void Encoder_Exe(void)
{
  enum { State0, StateA, StateB, StateAB };
  static char EncPrev = State0;
  static char EncPrevPrev = State0;
  char EncCur = 0;
  if(!Pin_ENC_F1) EncCur  = StateA;
  if(!Pin_ENC_F2) EncCur |= StateB;
  if(EncCur != EncPrev)
  {
    if(EncPrev == StateAB && EncCur != EncPrevPrev )
    {
      if(EncCur == StateB)
        Keyboard_SetCode(ENC_DN);
      else
        Keyboard_SetCode(ENC_UP);
    }
    EncPrevPrev = EncPrev;
    EncPrev = EncCur;
  }
}