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

/*

 * Copyright 2008,2010 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <gr_cpfsk_bc.h>

#include <gr_io_signature.h>

#include <gr_expj.h>

#define M_TWOPI (2*M_PI)

gr_cpfsk_bc_sptr 

gr_make_cpfsk_bc(float k, float ampl, int samples_per_sym)

{

  return gnuradio::get_initial_sptr(new gr_cpfsk_bc(k, ampl, samples_per_sym));

}

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

  : gr_sync_interpolator("cpfsk_bc",

                         gr_make_io_signature(1, 1, sizeof(char)),

                         gr_make_io_signature(1, 1, sizeof(gr_complex)),

                         samples_per_sym)

{

  d_samples_per_sym = samples_per_sym;

  d_freq = k*M_PI/samples_per_sym;

  d_ampl = ampl;

  d_phase = 0.0;

}

gr_cpfsk_bc::~gr_cpfsk_bc()

{

}

int 

gr_cpfsk_bc::work(int noutput_items,

                      gr_vector_const_void_star &input_items,

                      gr_vector_void_star &output_items)

{

  const char *in = (const char *)input_items[0];

  gr_complex *out = (gr_complex *)output_items[0];

  for (int i = 0; i < noutput_items/d_samples_per_sym; i++) {

    for (int j = 0; j < d_samples_per_sym; j++) {

      if (in[i] == 1)

        d_phase += d_freq;

      else

        d_phase -= d_freq;

      while (d_phase > M_TWOPI)

        d_phase -= M_TWOPI;

      while (d_phase < -M_TWOPI)

        d_phase += M_TWOPI;

      *out++ = gr_expj(d_phase)*d_ampl;

    }

  }

  return noutput_items;

}