GNU Radio 3.6.4 C++ API
digital_correlate_access_code_bb.h
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/* -*- c++ -*- */
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/*
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* Copyright 2005,2006,2011 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef INCLUDED_DIGITAL_CORRELATE_ACCESS_CODE_BB_H
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#define INCLUDED_DIGITAL_CORRELATE_ACCESS_CODE_BB_H
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#include <
digital_api.h
>
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#include <
gr_sync_block.h
>
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#include <string>
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class
digital_correlate_access_code_bb
;
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typedef
boost::shared_ptr<digital_correlate_access_code_bb>
digital_correlate_access_code_bb_sptr
;
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/*!
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* \param access_code is represented with 1 byte per bit, e.g., "010101010111000100"
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* \param threshold maximum number of bits that may be wrong
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*/
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DIGITAL_API
digital_correlate_access_code_bb_sptr
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digital_make_correlate_access_code_bb
(
const
std::string &access_code,
int
threshold);
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/*!
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* \brief Examine input for specified access code, one bit at a time.
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* \ingroup sync_blk
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* \ingroup digital
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*
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* input: stream of bits, 1 bit per input byte (data in LSB)
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* output: stream of bits, 2 bits per output byte (data in LSB, flag in next higher bit)
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*
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* Each output byte contains two valid bits, the data bit, and the
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* flag bit. The LSB (bit 0) is the data bit, and is the original
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* input data, delayed 64 bits. Bit 1 is the
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* flag bit and is 1 if the corresponding data bit is the first data
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* bit following the access code. Otherwise the flag bit is 0.
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*/
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class
DIGITAL_API
digital_correlate_access_code_bb
:
public
gr_sync_block
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{
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friend
DIGITAL_API
digital_correlate_access_code_bb_sptr
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digital_make_correlate_access_code_bb
(
const
std::string &access_code,
int
threshold);
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private
:
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unsigned
long
long
d_access_code;
// access code to locate start of packet
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// access code is left justified in the word
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unsigned
long
long
d_data_reg;
// used to look for access_code
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unsigned
long
long
d_flag_reg;
// keep track of decisions
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unsigned
long
long
d_flag_bit;
// mask containing 1 bit which is location of new flag
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unsigned
long
long
d_mask;
// masks access_code bits (top N bits are set where
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// N is the number of bits in the access code)
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unsigned
int
d_threshold;
// how many bits may be wrong in sync vector
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protected
:
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digital_correlate_access_code_bb
(
const
std::string &access_code,
int
threshold);
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public
:
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~
digital_correlate_access_code_bb
();
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int
work
(
int
noutput_items,
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gr_vector_const_void_star
&input_items,
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gr_vector_void_star
&output_items);
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/*!
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* \param access_code is represented with 1 byte per bit, e.g., "010101010111000100"
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*/
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bool
set_access_code (
const
std::string &access_code);
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};
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#endif
/* INCLUDED_DIGITAL_CORRELATE_ACCESS_CODE_BB_H */
gnuradio
gr-digital
include
digital_correlate_access_code_bb.h
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