Add decode of Mode-A transonder (Squawk) code

plugins/channelrx/demodadsb/adsbdemodgui.cpp

@@ -61,16 +61,17 @@
 #define ADSB_COL_LONGITUDE      11
 #define ADSB_COL_CATEGORY       12
 #define ADSB_COL_STATUS         13
-#define ADSB_COL_REGISTRATION   14
+#define ADSB_COL_SQUAWK         14
-#define ADSB_COL_COUNTRY        15
+#define ADSB_COL_REGISTRATION   15
-#define ADSB_COL_REGISTERED     16
+#define ADSB_COL_COUNTRY        16
-#define ADSB_COL_MANUFACTURER   17
+#define ADSB_COL_REGISTERED     17
-#define ADSB_COL_OWNER          18
+#define ADSB_COL_MANUFACTURER   18
-#define ADSB_COL_OPERATOR_ICAO  19
+#define ADSB_COL_OWNER          19
-#define ADSB_COL_TIME           20
+#define ADSB_COL_OPERATOR_ICAO  20
-#define ADSB_COL_FRAMECOUNT     21
+#define ADSB_COL_TIME           21
-#define ADSB_COL_CORRELATION    22
+#define ADSB_COL_FRAMECOUNT     22
-#define ADSB_COL_RSSI           23
+#define ADSB_COL_CORRELATION    23
+#define ADSB_COL_RSSI           24
 
 const char *Aircraft::m_speedTypeNames[] = {
     "GS", "TAS", "IAS"
@@ -617,6 +618,7 @@ void ADSBDemodGUI::handleADSB(
         ui->adsbData->setItem(row, ADSB_COL_LONGITUDE, aircraft->m_longitudeItem);
         ui->adsbData->setItem(row, ADSB_COL_CATEGORY, aircraft->m_emitterCategoryItem);
         ui->adsbData->setItem(row, ADSB_COL_STATUS, aircraft->m_statusItem);
+        ui->adsbData->setItem(row, ADSB_COL_SQUAWK, aircraft->m_squawkItem);
         ui->adsbData->setItem(row, ADSB_COL_REGISTRATION, aircraft->m_registrationItem);
         ui->adsbData->setItem(row, ADSB_COL_COUNTRY, aircraft->m_countryItem);
         ui->adsbData->setItem(row, ADSB_COL_REGISTERED, aircraft->m_registeredItem);
@@ -957,12 +959,27 @@ void ADSBDemodGUI::handleADSB(
         {
             // Aircraft status
             int st = data[4] & 0x7;   // Subtype
-            int es = (data[5] >> 5) & 0x7; // Emergency state
             if (st == 1)
+            {
+                int es = (data[5] >> 5) & 0x7; // Emergency state
+                int modeA =  ((data[5] << 8) & 0x1f00) | (data[6] & 0xff); // Mode-A code (squawk)
                 aircraft->m_status = emergencyStatus[es];
-            else
+                aircraft->m_statusItem->setText(aircraft->m_status);
-                aircraft->m_status = QString("");
+                int a, b, c, d;
-            aircraft->m_statusItem->setText(aircraft->m_status);
+                c = ((modeA >> 12) & 1) | ((modeA >> (10-1)) & 0x2) | ((modeA >> (8-2)) & 0x4);
+                a = ((modeA >> 11) & 1) | ((modeA >> (9-1)) & 0x2) | ((modeA >> (7-2)) & 0x4);
+                b = ((modeA >> 5) & 1) | ((modeA >> (3-1)) & 0x2) | ((modeA << (1)) & 0x4);
+                d = ((modeA >> 4) & 1) | ((modeA >> (2-1)) & 0x2) | ((modeA << (2)) & 0x4);
+                aircraft->m_squawk = a*1000 + b*100 + c*10 + d;
+                if (modeA & 0x40)
+                    aircraft->m_squawkItem->setText(QString("%1 IDENT").arg(aircraft->m_squawk, 4, 10, QLatin1Char('0')));
+                else
+                    aircraft->m_squawkItem->setText(QString("%1").arg(aircraft->m_squawk, 4, 10, QLatin1Char('0')));
+            }
+            else if (st == 2)
+            {
+                // TCAS/ACAS RA Broadcast
+            }
         }
         else if (tc == 29)
         {
@@ -1872,6 +1889,7 @@ void ADSBDemodGUI::resizeTable()
     ui->adsbData->setItem(row, ADSB_COL_LONGITUDE, new QTableWidgetItem("-180.00000"));
     ui->adsbData->setItem(row, ADSB_COL_CATEGORY, new QTableWidgetItem("Heavy"));
     ui->adsbData->setItem(row, ADSB_COL_STATUS, new QTableWidgetItem("No emergency"));
+    ui->adsbData->setItem(row, ADSB_COL_SQUAWK, new QTableWidgetItem("Squawk"));
     ui->adsbData->setItem(row, ADSB_COL_REGISTRATION, new QTableWidgetItem("G-12345"));
     ui->adsbData->setItem(row, ADSB_COL_COUNTRY, new QTableWidgetItem("Country"));
     ui->adsbData->setItem(row, ADSB_COL_REGISTERED, new QTableWidgetItem("Registered"));
@@ -1897,6 +1915,7 @@ void ADSBDemodGUI::resizeTable()
     ui->adsbData->removeCellWidget(row, ADSB_COL_LONGITUDE);
     ui->adsbData->removeCellWidget(row, ADSB_COL_CATEGORY);
     ui->adsbData->removeCellWidget(row, ADSB_COL_STATUS);
+    ui->adsbData->removeCellWidget(row, ADSB_COL_SQUAWK);
     ui->adsbData->removeCellWidget(row, ADSB_COL_REGISTRATION);
     ui->adsbData->removeCellWidget(row, ADSB_COL_COUNTRY);
     ui->adsbData->removeCellWidget(row, ADSB_COL_REGISTERED);

