Readkey

ID:246403 · 發(fā)表于 2017-11-6 08:26

void Readkey (void)
{          P2=0xff;
            Row2=0;
            keybuf=(P2&0x0f^0x0f)<<4;
            P2=0xff;
            Row1=0;
            keybuf=(P2&0x0f^0x0f^keybuf)<<4;
            P2=0xff;
            Row0=0;
            keybuf=(P2&0x0f^0x0f^keybuf)<<2;
            P1=0xff;
            keybuf=((P1&0xc0^0xc0)>>6)^keybuf;
            if(keybuf==lastkey)  T20ms=4;
else
{  --T20ms;
   if(T20ms)
   keybuf=lastkey;
   else  T20ms=4;
}
   key=keybuf;
   key=key&(key^lastkey);
   lastkey=keybuf;
      key1=key&0x003f;
      key2=key>>6;
}

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