {
       temp = P1;
       temp &= 0xFF;

       switch(temp)
       {
         case 0xfe:
              key = 2;
              break;
         case 0xfd:
              key = 3;
              break;
         case 0xfb:
              key = 4; 
              break;
         case 0xf7:
              key = 5;
              break;
         case 0xef:
              key = 6;
              break;
         case 0xdf:
              key = 7;
              break;
         case 0xbf:
              key = 8; 
              break;
         case 0x7f:
              key = 9;
              break;
         default:
              key = 00;
              break;
       }

     }

   }
//   os_send_signal(2);
   P2 = 0x00; 
   P0 = 0x00;
   P2 = 0x10;
   P0 = 0xf6;
   P1 = 0xFF;
   temp = P1;
   temp &= 0xFF;
   if(temp !=0xFF)
   {
      os_wait (K_IVL, 0, 0); 
      temp = P1;
      temp &= 0xFF;
      if(temp !=0xFF) 
      {
         temp = P1;
         temp &= 0xFF;

         switch(temp)
         {
            case 0xfe:
                 key = 10; 
	             break;
            case 0xfd:
                 key = 11;
	             break;
            case 0xfb:
                 key = 12;
	             break;
            case 0xf7:
                 key = 13; 
	             break;
            case 0xef:
                 key = 14;
	             break;
            case 0xdf:
                 key = 15;
	             break;
            case 0xbf:
                 key = 16;
	             break;
            case 0x7f:
                 key = 17;
	             break;
            default:
                 key = 00;
	             break;
           }

        }
     }
    P2 = 0x00;
	P0 = 0x00;
	os_wait (K_IVL, 100, 0); 
  }
}