Simpify CW decoder

grc/CMakeLists.txt

@@ -47,9 +47,10 @@ if(${INCLUDE_DEBUG_BLOCKS})
 	list(APPEND enabled_blocks ${debug_blocks})
 endif()
 install(FILES
-	${enabled_blocks}
+    ${enabled_blocks}
     satnogs_ogg_source.xml
     satnogs_noaa_apt_sink.xml
     satnogs_frame_file_sink.xml
-    satnogs_iq_sink.xml DESTINATION share/gnuradio/grc/blocks
+    satnogs_iq_sink.xml
+    satnogs_cw_encoder.xml DESTINATION share/gnuradio/grc/blocks
 )

grc/satnogs_cw_encoder.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0"?>
+<block>
+  <name>cw_encoder</name>
+  <key>satnogs_cw_encoder</key>
+  <category>[satnogs]</category>
+  <import>import satnogs</import>
+  <make>satnogs.cw_encoder($samp_rate, $cw_freq, $wpm)</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

@@ -65,5 +65,6 @@ install(FILES
     ogg_source.h
     noaa_apt_sink.h
     frame_file_sink.h
-    iq_sink.h DESTINATION include/satnogs
+    iq_sink.h DESTINATION
+    cw_encoder.h DESTINATION include/satnogs
 )

include/satnogs/cw_encoder.h

@@ -0,0 +1,59 @@
+/* -*- c++ -*- */
+/*
+ * gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
+ *
+ *  Copyright (C) 2017
+ *  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_CW_ENCODER_H
+#define INCLUDED_SATNOGS_CW_ENCODER_H
+
+#include <satnogs/api.h>
+#include <gnuradio/sync_block.h>
+
+namespace gr
+{
+  namespace satnogs
+  {
+
+    /*!
+     * \brief CW encoder block, mainly for debugging and testing purposes.
+     * It accepts a CW word via a message source port and transmits the
+     * corresponding CW symbols.
+     * \ingroup satnogs
+     *
+     */
+    class SATNOGS_API cw_encoder : virtual public gr::sync_block
+    {
+    public:
+      typedef boost::shared_ptr<cw_encoder> sptr;
+
+      /*!
+       * \brief Return a shared_ptr to a new instance of satnogs::cw_encoder.
+       * @param samp_rate the sampling rate
+       * @param cw_freq the CW tone frequency
+       * @param wpm words per minute (WPM)
+       */
+      static sptr
+      make (double samp_rate, double cw_freq = 700, size_t wpm = 20);
+    };
+
+  } // namespace satnogs
+} // namespace gr
+
+#endif /* INCLUDED_SATNOGS_CW_ENCODER_H */
+

lib/CMakeLists.txt

@@ -63,7 +63,8 @@ list(APPEND satnogs_sources
     ogg_source_impl.cc
     noaa_apt_sink_impl.cc
     frame_file_sink_impl.cc
-    iq_sink_impl.cc)
+    iq_sink_impl.cc
+    cw_encoder_impl.cc)
 
 if(${INCLUDE_DEBUG_BLOCKS})
 	list(APPEND satnogs_sources ${satnogs_debug_sources})

