int voltage_division[6] = { //screen has 4 divisions, 31 pixels each (125 pixels of height)
  550, //fullscreen 3.3V peak-peak
  500,
  375,
  180,
  100,
  50
};


/*each sample represents 1us (1Msps),
   thus, the time division is the number
   of samples per screen division
*/
float time_division[9] = { //screen has 4 divisions, 60 pixel each (WIDTH pixel of width)
  10,
  25,
  50,
  100,
  250,
  500,
  1000,
  2500,
  5000
};
//,   //1Mhz    35ms of data (of 50ms possible)
//  10000,  //100khz  70ms/500ms
//  25000,  //100khz  175ms/500ms of data
//  50000,  //100khz  350ms/500ms of data
//  100000  //50khz   700ms/1000ms of data
//};

void menu_handler() {
  button();
}

void button()
{
  if (btnok == 1 || btnbk == 1 || btnpl == 1 || btnmn == 1)
  {
    menu_action = true;
  }
  if (menu == true)
  {
    if (set_value)
    {
      switch (opt)
      {
      case Vdiv:
        if (btnpl == 1)
        {
          volts_index++;
          if (volts_index >= sizeof(voltage_division) / sizeof(*voltage_division))
          {
            volts_index = 0;
          }
          btnpl = 0;
        }
        else if (btnmn == 1)
        {
          volts_index--;
          if (volts_index < 0)
          {
            volts_index = sizeof(voltage_division) / sizeof(*voltage_division) - 1;
          }
          btnmn = 0;
        }

        v_div = voltage_division[volts_index];
        break;

      case Sdiv:
        if (btnmn == 1)
        {
          tscale_index++;
          if (tscale_index >= sizeof(time_division) / sizeof(*time_division))
          {
            tscale_index = 0;
          }
          btnmn = 0;
        }
        else if (btnpl == 1)
        {
          tscale_index--;
          if (tscale_index < 0)
          {
            tscale_index = sizeof(time_division) / sizeof(*time_division) - 1;
          }
          btnpl = 0;
        }

        s_div = time_division[tscale_index];
        break;

      case Offset:
        if (btnmn == 1)
        {
          offset += 0.1 * (v_div * 4) / 3300;
          btnmn = 0;
        }
        else if (btnpl == 1)
        {
          offset -= 0.1 * (v_div * 4) / 3300;
          btnpl = 0;
        }

        if (offset > 3.3)
          offset = 3.3;
        if (offset < -3.3)
          offset = -3.3;

        break;

      case TOffset:
        if (btnpl == 1)
        {
          toffset += 0.1 * s_div;
          btnpl = 0;
        }
        else if (btnmn == 1)
        {
          toffset -= 0.1 * s_div;
          btnmn = 0;
        }

        break;

      default:
        break;
      }
      if (btnbk == 1)
      {
        set_value = 0;
        btnbk = 0;
        btnok = 0;
      }
    }
    else
    {
      if (btnpl == 1)
      {
        opt++;
        if (opt > Single)
        {
          opt = 1;
        }
        //Serial.print("option : ");
        //Serial.println(opt);
        btnpl = 0;
      }
      if (btnmn == 1)
      {
        opt--;
        if (opt < 1)
        {
          opt = 9;
        }
        //Serial.print("option : ");
        //Serial.println(opt);
        btnmn = 0;
      }
      if (btnbk == 1)
      {
        hide_menu();
        btnbk = 0;
      }
      if (btnok == 1)
      {
        switch (opt)
        {
        case Autoscale:
          auto_scale = !auto_scale;
          break;

        case Vdiv:
        case Sdiv:
        case Offset:
        case TOffset:
          set_value = true;
          break;

        case Stop:
          stop = !stop;
          //Serial.print("Stop : ");
          //Serial.println(stop);
          set_value = false;
          break;

        case Single:
          single_trigger = true;
          set_value = false;
          break;

        case Reset:
          offset = 0;
          v_div = 550;
          s_div = 10;
          tscale_index = 0;
          volts_index = 0;
          break;

        case Probe:
          break;

        case Mode:
          digital_wave_option++;
          if (digital_wave_option > 2)
            digital_wave_option = 0;
          break;

        case Filter:
          current_filter++;
          if (current_filter > 3)
            current_filter = 0;
          break;

        default:
          break;
        }

        btnok = 0;
      }
    }
  }
  else
  {
    if (btnok == 1)
    {
      opt = 1;
      show_menu();
      btnok = 0;
    }
    if (btnbk == 1)
    {
      if (info == true)
      {
        hide_all();
      }
      else
      {
        info = true;
      }
      btnbk = 0;
    }
    if (btnpl == 1)
    {
      volts_index++;
      if (volts_index >= sizeof(voltage_division) / sizeof(*voltage_division))
      {
        volts_index = 0;
      }
      btnpl = 0;
      v_div = voltage_division[volts_index];
    }
    if (btnmn == 1)
    {
      tscale_index++;
      if (tscale_index >= sizeof(time_division) / sizeof(*time_division))
      {
        tscale_index = 0;
      }
      btnmn = 0;
      s_div = time_division[tscale_index];
    }
  }
}

void hide_menu()
{
  menu = false;
}

void hide_all()
{
  menu = false;
  info = false;
}

void show_menu()
{
  menu = true;
}

String strings_vdiv()
{
  return "";
}

String strings_sdiv()
{
  return "";
}

String strings_offset()
{
  return "";
}

String strings_toffset()
{
  return "";
}

String strings_freq()
{
  return "";
}

String strings_peak()
{
  return "";
}

String strings_vmax()
{
  return "";
}

String strings_vmin()
{
  return "";
}

String strings_filter()
{
  return "";
}