/* -*- 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.

 */

#ifndef INCLUDED_GR_LFSR_32K_SOURCE_S_H

#define INCLUDED_GR_LFSR_32K_SOURCE_S_H

#include <gr_core_api.h>

#include <gr_sync_block.h>

#include <gri_lfsr_32k.h>

class gr_lfsr_32k_source_s;

typedef boost::shared_ptr<gr_lfsr_32k_source_s> gr_lfsr_32k_source_s_sptr;

GR_CORE_API gr_lfsr_32k_source_s_sptr gr_make_lfsr_32k_source_s ();

/*!

 * \brief LFSR pseudo-random source with period of 2^15 bits (2^11 shorts)

 * \ingroup source_blk

 *

 * This source is typically used along with gr_check_lfsr_32k_s to test

 * the USRP using its digital loopback mode.

 */

class GR_CORE_API gr_lfsr_32k_source_s : public gr_sync_block

{

  friend GR_CORE_API gr_lfsr_32k_source_s_sptr gr_make_lfsr_32k_source_s ();

  static const int BUFSIZE = 2048 - 1;        // ensure pattern isn't packet aligned

  int                d_index;

  short                d_buffer[BUFSIZE];

  gr_lfsr_32k_source_s ();

 public:

  virtual int work (int noutput_items,

                    gr_vector_const_void_star &input_items,

                    gr_vector_void_star &output_items);

};

#endif