Merge pull request #83 from cjcliffe/direct_sampling

Adds RTL-SDR direct sampling mode option

src/AppFrame.cpp

@@ -129,15 +129,29 @@ AppFrame::AppFrame() :
     // Make a menubar
     wxMenuBar *menuBar = new wxMenuBar;
     wxMenu *menu = new wxMenu;
-//    menu->Append(wxID_NEW);
+
     menu->Append(wxID_SET_FREQ_OFFSET, "Set Frequency Offset");
     menu->Append(wxID_SET_PPM, "Set Device PPM");
+    
+    wxMenu *dsMenu = new wxMenu;
+            
+    dsMenu->AppendRadioItem(wxID_SET_DS_OFF, "Off");
+    dsMenu->AppendRadioItem(wxID_SET_DS_I, "I-ADC");
+    dsMenu->AppendRadioItem(wxID_SET_DS_Q, "Q-ADC");
+
+    menu->AppendSubMenu(dsMenu, "Direct Sampling");
+    
+    wxMenu *sessionMenu = new wxMenu;
+    sessionMenu->Append(wxID_OPEN, "&Open Session");
+    sessionMenu->Append(wxID_SAVE, "&Save Session");
+    sessionMenu->Append(wxID_SAVEAS, "Save Session &As..");
+    sessionMenu->AppendSeparator();
+    sessionMenu->Append(wxID_RESET, "&Reset Session");
+
+    menu->AppendSubMenu(sessionMenu, "Session");
+            
     menu->AppendSeparator();
-    menu->Append(wxID_OPEN, "&Open Session");
+            
-    menu->Append(wxID_SAVE, "&Save Session");
-    menu->Append(wxID_SAVEAS, "Save Session &As..");
-    menu->AppendSeparator();
-    menu->Append(wxID_RESET, "&Reset Session");
     menu->Append(wxID_CLOSE);
 
     menuBar->Append(menu, wxT("&File"));
@@ -320,6 +334,12 @@ void AppFrame::OnMenu(wxCommandEvent& event) {
         if (ofs != -1) {
             wxGetApp().setOffset(ofs);
         }
+    } else if (event.GetId() == wxID_SET_DS_OFF) {
+        wxGetApp().setDirectSampling(0);
+    } else if (event.GetId() == wxID_SET_DS_I) {
+        wxGetApp().setDirectSampling(1);
+    } else if (event.GetId() == wxID_SET_DS_Q) {
+        wxGetApp().setDirectSampling(2);
     } else if (event.GetId() == wxID_SET_PPM) {
         long ofs = wxGetNumberFromUser("Frequency correction for device in PPM.\ni.e. -51 for -51 PPM\n\nNote: you can adjust PPM interactively\nby holding ALT over the frequency tuning bar.\n", "Parts per million (PPM)",
                 "Frequency Correction", wxGetApp().getPPM(), -1000, 1000, this);

src/AppFrame.h

@@ -16,6 +16,9 @@
 #define wxID_SET_FREQ_OFFSET 2001
 #define wxID_RESET 2002
 #define wxID_SET_PPM 2003
+#define wxID_SET_DS_OFF 2004
+#define wxID_SET_DS_I 2005
+#define wxID_SET_DS_Q 2006
 
 #define wxID_THEME_DEFAULT 2100
 #define wxID_THEME_SHARP 2101

src/CubicSDR.cpp

@@ -45,6 +45,7 @@ bool CubicSDR::OnInit() {
     frequency = DEFAULT_FREQ;
     offset = 0;
     ppm = 0;
+    directSamplingMode = 0;
 
     audioVisualQueue = new DemodulatorThreadOutputQueue();
     audioVisualQueue->set_max_num_items(1);
@@ -170,6 +171,17 @@ void CubicSDR::setOffset(long long ofs) {
     threadCmdQueueSDR->push(command);
 }
 
