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/* -*- c++ -*- */
/*
* Copyright 2007,2012 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.
*/
#ifndef INCLUDED_GR_GLFSR_SOURCE_B_H
#define INCLUDED_GR_GLFSR_SOURCE_B_H
#include <digital_api.h>
#include <gr_sync_block.h>
class gri_glfsr;
class digital_glfsr_source_b;
typedef boost::shared_ptr<digital_glfsr_source_b> digital_glfsr_source_b_sptr;
DIGITAL_API digital_glfsr_source_b_sptr
digital_make_glfsr_source_b(int degree, bool repeat=true,
int mask=0, int seed=1);
/*!
* \brief Galois LFSR pseudo-random source
* \ingroup source_blk
*
* \param degree Degree of shift register must be in [1, 32]. If mask
* is 0, the degree determines a default mask (see
* digital_impl_glfsr.cc for the mapping).
* \param repeat Set to repeat sequence.
* \param mask Allows a user-defined bit mask for indexes of the shift
* register to feed back.
* \param seed Initial setting for values in shift register.
*/
class DIGITAL_API digital_glfsr_source_b : public gr_sync_block
{
private:
friend DIGITAL_API digital_glfsr_source_b_sptr
digital_make_glfsr_source_b(int degree, bool repeat,
int mask, int seed);
gri_glfsr *d_glfsr;
bool d_repeat;
unsigned int d_index;
unsigned int d_length;
digital_glfsr_source_b(int degree, bool repeat,
int mask, int seed);
public:
~digital_glfsr_source_b();
int work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items);
unsigned int period() const { return d_length; }
int mask() const;
};
#endif /* INCLUDED_GR_GLFSR_SOURCE_B_H */
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