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

drivers/gr-gn3s/include/gn3s_source_cc.h

@@ -0,0 +1,96 @@
+/*!
+ * \file gn3s_source_cc.h
+ * \brief GNU Radio source block to acces to SiGe GN3S USB sampler v2.
+ * \author Javier Arribas, 2012. 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 INCLUDED_GN3S_SOURCE_CC_H
+#define INCLUDED_GN3S_SOURCE_CC_H
+
+#include "gn3s_api.h"
+#include <gr_block.h>
+#include "gn3s_source.h"
+#include "gn3s_defines.h"
+
+class gn3s_source_cc;
+
+/*
+ * We use boost::shared_ptr's instead of raw pointers for all access
+ * to gr_blocks (and many other data structures).  The shared_ptr gets
+ * us transparent reference counting, which greatly simplifies storage
+ * management issues.  This is especially helpful in our hybrid
+ * C++ / Python system.
+ *
+ * See http://www.boost.org/libs/smart_ptr/smart_ptr.htm
+ *
+ * As a convention, the _sptr suffix indicates a boost::shared_ptr
+ */
+typedef boost::shared_ptr<gn3s_source_cc> gn3s_source_cc_sptr;
+
+/*!
+ * \brief Return a shared_ptr to a new instance of howto_square_ff.
+ *
+ * To avoid accidental use of raw pointers, gn3s_source's
+ * constructor is private.  gn3s_source is the public
+ * interface for creating new instances.
+ */
+GN3S_API gn3s_source_cc_sptr gn3s_make_source_cc ();
+
+/*!
+ * \brief SiGe GN3S V2 sampler USB driver.
+ * \ingroup block
+ *
+ * \sa gn3s_source for a version that subclasses gr_block.
+ */
+class GN3S_API gn3s_source_cc : public gr_block
+{
+private:
+  // The friend declaration allows gn3s_source to
+  // access the private constructor.
+
+  /* Create the GN3S object*/
+  gn3s_Source *gn3s_drv;
+  gn3s_ms_packet packet;
+
+  friend GN3S_API gn3s_source_cc_sptr gn3s_make_source_cc ();
+
+  /*!
+   * \brief
+   */
+  gn3s_source_cc ();  	// private constructor
+
+ public:
+  ~gn3s_source_cc ();	// public destructor
+
+  // Where all the action really happens
+
+  int general_work (int noutput_items,
+		    gr_vector_int &ninput_items,
+		    gr_vector_const_void_star &input_items,
+		    gr_vector_void_star &output_items);
+};
+
+#endif /* INCLUDED_GN3S_SOURCE_CC_H */