baz_acars_decoder.h
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/* -*- c++ -*- */
/*
* Copyright 2004 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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, or (at your option)
* any later version.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
/*
* gr-baz by Balint Seeber (http://spench.net/contact)
* Information, documentation & samples: http://wiki.spench.net/wiki/gr-baz
*/
#ifndef INCLUDED_BAZ_ACARS_H
#define INCLUDED_BAZ_ACARS_H
#include <gnuradio/sync_block.h>
#include <gnuradio/msg_queue.h>
#include <string>
class baz_acars_decoder;
/*
* 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<baz_acars_decoder> baz_acars_decoder_sptr;
/*!
* \brief Return a shared_ptr to a new instance of baz_acars_decoder.
*
* To avoid accidental use of raw pointers, baz_acars_decoder's
* constructor is private. baz_acars_decoder is the public
* interface for creating new instances.
*/
baz_acars_decoder_sptr baz_make_acars_decoder (gr::msg_queue::sptr msgq);
/*!
* \brief acars a stream of floats.
* \ingroup block
*
* This uses the preferred technique: subclassing gr::sync_block.
*/
class baz_acars_decoder : public gr::sync_block
{
private:
// The friend declaration allows baz_acars_decoder to
// access the private constructor.
friend baz_acars_decoder_sptr baz_make_acars_decoder (gr::msg_queue::sptr msgq);
baz_acars_decoder (gr::msg_queue::sptr msgq); // private constructor
enum state_t
{
STATE_SEARCHING,
//STATE_BITSYNC,
//STATE_CHARSYNC,
STATE_ASSEMBLE,
//STATE_DLE,
//STATE_END
};
const static int MAX_ACARS_PACKET_SIZE = 252;
enum flags_t
{
FLAG_NONE = 0x00,
FLAG_SOH = 0x01,
FLAG_STX = 0x02,
FLAG_ETX = 0x04,
FLAG_DEL = 0x08
};
#pragma pack(push)
#pragma pack(1)
struct packet
{
float reference_level;
float prekey_average;
int prekey_ones;
unsigned char byte_data[MAX_ACARS_PACKET_SIZE];
unsigned char byte_error[MAX_ACARS_PACKET_SIZE];
int parity_error_count;
int byte_count;
unsigned char flags;
int etx_index;
};
#pragma pack(pop)
state_t d_state;
unsigned long d_preamble_state;
int d_preamble_threshold;
struct packet d_current_packet;
int d_bit_counter;
unsigned char d_current_byte;
int d_byte_counter;
unsigned char d_flags;
gr::msg_queue::sptr d_msgq;
unsigned char d_prev_bit;
float d_frequency;
std::string d_station_name;
public:
~baz_acars_decoder (); // public destructor
void set_preamble_threshold(int threshold);
void set_frequency(float frequency);
void set_station_name(const char* station_name);
inline int preamble_threshold() const
{ return d_preamble_threshold; }
inline float frequency() const
{ return d_frequency; }
inline const char* station_name() const
{ return d_station_name.c_str(); }
int work (int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);
};
#endif /* INCLUDED_BAZ_ACARS_CC_H */
baz_make_acars_decoder
baz_acars_decoder_sptr baz_make_acars_decoder(gr::msg_queue::sptr msgq)
Return a shared_ptr to a new instance of baz_acars_decoder.
baz_acars_decoder
acars a stream of floats.
Definition baz_acars_decoder.h:66
baz_acars_decoder::baz_make_acars_decoder
friend baz_acars_decoder_sptr baz_make_acars_decoder(gr::msg_queue::sptr msgq)
Return a shared_ptr to a new instance of baz_acars_decoder.
baz_acars_decoder::preamble_threshold
int preamble_threshold() const
Definition baz_acars_decoder.h:131
baz_acars_decoder::~baz_acars_decoder
~baz_acars_decoder()
baz_acars_decoder::set_frequency
void set_frequency(float frequency)
baz_acars_decoder::set_preamble_threshold
void set_preamble_threshold(int threshold)
baz_acars_decoder::station_name
const char * station_name() const
Definition baz_acars_decoder.h:135
baz_acars_decoder::set_station_name
void set_station_name(const char *station_name)
baz_acars_decoder::frequency
float frequency() const
Definition baz_acars_decoder.h:133
baz_acars_decoder::work
int work(int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)