THEMA:

void HandleMenu()
{
  static int  _nMenu = 0;
  static bool _bSetDisplay = true;
  uint8_t c = jetiEx.GetJetiboxKey();
 
  // 224 0xe0 : // RIGHT
  // 112 0x70 : // LEFT
  // 208 0xd0 : // UP
  // 176 0xb0 : // DOWN
  // 144 0x90 : // UP+DOWN
  // 96 0x60 : // LEFT+RIGHT
 
  // right
  if( c == 0xe0 && _nMenu < 2 )
  {
    _nMenu++;
    _bSetDisplay = true;
  }
 
  // left
  if( c == 0x70 )
  { 
    if( _nMenu > 0 )
    {
      _nMenu--;
      _bSetDisplay = true;
    }
    else
    {
      jetiEx.SetJetiboxExit(); // todo does not exit menu
      return;
    }
  }
 
  if( !_bSetDisplay )
    return;
 
  switch( _nMenu )
  {
  case 0: 
    jetiEx.SetJetiboxText( JetiExProtocol::LINE1, " RCT Jeti Tools" );
    jetiEx.SetJetiboxText( JetiExProtocol::LINE2, "  Test Sensor" );
    break;
  case 1: 
    jetiEx.SetJetiboxText( JetiExProtocol::LINE1, "Menu 1 - Line 1" );
    jetiEx.SetJetiboxText( JetiExProtocol::LINE2, "Menu 1 - Line 2" );
    break;
  case 2: 
    jetiEx.SetJetiboxText( JetiExProtocol::LINE1, "Menu 2 - Line 1" );
    jetiEx.SetJetiboxText( JetiExProtocol::LINE2, "Menu 2 - Line 2" );
    break;
  }
  _bSetDisplay = false;
}