fgdata/Input/Event/GoFlight/MFR.xml

<PropertyList>

  <name>GoFlight MFR</name>
  <debug-events type="bool">true</debug-events>

<nasal>
  <open>
    <![CDATA[
    var activeChannel = 0;
    var activeNode = props.globals.getNode("/input/goflight/mfr/active", 1);
    var standbyNode = props.globals.getNode("/input/goflight/mfr/standby-mhz", 1);
    var selectedNode = props.globals.getNode("/input/goflight/mfr/selected-mhz", 1);

    var updateActive = func(newActive)
    {
      activeChannel = newActive;
      activeNode.setValue(activeChannel);

      printlog("info", "Active channel is now:" ~ activeChannel);
      var prefix = "/instrumentation/nav[" ~ activeChannel ~ "]/frequencies/";

      standbyNode.unalias();
      standbyNode.alias(props.globals.getNode(prefix ~ "standby-mhz"));

      selectedNode.unalias();
      selectedNode.alias(props.globals.getNode(prefix ~ "selected-mhz"));
    }

    var cycleActive = func() {
      activeChannel = activeChannel + 1;
      if (activeChannel >= 2) activeChannel = 0;
      updateActive();
    }

    # map decimal digits 0..9 to standard 7-segment LCD pattern
    var translateDigitToSevenSegment = [0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f];

    var formatFrequency = func(freqMhz)
    {
      var s = sprintf("%.3f", freqMhz);
      var padCount = 6 - size(s);
      var r = "";

      while (padCount > 0) {
        r ~= chr(0);
        padCount -=1;
      }

      for (var i=0; i < size(s); i += 1) {
        if (s[i] == `.`) {
          # set the high bit to correspond to the decimal
          var lastIndex = size(r) - 1;
          r[lastIndex] = r[lastIndex] + 0x80;
        } else {
          var digitCode = s[i] - `0`;
          r ~= chr(translateDigitToSevenSegment[digitCode]);
        }
      }

      return r;
    }

    var standbyAlphanumeric = func() {
      return formatFrequency(standbyNode.getValue());
    }

    var selectedAlphanumeric = func() {
      return formatFrequency(selectedNode.getValue());
    }

    var ledState = func()
    {
      if (activeChannel == 1) return chr(0x04);
      return chr(0x2);
    }

    updateActive(0);
      ]]>
  </open>
</nasal>

  <event>
    <name>rel-dial</name>
    <binding>
      <command>property-adjust</command>
      <property>/input/goflight/mfr/standby-mhz</property>
      <min type="double">108.0</min>
      <max type="double">117.95</max>
      <wrap type="bool">true</wrap>
    </binding>
    <interpolater>
      <entry><ind>0</ind><dep>0</dep></entry>
      <entry><ind>1</ind><dep>1</dep></entry>
      <entry><ind>2</ind><dep>2</dep></entry>
      <entry><ind>3</ind><dep>4</dep></entry>
      <entry><ind>4</ind><dep>8</dep></entry>
    </interpolater>
  </event>

<event>
  <name>rel-dial-1</name>
  <binding>
    <command>property-adjust</command>
    <property>/input/goflight/mfr/standby-mhz</property>
    <factor type="double">0.025</factor>
    <min type="double">108.0</min>
    <max type="double">117.95</max>
    <wrap type="bool">true</wrap>
  </binding>
  <interpolater>
    <entry><ind>0</ind><dep>0</dep></entry>
    <entry><ind>1</ind><dep>1</dep></entry>
    <entry><ind>2</ind><dep>2</dep></entry>
    <entry><ind>3</ind><dep>4</dep></entry>
    <entry><ind>4</ind><dep>8</dep></entry>
  </interpolater>
</event>

<report>
  <report-id type="int">3</report-id>
  <watch>/input/goflight/mfr/active</watch>
  <!-- we can't watch the /input/goflight/mfr property, because it's an alias
    and value changed notifications don't propogate. Bah. -->
  <watch>/instrumentation/nav[0]/frequencies/selected-mhz</watch>
  <watch>/instrumentation/nav[1]/frequencies/selected-mhz</watch>
  <nasal-function>selectedAlphanumeric</nasal-function>
</report>

<report>
  <report-id type="int">5</report-id>
  <watch>/input/goflight/mfr/active</watch>
  <!-- we can't watch the /input/goflight/mfr property, because it's an alias
    and value changed notifications don't propogate. Bah. -->
  <watch>/instrumentation/nav[0]/frequencies/standby-mhz</watch>
  <watch>/instrumentation/nav[1]/frequencies/standby-mhz</watch>
  <nasal-function>standbyAlphanumeric</nasal-function>
</report>

<report>
  <report-id type="int">7</report-id>
  <watch>/input/goflight/mfr/active</watch>
  <nasal-function>ledState</nasal-function>
</report>
<!--
  <event>
    <name>led-misc</name>
    <setting>
      <value>4</value>
      <condition>
        <equals>
          <property>/input/goflight/mfr/active</property>
          <value>0</value>
        </equals>
      </condition>
    </setting>
    <setting>
      <value>7</value>
      <condition>
        <not-equals>
          <property>/input/goflight/mfr/active</property>
          <value>0</value>
        </not-equals>
      </condition>
    </setting>
  </event>

  <event>
    <name>led-misc-1</name>
    <setting>
      <value>7</value>
      <condition>
        <equals>
          <property>/input/goflight/mfr/active</property>
          <value>1</value>
        </equals>
      </condition>
    </setting>
    <setting>
      <value>0</value>
      <condition>
        <not-equals>
          <property>/input/goflight/mfr/active</property>
          <value>1</value>
        </not-equals>
      </condition>
    </setting>
  </event>
-->
  <event>
    <desc>Transfer Button</desc>
    <name>button-1</name>
    <binding>
      <command>property-swap</command>
      <property>/input/goflight/mfr/standby-mhz</property>
      <property>/input/goflight/mfr/selected-mhz</property>
    </binding>
  </event>

  <event>
    <desc>Nav 1 Button</desc>
    <name>button-2</name>
    <binding>
      <command>nasal</command>
      <script>updateActive(0)</script>
    </binding>
  </event>

  <event>
    <desc>Nav 2 Button</desc>
    <name>button-3</name>
    <binding>
      <command>nasal</command>
      <script>updateActive(1)</script>
    </binding>
  </event>

</PropertyList>