Added optional support for Sparkfun SiGe GN3S USB GPS RF sampler:

- Added a pre-compiled custom GN3S firmware.
- Added a fully-compliant GNU Radio source block for GN3S USB dongle. It can be used also from GNU Radio companion and from Python applications.
- Added a new GN3S_Signal_Source block. It is possible to disable the GN3S signal source compilation. See README.

git-svn-id: https://svn.code.sf.net/p/gnss-sdr/code/trunk@217 64b25241-fba3-4117-9849-534c7e92360d

src/algorithms/signal_source/adapters/gn3s_signal_source.cc

@@ -0,0 +1,125 @@
+/*!
+ * \file gn3s_signal_source.cc
+ * \brief GN3S USB dongle GPS RF front-end signal sampler driver
+ * \author Javier Arribas, jarribas(at)cttc.es
+ *
+ * -------------------------------------------------------------------------
+ *
+ * Copyright (C) 2010-2012  (see AUTHORS file for a list of contributors)
+ *
+ * GNSS-SDR is a software defined Global Navigation
+ *          Satellite Systems receiver
+ *
+ * This file is part of GNSS-SDR.
+ *
+ * GNSS-SDR is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * at your option) any later version.
+ *
+ * GNSS-SDR is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * -------------------------------------------------------------------------
+ */
+
+#include "gn3s_signal_source.h"
+#include <gnuradio/gr_file_sink.h>
+#include <gnuradio/gr_msg_queue.h>
+#include <gn3s/gn3s_source_cc.h>
+#include "configuration_interface.h"
+#include <glog/log_severity.h>
+#include <glog/logging.h>
+
+using google::LogMessage;
+
+Gn3sSignalSource::Gn3sSignalSource(ConfigurationInterface* configuration,
+		std::string role, unsigned int in_stream, unsigned int out_stream, gr_msg_queue_sptr queue) :
+        role_(role), in_stream_(in_stream), out_stream_(out_stream), queue_(queue)
+{
+
+    std::string default_item_type = "short";
+    std::string default_dump_file = "./data/gn3s_source.dat";
+
+    item_type_ = configuration->property(role + ".item_type",
+            default_item_type);
+    dump_ = configuration->property(role + ".dump", false);
+    dump_filename_ = configuration->property(role + ".dump_filename",
+            default_dump_file);
+
+    if (item_type_.compare("gr_complex") == 0)
+        {
+            item_size_ = sizeof(gr_complex);
+            gn3s_source_ = gn3s_make_source_cc();
+            DLOG(INFO) << "Item size " << item_size_;
+            DLOG(INFO) << "gn3s_source(" << gn3s_source_->unique_id() << ")";
+
+        }
+//    else if (item_type_.compare("short") == 0)
+//        {
+//            item_size_ = sizeof(short);
+//            resampler_ = direct_resampler_make_conditioner_ss(sample_freq_in_,
+//                    sample_freq_out_);
+//        }
+    else
+        {
+            LOG_AT_LEVEL(WARNING) << item_type_
+                    << " unrecognized item type for resampler";
+            item_size_ = sizeof(short);
+        }
+
+    if (dump_)
+        {
+            DLOG(INFO) << "Dumping output into file " << dump_filename_;
+            file_sink_ = gr_make_file_sink(item_size_, dump_filename_.c_str());
+        }
+
+
+    if (dump_)
+        {
+            DLOG(INFO) << "file_sink(" << file_sink_->unique_id() << ")";
+        }
+}
+
+Gn3sSignalSource::~Gn3sSignalSource()
+{
+}
+void Gn3sSignalSource::connect(gr_top_block_sptr top_block)
+{
+
+    if (dump_)
+        {
+            top_block->connect(gn3s_source_, 0, file_sink_, 0);
+            DLOG(INFO) << "connected gn3s_source to file sink";
+        }
+    else
+        {
+            DLOG(INFO) << "nothing to connect internally";
+        }
+
+}
+
+void Gn3sSignalSource::disconnect(gr_top_block_sptr top_block)
+{
+    if (dump_)
+        {
+            top_block->disconnect(gn3s_source_, 0, file_sink_, 0);
+        }
+}
+
+gr_basic_block_sptr Gn3sSignalSource::get_left_block()
+{
+    LOG_AT_LEVEL(WARNING)
+                    << "Left block of a signal source should not be retrieved";
+    return gr_block_sptr();
+}
+
+gr_basic_block_sptr Gn3sSignalSource::get_right_block()
+{
+    return gn3s_source_;
+}

src/algorithms/signal_source/adapters/gn3s_signal_source.h

@@ -0,0 +1,84 @@
+/*!
+ * \file gn3s_signal_source.h
+ * \brief GN3S USB dongle GPS RF front-end signal sampler driver
+ * \author Javier Arribas, jarribas(at)cttc.es
+ *
+ * -------------------------------------------------------------------------
+ *
+ * Copyright (C) 2010-2012  (see AUTHORS file for a list of contributors)
+ *
+ * GNSS-SDR is a software defined Global Navigation
+ *          Satellite Systems receiver
+ *
+ * This file is part of GNSS-SDR.
+ *
+ * GNSS-SDR is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * at your option) any later version.
+ *
+ * GNSS-SDR is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNSS-SDR. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * -------------------------------------------------------------------------
+ */
+
+
+#ifndef GN3S_SIGNAL_SOURCE_H_
+#define GN3S_SIGNAL_SOURCE_H_
+
+#include <gnuradio/gr_hier_block2.h>
+#include "gnss_block_interface.h"
+#include <gnuradio/gr_msg_queue.h>
+
+class ConfigurationInterface;
+
+class Gn3sSignalSource: public GNSSBlockInterface
+{
+
+public:
+	Gn3sSignalSource(ConfigurationInterface* configuration,
+            std::string role, unsigned int in_stream,
+            unsigned int out_stream, gr_msg_queue_sptr queue);
+
+    virtual ~Gn3sSignalSource();
+
+    std::string role()
+    {
+        return role_;
+    }
+    std::string implementation()
+    {
+        return "Gn3sSignalSource";
+    }
+    size_t item_size()
+    {
+        return item_size_;
+    }
+
+    void connect(gr_top_block_sptr top_block);
+    void disconnect(gr_top_block_sptr top_block);
+    gr_basic_block_sptr get_left_block();
+    gr_basic_block_sptr get_right_block();
+
+private:
+
+    std::string role_;
+    unsigned int in_stream_;
+    unsigned int out_stream_;
+    std::string item_type_;
+    size_t item_size_;
+    long samples_;
+    bool dump_;
+    std::string dump_filename_;
+    gr_block_sptr gn3s_source_;
+    gr_block_sptr file_sink_;
+    gr_msg_queue_sptr queue_;
+};
+
+#endif /*GN3S_SIGNAL_SOURCE_H_*/

src/algorithms/signal_source/adapters/jamfile.jam

@@ -1,6 +1,13 @@
 project : build-dir ../../../../build ;
 
+#ECHO Global: [ VARNAMES ] ;
+local GN3S_DRIVER = [ modules.peek : GN3S_DRIVER ] ; 
+
 obj file_signal_source : file_signal_source.cc ;
 obj uhd_signal_source : uhd_signal_source.cc ;
 
+if ($(GN3S_DRIVER))
+{
+	obj gn3s_signal_source : gn3s_signal_source.cc ;
+}