glfsr_source_b.h

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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 <gnuradio/digital/api.h>
#include <gnuradio/sync_block.h>

namespace gr {
  namespace digital {

    /*!
     * \brief Galois LFSR pseudo-random source
     * \ingroup waveform_generators_blk
     */
    class DIGITAL_API glfsr_source_b : virtual public sync_block
    {
    public:
      // gr::digital::glfsr_source_b::sptr
      typedef boost::shared_ptr<glfsr_source_b> sptr;

      /*!
       * Make a Galois LFSR pseudo-random source block.
       *
       * \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.
       */
      static sptr make(int degree, bool repeat=true,
                       int mask=0, int seed=1);
        
      virtual unsigned int period() const = 0;
      virtual int mask() const = 0;
    };

  } /* namespace digital */
} /* namespace gr */

#endif /* INCLUDED_GR_GLFSR_SOURCE_B_H */