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glfsr.h
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/* -*- c++ -*- */
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/*
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* Copyright 2007,2012 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_GLFSR_H
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#define INCLUDED_DIGITAL_GLFSR_H
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#include <
gnuradio/digital/api.h
>
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namespace
gr {
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namespace
digital {
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/*!
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* \brief Galois Linear Feedback Shift Register using specified polynomial mask
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* \ingroup waveform_generators_blk
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*
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* \details
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* Generates a maximal length pseudo-random sequence of length 2^degree-1
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*/
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class
DIGITAL_API
glfsr
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{
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private
:
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int
d_shift_register;
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int
d_mask;
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public
:
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glfsr
(
int
mask,
int
seed) { d_shift_register = seed; d_mask = mask; }
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~
glfsr
();
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static
int
glfsr_mask(
int
degree);
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unsigned
char
next_bit()
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{
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unsigned
char
bit = d_shift_register & 1;
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d_shift_register >>= 1;
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if
(bit)
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d_shift_register ^= d_mask;
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return
bit;
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}
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int
mask
()
const
{
return
d_mask; }
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};
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}
/* namespace digital */
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}
/* namespace gr */
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#endif
/* INCLUDED_DIGITAL_GLFSR_H */
gr-digital
include
gnuradio
digital
glfsr.h
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