/* -*- c++ -*- */

/*

 * Copyright 2008 Free Software Foundation, Inc.

 * 

 * 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_CPFSK_BC_H

#define INCLUDED_GR_CPFSK_BC_H

#include <gr_sync_interpolator.h>

class gr_cpfsk_bc;

typedef boost::shared_ptr<gr_cpfsk_bc> gr_cpfsk_bc_sptr;

gr_cpfsk_bc_sptr gr_make_cpfsk_bc(float k, float ampl, int samples_per_sym);

/*!

 * \brief Perform continuous phase 2-level frequency shift keying modulation 

 * on an input stream of unpacked bits.

 * \ingroup modulation_blk

 *

 * \param k                     modulation index

 * \param ampl                        output amplitude

 * \param samples_per_sym        number of output samples per input bit

 */

class gr_cpfsk_bc : public gr_sync_interpolator

{

private:

  friend gr_cpfsk_bc_sptr gr_make_cpfsk_bc(float k, float ampl, int samples_per_sym);

  gr_cpfsk_bc(float k, float ampl, int samples_per_sym);

  int   d_samples_per_sym;        // Samples per symbol, square pulse

  float d_freq;                        // Modulation index*pi/samples_per_sym

  float d_ampl;                        // Output amplitude

  float d_phase;                // Current phase

 public:

  ~gr_cpfsk_bc();

  void set_amplitude(float amplitude) { d_ampl = amplitude; }

  int work (int noutput_items,

            gr_vector_const_void_star &input_items,

            gr_vector_void_star &output_items);

};

#endif /* INCLUDED_GR_CPFSK_BC_H */