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gr-satnogs
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Introduce 8b10b Decoder

This commit is contained in:
Nikos Karamolegkos 2018-01-25 17:13:08 +02:00 committed by Manolis Surligas
parent 0b7fed15e8
commit c2d20fbead
8 changed files with 293 additions and 3 deletions
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3
grc/CMakeLists.txt
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@ -52,5 +52,6 @@ if(${INCLUDE_DEBUG_BLOCKS})
endif()
install(FILES
${enabled_blocks}
satnogs_quad_demod_filter_ff.xml DESTINATION share/gnuradio/grc/blocks
satnogs_quad_demod_filter_ff.xml
satnogs_decoder_8b10b.xml DESTINATION share/gnuradio/grc/blocks
)

48
grc/satnogs_decoder_8b10b.xml Normal file
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@ -0,0 +1,48 @@
<?xml version="1.0"?>
<block>
<name>8b10b Decoder</name>
<key>satnogs_decoder_8b10b</key>
<category>[SatNOGS]</category>
<import>import satnogs</import>
<make>satnogs.decoder_8b10b($control_symbol, $max_frame_len,
$comp_type)</make>
<param>
<name>Control symbols</name>
<key>control_symbol</key>
<value>0011111010</value>
<type>string</type>
</param>
<param>
<name>Maximum frame length</name>
<key>max_frame_len</key>
<value>1500</value>
<type>int</type>
</param>
<param>
<name>Comparison type</name>
<key>comp_type</key>
<type>enum</type>
<option>
<name>Equality</name>
<key>0</key>
</option>
<option>
<name>Hamming</name>
<key>1</key>
</option>
</param>
<sink>
<name>in</name>
<type>byte</type>
</sink>
<source>
<name>pdu</name>
<type>message</type>
</source>
</block>

3
include/satnogs/CMakeLists.txt
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@ -67,5 +67,6 @@ endif()
install(FILES
${HEADER_FILES}
quad_demod_filter_ff.h DESTINATION include/satnogs
quad_demod_filter_ff.h
decoder_8b10b.h DESTINATION include/satnogs
)

58
include/satnogs/decoder_8b10b.h Normal file
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@ -0,0 +1,58 @@
/* -*- c++ -*- */
/*
* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
*
* Copyright (C) 2018, 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_DECODER_8B10B_H
#define INCLUDED_SATNOGS_DECODER_8B10B_H
#include <satnogs/api.h>
#include <gnuradio/sync_block.h>
namespace gr
{
namespace satnogs
{
/*!
* \brief <+description of block+>
* \ingroup satnogs
*
*/
class SATNOGS_API decoder_8b10b : virtual public gr::sync_block
{
public:
typedef boost::shared_ptr<decoder_8b10b> sptr;
/*!
* \brief Return a shared_ptr to a new instance of satnogs::decoder_8b10b.
*
* To avoid accidental use of raw pointers, satnogs::decoder_8b10b's
* constructor is in a private implementation
* class. satnogs::decoder_8b10b::make is the public interface for
* creating new instances.
*/
static sptr make(const std::string& control_symbol,size_t max_frame_len,int comp_type);
};
}
// namespace satnogs
}// namespace gr
#endif /* INCLUDED_SATNOGS_DECODER_8B10B_H */

3
lib/CMakeLists.txt
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@ -65,7 +65,8 @@ list(APPEND satnogs_sources
noaa_apt_sink_impl.cc
frame_file_sink_impl.cc
iq_sink_impl.cc
quad_demod_filter_ff_impl.cc)
quad_demod_filter_ff_impl.cc
decoder_8b10b_impl.cc)
if(${INCLUDE_DEBUG_BLOCKS})
list(APPEND satnogs_sources ${satnogs_debug_sources})