plugins/channelrx/demodadsb/adsbdemodgui.h

@@ -91,6 +91,7 @@ struct Aircraft {
     int m_verticalRate;         // Vertical climb rate in ft/min
     QString m_emitterCategory;  // Aircraft type
     QString m_status;           // Aircraft status
+    int m_squawk;               // Mode-A code
     Real m_range;               // Distance from station to aircraft
     Real m_azimuth;             // Azimuth from station to aircraft
     Real m_elevation;           // Elevation from station to aicraft;
@@ -138,6 +139,7 @@ struct Aircraft {
     QTableWidgetItem *m_azElItem;
     QTableWidgetItem *m_emitterCategoryItem;
     QTableWidgetItem *m_statusItem;
+    QTableWidgetItem *m_squawkItem;
     QTableWidgetItem *m_registrationItem;
     QTableWidgetItem *m_countryItem;
     QTableWidgetItem *m_registeredItem;
@@ -193,6 +195,7 @@ struct Aircraft {
         m_longitudeItem = new QTableWidgetItem();
         m_emitterCategoryItem = new QTableWidgetItem();
         m_statusItem = new QTableWidgetItem();
+        m_squawkItem = new QTableWidgetItem();
         m_registrationItem = new QTableWidgetItem();
         m_countryItem = new QTableWidgetItem();
         m_registeredItem = new QTableWidgetItem();

plugins/channelrx/demodadsb/adsbdemodgui.ui

@@ -693,6 +693,14 @@
         <string>Aircraft emergency status</string>
        </property>
       </column>
+      <column>
+       <property name="text">
+        <string>Squawk</string>
+       </property>
+       <property name="toolTip">
+        <string>Mode-A transponder code</string>
+       </property>
+      </column>
       <column>
        <property name="text">
         <string>Reg</string>
@@ -844,6 +852,11 @@
    <extends>QWidget</extends>
    <header location="global">QtQuickWidgets/QQuickWidget</header>
   </customwidget>
+  <customwidget>
+   <class>ButtonSwitch</class>
+   <extends>QToolButton</extends>
+   <header>gui/buttonswitch.h</header>
+  </customwidget>
   <customwidget>
    <class>RollupWidget</class>
    <extends>QWidget</extends>
@@ -862,11 +875,6 @@
    <header>gui/valuedialz.h</header>
    <container>1</container>
   </customwidget>
-  <customwidget>
-   <class>ButtonSwitch</class>
-   <extends>QToolButton</extends>
-   <header>gui/buttonswitch.h</header>
-  </customwidget>
  </customwidgets>
  <tabstops>
   <tabstop>deltaFrequency</tabstop>

plugins/channelrx/demodadsb/readme.md

@@ -109,6 +109,7 @@ The table displays the decoded ADS-B data for each aircraft along side data avai
 * Longitude - Horizontal position coordinate, in decimal degrees. (ADS-B)
 * Category - The vehicle category, such as Light, Large, Heavy or Rotorcraft. (ADS-B)
 * Status - The status of the flight, including if there is an emergency. (ADS-B)
+* Squawk - The squawk code (Mode-A transponder code). (ADS-B)
 * Registration - The registration number of the aircraft. (DB)
 * Country - The flag of the country the aircraft is registered in. (DB)
 * Registered - The date when the aircraft was registered. (DB)