frequency_modulator_fc_impl.cc

/* -*- c++ -*- */
/*
 * Copyright 2004,2010-2012,2018 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "frequency_modulator_fc_impl.h"
#include <gnuradio/fxpt.h>
#include <gnuradio/io_signature.h>
#include <gnuradio/math.h>
#include <cmath>

namespace gr {
namespace analog {

frequency_modulator_fc::sptr frequency_modulator_fc::make(float sensitivity)
{
    return gnuradio::make_block_sptr<frequency_modulator_fc_impl>(sensitivity);
}

frequency_modulator_fc_impl::frequency_modulator_fc_impl(float sensitivity)
    : sync_block("frequency_modulator_fc",
                 io_signature::make(1, 1, sizeof(float)),
                 io_signature::make(1, 1, sizeof(gr_complex))),
      d_sensitivity(sensitivity),
      d_phase(0)
{
}

frequency_modulator_fc_impl::~frequency_modulator_fc_impl() {}

int frequency_modulator_fc_impl::work(int noutput_items,
                                      gr_vector_const_void_star& input_items,
                                      gr_vector_void_star& output_items)
{
    const float* in = (const float*)input_items[0];
    gr_complex* out = (gr_complex*)output_items[0];

    for (int i = 0; i < noutput_items; i++) {
        d_phase = d_phase + d_sensitivity * in[i];

// place phase in [-pi, +pi[
#define F_PI ((float)(GR_M_PI))
        d_phase = std::fmod(d_phase + F_PI, 2.0f * F_PI) - F_PI;

        float oi, oq;

        int32_t angle = gr::fxpt::float_to_fixed(d_phase);
        gr::fxpt::sincos(angle, &oq, &oi);
        out[i] = gr_complex(oi, oq);
    }

    return noutput_items;
}

void frequency_modulator_fc_impl::setup_rpc()
{
#ifdef GR_CTRLPORT
    add_rpc_variable(
        rpcbasic_sptr(new rpcbasic_register_get<frequency_modulator_fc, float>(
            alias(),
            "sensitivity",
            &frequency_modulator_fc::sensitivity,
            pmt::mp(-1024.0f),
            pmt::mp(1024.0f),
            pmt::mp(0.0f),
            "",
            "Sensitivity",
            RPC_PRIVLVL_MIN,
            DISPTIME | DISPOPTSTRIP)));

    add_rpc_variable(
        rpcbasic_sptr(new rpcbasic_register_set<frequency_modulator_fc, float>(
            alias(),
            "sensitivity",
            &frequency_modulator_fc::set_sensitivity,
            pmt::mp(-1024.0f),
            pmt::mp(1024.0f),
            pmt::mp(0.0f),
            "",
            "sensitivity",
            RPC_PRIVLVL_MIN,
            DISPNULL)));
#endif /* GR_CTRLPORT */
}
} /* namespace analog */
} /* namespace gr */