+void CubicSDR::setDirectSampling(int mode) {
+    directSamplingMode = mode;
+    SDRThreadCommand command(SDRThreadCommand::SDR_THREAD_CMD_SET_DIRECT_SAMPLING);
+    command.llong_value = mode;
+    threadCmdQueueSDR->push(command);
+}
+
+int CubicSDR::getDirectSampling() {
+    return directSamplingMode;
+}
+
 long long CubicSDR::getFrequency() {
     return frequency;
 }

src/CubicSDR.h

@@ -37,6 +37,9 @@ public:
     void setOffset(long long ofs);
     long long getOffset();
 
+    void setDirectSampling(int mode);
+    int getDirectSampling();
+
     void setSampleRate(long long rate_in);
     long long getSampleRate();
 
@@ -74,6 +77,7 @@ private:
     long long offset;
     int ppm, snap;
     long long sampleRate;
+    int directSamplingMode;
 
     SDRThread *sdrThread;
     SDRPostThread *sdrPostThread;

src/sdr/SDRThread.cpp

@@ -140,6 +140,7 @@ void SDRThread::threadMain() {
 
     long long frequency = DEFAULT_FREQ;
     int ppm = wxGetApp().getConfig()->getDevice(devs[deviceId]->getDeviceId())->getPPM();
+    int direct_sampling_mode = 0;
 
     rtlsdr_open(&dev, deviceId);
     rtlsdr_set_sample_rate(dev, sampleRate);
@@ -170,6 +171,7 @@ void SDRThread::threadMain() {
             bool rate_changed = false;
             bool device_changed = false;
             bool ppm_changed = false;
+            bool direct_sampling_changed = false;
             long long new_freq = frequency;
             long long new_offset = offset;
             long long new_rate = sampleRate;
@@ -209,6 +211,10 @@ void SDRThread::threadMain() {
                     new_ppm = (int) command.llong_value;
                     //std::cout << "Set PPM: " << new_ppm << std::endl;
                     break;
+                case SDRThreadCommand::SDR_THREAD_CMD_SET_DIRECT_SAMPLING:
+                    direct_sampling_mode = (int)command.llong_value;
+                    direct_sampling_changed = true;
+                    break;
                 default:
                     break;
                 }
@@ -222,6 +228,7 @@ void SDRThread::threadMain() {
                 rtlsdr_set_freq_correction(dev, ppm);
                 rtlsdr_set_agc_mode(dev, 1);
                 rtlsdr_set_offset_tuning(dev, 0);
+                rtlsdr_set_direct_sampling(dev, direct_sampling_mode);
                 rtlsdr_reset_buffer(dev);
             }
             if (offset_changed && !freq_changed) {
@@ -241,6 +248,9 @@ void SDRThread::threadMain() {
                 ppm = new_ppm;
                 rtlsdr_set_freq_correction(dev, ppm);
             }
+            if (direct_sampling_changed) {
+                rtlsdr_set_direct_sampling(dev, direct_sampling_mode);
+            }
         }
 
         rtlsdr_read_sync(dev, buf, BUF_SIZE, &n_read);

src/sdr/SDRThread.h

@@ -81,7 +81,7 @@ private:
 class SDRThreadCommand {
 public:
     enum SDRThreadCommandEnum {
-        SDR_THREAD_CMD_NULL, SDR_THREAD_CMD_TUNE, SDR_THREAD_CMD_SET_OFFSET, SDR_THREAD_CMD_SET_SAMPLERATE, SDR_THREAD_CMD_SET_PPM, SDR_THREAD_CMD_SET_DEVICE
+        SDR_THREAD_CMD_NULL, SDR_THREAD_CMD_TUNE, SDR_THREAD_CMD_SET_OFFSET, SDR_THREAD_CMD_SET_SAMPLERATE, SDR_THREAD_CMD_SET_PPM, SDR_THREAD_CMD_SET_DEVICE, SDR_THREAD_CMD_SET_DIRECT_SAMPLING
     };
 
     SDRThreadCommand() :