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/* -*- c++ -*- */
/*
* Copyright 2008,2010,2012,2018 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 "cpfsk_bc_impl.h"
#include <gnuradio/io_signature.h>
#include <gnuradio/expj.h>
#include <gnuradio/math.h>
namespace gr {
namespace analog {
cpfsk_bc::sptr cpfsk_bc::make(float k, float ampl, int samples_per_sym)
{
return gnuradio::get_initial_sptr(new cpfsk_bc_impl(k, ampl, samples_per_sym));
}
cpfsk_bc_impl::cpfsk_bc_impl(float k, float ampl, int samples_per_sym)
: sync_interpolator("cpfsk_bc",
io_signature::make(1, 1, sizeof(char)),
io_signature::make(1, 1, sizeof(gr_complex)),
samples_per_sym)
{
d_samples_per_sym = samples_per_sym;
d_freq = k * GR_M_PI / samples_per_sym;
d_ampl = ampl;
d_phase = 0.0;
}
cpfsk_bc_impl::~cpfsk_bc_impl() {}
int cpfsk_bc_impl::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 > GR_M_TWOPI)
d_phase -= GR_M_TWOPI;
while (d_phase < -GR_M_TWOPI)
d_phase += GR_M_TWOPI;
*out++ = gr_expj(d_phase) * d_ampl;
}
}
return noutput_items;
}
} /* namespace analog */
} /* namespace gr */
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