void Encoder_Exe(void)
{
  static char biphase;
  register char tmp1 = 0;
  if(Pin_ENC_F1) tmp1  = 0x40;
  if(Pin_ENC_F2) tmp1 |= 0x80;
  if((tmp1 & 0xC0) != (biphase & 0xC0)) return;
  biphase >>= 2;
  tmp1 |= biphase;
  tmp1 &= 0xF0;
  if(biphase & (1 << 1))
    tmp1 |= (1 << 3);
  biphase = tmp1;
  if(tmp1 >= 0x90) return;
  tmp1 = __swap_nibbles(tmp1);
  if(tmp1 & (1 << 7))
    tmp1 += 0x89;
  switch(tmp1)
  {
  case  2:
  case  4: biphase |= 8; break;
  case 10:
  case 17: biphase &= ~8; break;
  case  8: Keyboard_SetCode(ENC_UP); break;
  case 11: Keyboard_SetCode(ENC_DN); break;
  }
}