correlate_access_code_bb.h

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/* -*- c++ -*- */
/*
 * Copyright 2005,2006,2011,2012 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_DIGITAL_CORRELATE_ACCESS_CODE_BB_H
#define INCLUDED_DIGITAL_CORRELATE_ACCESS_CODE_BB_H

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

namespace gr {
  namespace digital {

    /*!
     * \brief Examine input for specified access code, one bit at a time.
     * \ingroup packet_operators_blk
     * \ingroup deprecated_blk
     *
     * \details
     * input:  stream of bits, 1 bit per input byte (data in LSB)
     * output: stream of bits, 2 bits per output byte (data in LSB, flag in next higher bit)
     *
     * Each output byte contains two valid bits, the data bit, and the
     * flag bit. The LSB (bit 0) is the data bit, and is the original
     * input data, delayed 64 bits. Bit 1 is the flag bit and is 1 if
     * the corresponding data bit is the first data bit following the
     * access code. Otherwise the flag bit is 0.
     */
    class DIGITAL_API correlate_access_code_bb : virtual public sync_block
    {
    public:
      // gr::digital::correlate_access_code_bb::sptr
      typedef boost::shared_ptr<correlate_access_code_bb> sptr;

      /*!
       * Make a correlate_access_code block.
       *
       * \param access_code is represented with 1 byte per bit,
       *                    e.g., "010101010111000100" 
       * \param threshold maximum number of bits that may be wrong
       */
      static sptr make(const std::string &access_code, int threshold);

      /*!
       * Set a new access code.
       *
       * \param access_code is represented with 1 byte per bit,
       *                    e.g., "010101010111000100"
       */
      virtual bool set_access_code(const std::string &access_code) = 0;
    };

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

#endif /* INCLUDED_DIGITAL_CORRELATE_ACCESS_CODE_BB_H */