PlutoSDR input: display actual gain value returned from device

devices/plutosdr/deviceplutosdrbox.cpp

@@ -626,6 +626,37 @@ void DevicePlutoSDRBox::getXO()
     }
 }
 
+bool DevicePlutoSDRBox::getRxGain(int& gaindB, unsigned int chan)
+{
+    chan = chan % 2;
+    char buff[30];
+    snprintf(buff, sizeof(buff), "in_voltage%d_hardwaregain", chan);
+    std::string gainStr;
+    get_param(DEVICE_PHY, buff, gainStr);
+
+    std::regex gain_regex("(.+)\\.(.+) dB");
+    std::smatch gain_match;
+    std::regex_search(gainStr, gain_match, gain_regex);
+
+    if (gain_match.size() == 3)
+    {
+        try
+        {
+            gaindB = boost::lexical_cast<int>(gain_match[1]);
+            return true;
+        }
+        catch (const boost::bad_lexical_cast &e)
+        {
+            qWarning("DevicePlutoSDRBox::getRxGain: bad conversion to numeric");
+            return false;
+        }
+    }
+    else
+    {
+        return false;
+    }
+}
+
 bool DevicePlutoSDRBox::getRxRSSI(std::string& rssiStr, unsigned int chan)
 {
     chan = chan % 2;

devices/plutosdr/deviceplutosdrbox.h

@@ -93,6 +93,7 @@ public:
     void setFIR(uint32_t sampleRate, uint32_t intdec, DeviceUse use, uint32_t bw, int gain);
     void setFIREnable(bool enable);
     void setLOPPMTenths(int ppmTenths);
+    bool getRxGain(int& gaindB, unsigned int chan);
     bool getRxRSSI(std::string& rssiStr, unsigned int chan);
     bool getTxRSSI(std::string& rssiStr, unsigned int chan);
     bool fetchTemp();

plugins/samplesource/plutosdrinput/plutosdrinput.cpp

@@ -538,6 +538,15 @@ void PlutoSDRInput::getRSSI(std::string& rssiStr)
     }
 }
 
+void PlutoSDRInput::getGain(int& gaindB)
+{
+    DevicePlutoSDRBox *plutoBox =  m_deviceShared.m_deviceParams->getBox();
+
+    if (!plutoBox->getRxGain(gaindB, 0)) {
+        gaindB = 0;
+    }
+}
+
 bool PlutoSDRInput::fetchTemperature()
 {
     DevicePlutoSDRBox *plutoBox =  m_deviceShared.m_deviceParams->getBox();

plugins/samplesource/plutosdrinput/plutosdrinput.h

@@ -90,6 +90,7 @@ public:
     uint32_t getADCSampleRate() const { return m_deviceSampleRates.m_addaConnvRate; }
     uint32_t getFIRSampleRate() const { return m_deviceSampleRates.m_hb1Rate; }
     void getRSSI(std::string& rssiStr);
+    void getGain(int& gainStr);
     bool fetchTemperature();
     float getTemperature();
 

plugins/samplesource/plutosdrinput/plutosdrinputgui.cpp

@@ -386,6 +386,9 @@ void PlutoSDRInputGui::updateStatus()
         std::string rssiStr;
         ((PlutoSDRInput *) m_sampleSource)->getRSSI(rssiStr);
         ui->rssiText->setText(tr("-%1").arg(QString::fromStdString(rssiStr)));
+        int gaindB;
+        ((PlutoSDRInput *) m_sampleSource)->getGain(gaindB);
+        ui->actualGainText->setText(tr("%1").arg(gaindB));
     }
 
     if (m_statusCounter % 10 == 0) // 5s

plugins/samplesource/plutosdrinput/plutosdrinputgui.ui

@@ -848,6 +848,25 @@
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QLabel" name="actualGainText">
+       <property name="minimumSize">
+        <size>
+         <width>24</width>
+         <height>0</height>
+        </size>
+       </property>
+       <property name="toolTip">
+        <string>Actual gain (dB)</string>
+       </property>
+       <property name="text">
+        <string>00</string>
+       </property>
+       <property name="alignment">
+        <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+       </property>
+      </widget>
+     </item>
      <item>
       <widget class="Line" name="line_3">
        <property name="orientation">

plugins/samplesource/plutosdrinput/plutosdrinputplugin.cpp

@@ -28,7 +28,7 @@ class DeviceSourceAPI;
 
 const PluginDescriptor PlutoSDRInputPlugin::m_pluginDescriptor = {
 	QString("PlutoSDR Input"),
-	QString("3.7.3"),
+	QString("3.7.4"),
 	QString("(c) Edouard Griffiths, F4EXB"),
 	QString("https://github.com/f4exb/sdrangel"),
 	true,