Start the FSK frame acquisition block of the UPSAT.

After managing to successfully receive raw bytes from the TI devboard
with the CC1120, its now time to pack them into a frame by searching for
the preamble and synchronizing with the known byte sync word.

grc/CMakeLists.txt

@@ -31,5 +31,6 @@ install(FILES
     satnogs_json_to_ecss_src.xml
     satnogs_tcp_rigctl_msg_source.xml
     satnogs_frame_encoder.xml
-    satnogs_doppler_correction_cc.xml DESTINATION share/gnuradio/grc/blocks
+    satnogs_doppler_correction_cc.xml
+    satnogs_upsat_fsk_frame_acquisition.xml DESTINATION share/gnuradio/grc/blocks
 )

grc/satnogs_upsat_fsk_frame_acquisition.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0"?>
+<block>
+  <name>upsat_fsk_frame_acquisition</name>
+  <key>satnogs_upsat_fsk_frame_acquisition</key>
+  <category>satnogs</category>
+  <import>import satnogs</import>
+  <make>satnogs.upsat_fsk_frame_acquisition($&preamble, $&sync_word, $whitening, $manchester)</make>
+  <!-- Make one 'param' node for every Parameter you want settable from the GUI.
+       Sub-nodes:
+       * name
+       * key (makes the value accessible as $keyname, e.g. in the make node)
+       * type -->
+  <param>
+    <name>...</name>
+    <key>...</key>
+    <type>...</type>
+  </param>
+
+  <!-- Make one 'sink' node per input. Sub-nodes:
+       * name (an identifier for the GUI)
+       * type
+       * vlen
+       * optional (set to 1 for optional inputs) -->
+  <sink>
+    <name>in</name>
+    <type><!-- e.g. int, float, complex, byte, short, xxx_vector, ...--></type>
+  </sink>
+
+  <!-- Make one 'source' node per output. Sub-nodes:
+       * name (an identifier for the GUI)
+       * type
+       * vlen
+       * optional (set to 1 for optional inputs) -->
+  <source>
+    <name>out</name>
+    <type><!-- e.g. int, float, complex, byte, short, xxx_vector, ...--></type>
+  </source>
+</block>

include/satnogs/CMakeLists.txt

@@ -44,5 +44,6 @@ install(FILES
     frame_encoder.h
     doppler_correction_cc.h
     doppler_fit.h
-    freq_drift.h DESTINATION include/satnogs
+    freq_drift.h
+    upsat_fsk_frame_acquisition.h DESTINATION include/satnogs
 )

include/satnogs/upsat_fsk_frame_acquisition.h

@@ -0,0 +1,66 @@
+/* -*- c++ -*- */
+/*
+ * gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
+ *
+ *  Copyright (C) 2016, Libre Space Foundation <http://librespacefoundation.org/>
+ *
+ *  This program 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.
+ *
+ *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef INCLUDED_SATNOGS_UPSAT_FSK_FRAME_ACQUISITION_H
+#define INCLUDED_SATNOGS_UPSAT_FSK_FRAME_ACQUISITION_H
+
+#include <satnogs/api.h>
+#include <gnuradio/sync_block.h>
+
+namespace gr
+{
+  namespace satnogs
+  {
+
+    /*!
+     * \brief This block takes samples after the Clock Recovery block
+     * and tries to extract frames. This is performed by searching for a
+     * known preamble. For the byte synchronization the block tries to
+     * search for the specified synchronization word that should be present
+     * before the start of the payload.
+     *
+     * \ingroup satnogs
+     *
+     */
+    class SATNOGS_API upsat_fsk_frame_acquisition : virtual public gr::sync_block
+    {
+    public:
+      typedef boost::shared_ptr<upsat_fsk_frame_acquisition> sptr;
+
+      /*!
+       * Creates the FSK frame acquisition block for the UPSAT satellite.
+       * @param preamble the bytes that consist the preamble of the frame
+       * @param sync_word the byte synchronization word
+       * @param whitening true if the transmitted data have been processed by
+       * the whitening algorithm of the CC1120 chip. False otherwise.
+       * @param manchester true if the transmitted data have been processed by
+       * the Manchester algorithm of the CC1120 chip. False otherwise.
+       */
+      static sptr
+      make (const std::vector<uint8_t> &preamble,
+	    const std::vector<uint8_t> &sync_word, bool whitening = false,
+	    bool manchester = false);
+    };
+
+  } // namespace satnogs
+} // namespace gr
+
+#endif /* INCLUDED_SATNOGS_UPSAT_FSK_FRAME_ACQUISITION_H */
+