119
lib/decoder_8b10b_impl.cc Normal file
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@ -0,0 +1,119 @@
/* -*- c++ -*- */
/*
* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
*
* Copyright (C) 2018, 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 "decoder_8b10b_impl.h"
#include <gnuradio/blocks/count_bits.h>
namespace gr
{
namespace satnogs
{
decoder_8b10b::sptr
decoder_8b10b::make (const std::string& control_symbol,
size_t max_frame_len, int comp_type)
{
return gnuradio::get_initial_sptr (
new decoder_8b10b_impl (control_symbol, max_frame_len, comp_type));
}
/*
* The private constructor
*/
decoder_8b10b_impl::decoder_8b10b_impl (const std::string& control_symbol,
size_t max_frame_len, int comp_type) :
gr::sync_block ("decoder_8b10b",
gr::io_signature::make (1, 1, sizeof(char)),
gr::io_signature::make (0, 0, 0)),
d_max_frame_len (max_frame_len),
d_comp_type (comp_type),
d_control_symbol_pos (0),
d_control_symbol_neg (0),
d_data_reg (0)
{
message_port_register_out (pmt::mp ("pdu"));
if (!set_access_code (control_symbol)) {
GR_LOG_ERROR(d_logger, "control_symbol is not 10 bits");
throw std::out_of_range ("control_symbol is not 10 bits");
}
}
/*
* Our virtual destructor.
*/
decoder_8b10b_impl::~decoder_8b10b_impl ()
{
}
bool
decoder_8b10b_impl::set_access_code (const std::string &control_symbol)
{
unsigned len = control_symbol.length (); // # of bytes in string
/* if the control sequence is not 10-bit then throw exception */
if (len != 10) {
return false;
}
for (size_t i = 0; i < len; i++) {
d_control_symbol_pos = (d_control_symbol_pos << 1)
| (control_symbol[i] & 0x1);
}
d_control_symbol_neg = ~d_control_symbol_pos;
return true;
}
int
decoder_8b10b_impl::work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const uint8_t *in = (const uint8_t *) input_items[0];
for (int i = 0; i < noutput_items; i++) {
d_data_reg = (d_data_reg << 1) | (in[i] & 0x1);
unsigned long long wrong_bits = (d_data_reg ^ d_control_symbol_pos)
& 0x3FF;
unsigned int nwrong = gr::blocks::count_bits64 (wrong_bits);
if (nwrong <= 1) {
d_data_reg = 0;
printf ("Packet found \n");
}
//GR_LOG_DEBUG(d_logger, boost::format ("Wrong number: %u") % wrong_bits);
}
// Tell runtime system how many output items we produced.
return noutput_items;
}
}
/* namespace satnogs */
} /* namespace gr */

59
lib/decoder_8b10b_impl.h Normal file
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@ -0,0 +1,59 @@
/* -*- c++ -*- */
/*
* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
*
* Copyright (C) 2018, 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_DECODER_8B10B_IMPL_H
#define INCLUDED_SATNOGS_DECODER_8B10B_IMPL_H
#include <satnogs/decoder_8b10b.h>
namespace gr
{
namespace satnogs
{
class decoder_8b10b_impl : public decoder_8b10b
{
private:
size_t d_max_frame_len;
int d_comp_type;
uint16_t d_control_symbol_pos;
uint16_t d_control_symbol_neg;
uint16_t d_data_reg;
public:
decoder_8b10b_impl (const std::string& control_symbol,
size_t max_frame_len, int comp_type);
~decoder_8b10b_impl ();
bool
set_access_code (const std::string &access_code);
// 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_DECODER_8B10B_IMPL_H */

3
swig/satnogs_swig0.i
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@ -32,6 +32,7 @@
#include "satnogs/frame_file_sink.h"
#include "satnogs/iq_sink.h"
#include "satnogs/quad_demod_filter_ff.h"
#include "satnogs/decoder_8b10b.h"
%}
@ -100,3 +101,5 @@ GR_SWIG_BLOCK_MAGIC2(satnogs, frame_file_sink);
GR_SWIG_BLOCK_MAGIC2(satnogs, iq_sink);
%include "satnogs/quad_demod_filter_ff.h"
GR_SWIG_BLOCK_MAGIC2(satnogs, quad_demod_filter_ff);
%include "satnogs/decoder_8b10b.h"
GR_SWIG_BLOCK_MAGIC2(satnogs, decoder_8b10b);