lib/cw_encoder_impl.cc

@@ -0,0 +1,114 @@
+/* -*- c++ -*- */
+/*
+ * gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
+ *
+ *  Copyright (C) 2017
+ *  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 "cw_encoder_impl.h"
+
+namespace gr {
+  namespace satnogs {
+
+    const std::vector<char> cw_encoder_impl::cw_chars (
+      { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
+          'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '1', '2',
+          '3', '4', '5', '6', '7', '8', '9', '0' });
+    const std::vector<std::string> cw_encoder_impl::cw_symbols (
+          { ".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..",
+              ".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.",
+              "...", "-", "..-", "...-", ".--", "-..-", "-.--", "--..", ".----",
+              "..---", "...--", "....-", ".....", "-....", "--...", "---..",
+              "----.", "-----" });
+
+    cw_encoder::sptr
+    cw_encoder::make(double samp_rate, double cw_freq, size_t wpm)
+    {
+      return gnuradio::get_initial_sptr
+        (new cw_encoder_impl(samp_rate, cw_freq, wpm));
+    }
+
+    /*
+     * The private constructor
+     */
+    cw_encoder_impl::cw_encoder_impl(double samp_rate, double cw_freq,
+                                     size_t wpm)
+      : gr::sync_block("cw_encoder",
+              gr::io_signature::make(0, 0, 0),
+              gr::io_signature::make(1, 1, sizeof(gr_complex))),
+              d_samp_rate (samp_rate),
+              d_cw_freq (cw_freq),
+              d_wpm (wpm),
+              d_nco (),
+              d_word (new uint8_t[2048]),
+              d_remaining (0)
+    {
+      message_port_register_in(pmt::mp("word"));
+      d_nco.set_freq ((2 * M_PI * cw_freq) / samp_rate);
+    }
+
+    /*
+     * Our virtual destructor.
+     */
+    cw_encoder_impl::~cw_encoder_impl()
+    {
+      delete [] d_word;
+    }
+
+    static inline size_t
+    find_char_idx(const char* characters, size_t len, char c)
+    {
+      size_t i;
+      for(i = 0; i < len; i++) {
+        if(characters[i] == c){
+          return i;
+        }
+      }
+      return len;
+    }
+
+    std::string
+    cw_encoder_impl::get_cw_symbol (char c)
+    {
+      size_t i;
+      for(i = 0; i < cw_chars.size(); i++) {
+        if(cw_chars[i] == c) {
+          return cw_symbols[i];
+        }
+      }
+      return "";
+    }
+
+    int
+    cw_encoder_impl::work(int noutput_items,
+        gr_vector_const_void_star &input_items,
+        gr_vector_void_star &output_items)
+    {
+      gr_complex *out = (gr_complex *) output_items[0];
+
+      // Tell runtime system how many output items we produced.
+      return noutput_items;
+    }
+
+  } /* namespace satnogs */
+} /* namespace gr */
+

lib/cw_encoder_impl.h

@@ -0,0 +1,64 @@
+/* -*- c++ -*- */
+/*
+ * gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
+ *
+ *  Copyright (C) 2017
+ *  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_CW_ENCODER_IMPL_H
+#define INCLUDED_SATNOGS_CW_ENCODER_IMPL_H
+
+#include <vector>
+#include <string>
+#include <satnogs/cw_encoder.h>
+#include <gnuradio/fxpt_nco.h>
+
+namespace gr
+{
+  namespace satnogs
+  {
+
+    class cw_encoder_impl : public cw_encoder
+    {
+    private:
+      const double d_samp_rate;
+      const double d_cw_freq;
+      const size_t d_wpm;
+      gr::fxpt_nco d_nco;
+      uint8_t *d_word;
+      size_t d_remaining;
+
+      std::string
+      get_cw_symbol(char c);
+
+    public:
+      static const std::vector<char> cw_chars;
+      static const std::vector<std::string> cw_symbols;
+      cw_encoder_impl (double samp_rate, double cw_freq, size_t wpm);
+      ~cw_encoder_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_CW_ENCODER_IMPL_H */
+

swig/satnogs_swig.i

@@ -35,6 +35,7 @@
 #include "satnogs/noaa_apt_sink.h"
 #include "satnogs/frame_file_sink.h"
 #include "satnogs/iq_sink.h"
+#include "satnogs/cw_encoder.h"
 %}
 
 
@@ -108,3 +109,5 @@ GR_SWIG_BLOCK_MAGIC2(satnogs, noaa_apt_sink);
 GR_SWIG_BLOCK_MAGIC2(satnogs, frame_file_sink);
 %include "satnogs/iq_sink.h"
 GR_SWIG_BLOCK_MAGIC2(satnogs, iq_sink);
+%include "satnogs/cw_encoder.h"
+GR_SWIG_BLOCK_MAGIC2(satnogs, cw_encoder);