lib/CMakeLists.txt

@@ -42,7 +42,8 @@ list(APPEND satnogs_sources
     doppler_correction_cc_impl.cc
     frame_encoder_impl.cc
     doppler_fit.cc
-    freq_drift.cc )
+    freq_drift.cc
+    upsat_fsk_frame_acquisition_impl.cc )
 
 set(satnogs_sources "${satnogs_sources}" PARENT_SCOPE)
 if(NOT satnogs_sources)

lib/upsat_fsk_frame_acquisition_impl.cc

@@ -0,0 +1,77 @@
+/* -*- c++ -*- */
+/*
+ * gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
+ *
+ *  Copyright (C) 2016, Libre Space Foundation <http://librespacefoundation.org/>
+ *
+ *  This program 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.
+ *
+ *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include "upsat_fsk_frame_acquisition_impl.h"
+
+namespace gr
+{
+  namespace satnogs
+  {
+
+    upsat_fsk_frame_acquisition::sptr
+    upsat_fsk_frame_acquisition::make (const std::vector<uint8_t> &preamble,
+				       const std::vector<uint8_t> &sync_word,
+				       bool whitening, bool manchester)
+    {
+      return gnuradio::get_initial_sptr (
+	  new upsat_fsk_frame_acquisition_impl (preamble, sync_word, whitening,
+						manchester));
+    }
+
+    /*
+     * The private constructor
+     */
+    upsat_fsk_frame_acquisition_impl::upsat_fsk_frame_acquisition_impl (
+	const std::vector<uint8_t> &preamble,
+	const std::vector<uint8_t> &sync_word, bool whitening, bool manchester) :
+	    gr::sync_block ("upsat_fsk_frame_acquisition",
+			    gr::io_signature::make (1, 1, sizeof(float)),
+			    gr::io_signature::make (0, 0, 0))
+    {
+    }
+
+    /*
+     * Our virtual destructor.
+     */
+    upsat_fsk_frame_acquisition_impl::~upsat_fsk_frame_acquisition_impl ()
+    {
+    }
+
+    int
+    upsat_fsk_frame_acquisition_impl::work (
+	int noutput_items, gr_vector_const_void_star &input_items,
+	gr_vector_void_star &output_items)
+    {
+      const float *in = (const float *) input_items[0];
+
+      // Do <+signal processing+>
+
+      // Tell runtime system how many output items we produced.
+      return noutput_items;
+    }
+
+  } /* namespace satnogs */
+} /* namespace gr */
+

lib/upsat_fsk_frame_acquisition_impl.h

@@ -0,0 +1,52 @@
+/* -*- c++ -*- */
+/*
+ * gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
+ *
+ *  Copyright (C) 2016, Libre Space Foundation <http://librespacefoundation.org/>
+ *
+ *  This program 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.
+ *
+ *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef INCLUDED_SATNOGS_UPSAT_FSK_FRAME_ACQUISITION_IMPL_H
+#define INCLUDED_SATNOGS_UPSAT_FSK_FRAME_ACQUISITION_IMPL_H
+
+#include <satnogs/upsat_fsk_frame_acquisition.h>
+
+namespace gr
+{
+  namespace satnogs
+  {
+
+    class upsat_fsk_frame_acquisition_impl : public upsat_fsk_frame_acquisition
+    {
+    private:
+      // Nothing to declare in this block.
+
+    public:
+      upsat_fsk_frame_acquisition_impl (const std::vector<uint8_t> &preamble,
+					const std::vector<uint8_t> &sync_word,
+					bool whitening, bool manchester);
+      ~upsat_fsk_frame_acquisition_impl ();
+
+      // Where all the action really happens
+      int
+      work (int noutput_items, gr_vector_const_void_star &input_items,
+	    gr_vector_void_star &output_items);
+    };
+
+  } // namespace satnogs
+} // namespace gr
+
+#endif /* INCLUDED_SATNOGS_UPSAT_FSK_FRAME_ACQUISITION_IMPL_H */
+

swig/satnogs_swig.i

@@ -25,6 +25,7 @@
 #include "satnogs/json_to_ecss_src.h"
 #include "satnogs/doppler_correction_cc.h"
 #include "satnogs/frame_encoder.h"
+#include "satnogs/upsat_fsk_frame_acquisition.h"
 %}
 
 
@@ -59,3 +60,5 @@ GR_SWIG_BLOCK_MAGIC2(satnogs, json_to_ecss_src);
 GR_SWIG_BLOCK_MAGIC2(satnogs, frame_encoder);
 %include "satnogs/doppler_correction_cc.h"
 GR_SWIG_BLOCK_MAGIC2(satnogs, doppler_correction_cc);
+%include "satnogs/upsat_fsk_frame_acquisition.h"
+GR_SWIG_BLOCK_MAGIC2(satnogs, upsat_fsk_frame_acquisition);