HackRF: implemented link Tx frequency to Rx frequency option

devices/hackrf/devicehackrfshared.h

@@ -21,6 +21,7 @@
 
 class DeviceHackRFShared
 {
+public:
     class MsgConfigureFrequencyDelta : public Message
     {
         MESSAGE_CLASS_DECLARATION

plugins/samplesink/hackrfoutput/hackrfoutputgui.cpp

@@ -28,6 +28,7 @@
 #include "device/devicesinkapi.h"
 #include "device/devicesourceapi.h"
 #include "hackrf/devicehackrfvalues.h"
+#include "hackrf/devicehackrfshared.h"
 
 #include "ui_hackrfoutputgui.h"
 
@@ -148,6 +149,13 @@ void HackRFOutputGui::handleDSPMessages()
             qDebug("HackRFOutputGui::handleDSPMessages: SampleRate:%d, CenterFrequency:%llu", notif->getSampleRate(), notif->getCenterFrequency());
             updateSampleRateAndFrequency();
 
+            delete message;
+        }
+        else if (DeviceHackRFShared::MsgConfigureFrequencyDelta::match(*message))
+        {
+            DeviceHackRFShared::MsgConfigureFrequencyDelta* deltaMsg = (DeviceHackRFShared::MsgConfigureFrequencyDelta *) message;
+            ui->centerFrequency->setValue(ui->centerFrequency->getValue() + (deltaMsg->getFrequencyDelta()/1000));
+
             delete message;
         }
     }

plugins/samplesource/hackrfinput/hackrfinput.cpp

@@ -26,6 +26,7 @@
 #include "device/devicesourceapi.h"
 #include "device/devicesinkapi.h"
 #include "hackrf/devicehackrfvalues.h"
+#include "hackrf/devicehackrfshared.h"
 
 #include "hackrfinputgui.h"
 #include "hackrfinputthread.h"
@@ -278,6 +279,16 @@ bool HackRFInput::applySettings(const HackRFInputSettings& settings, bool force)
 	qint64 f_img = deviceCenterFrequency;
 	quint32 devSampleRate =m_settings.m_devSampleRate;
 
+	if (force || (m_settings.m_centerFrequency != settings.m_centerFrequency)) // forward delta to buddy if necessary
+	{
+	    if (m_settings.m_linkTxFrequency && (m_deviceAPI->getSinkBuddies().size() > 0))
+	    {
+	        DeviceSinkAPI *buddy = m_deviceAPI->getSinkBuddies()[0];
+	        DeviceHackRFShared::MsgConfigureFrequencyDelta *deltaMsg = DeviceHackRFShared::MsgConfigureFrequencyDelta::create(settings.m_centerFrequency - m_settings.m_centerFrequency);
+	        buddy->getDeviceOutputMessageQueue()->push(deltaMsg);
+	    }
+	}
+
 	if (force || (m_settings.m_centerFrequency != settings.m_centerFrequency) ||
 			(m_settings.m_LOppmTenths != settings.m_LOppmTenths) ||
 			(m_settings.m_fcPos != settings.m_fcPos))