132 lines
3.8 KiB
C++
132 lines
3.8 KiB
C++
/* -*- c++ -*- */
|
|
/*
|
|
* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
|
|
*
|
|
* Copyright (C) 2016, Libre Space Foundation <http://librespacefoundation.org/>
|
|
*
|
|
* This program 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 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <gnuradio/io_signature.h>
|
|
#include "cw_matched_filter_ff_impl.h"
|
|
|
|
#include <volk/volk.h>
|
|
#include <gnuradio/fxpt_nco.h>
|
|
|
|
namespace gr {
|
|
namespace satnogs {
|
|
|
|
cw_matched_filter_ff::sptr
|
|
cw_matched_filter_ff::make(double sampling_rate, double carrier_freq,
|
|
size_t wpm, bool energy_out)
|
|
{
|
|
return gnuradio::get_initial_sptr
|
|
(new cw_matched_filter_ff_impl(sampling_rate, carrier_freq,
|
|
wpm, energy_out));
|
|
}
|
|
|
|
/*
|
|
* The private constructor
|
|
*/
|
|
cw_matched_filter_ff_impl::cw_matched_filter_ff_impl (double sampling_rate,
|
|
double carrier_freq,
|
|
size_t wpm,
|
|
bool energy_out) :
|
|
gr::sync_block ("cw_matched_filter_ff",
|
|
gr::io_signature::make (1, 1, sizeof(float)),
|
|
gr::io_signature::make (1, 1, sizeof(float))),
|
|
d_samp_rate(sampling_rate),
|
|
d_dot_duration(1.2/wpm),
|
|
d_produce_enrg(energy_out),
|
|
d_dot_samples(d_dot_duration / (1.0 / sampling_rate))
|
|
{
|
|
const int alignment_multiple = volk_get_alignment() / sizeof(float);
|
|
set_alignment(std::max(1,alignment_multiple));
|
|
set_history(d_dot_samples);
|
|
|
|
d_sin_wave = (float *)volk_malloc(d_dot_samples * sizeof(float), 32);
|
|
if(!d_sin_wave){
|
|
throw std::runtime_error("Could not allocate sine wave buffer");
|
|
}
|
|
|
|
/* Register the input port for frequency change messages */
|
|
message_port_register_in(pmt::mp("freq"));
|
|
set_msg_handler(pmt::mp("freq"),
|
|
boost::bind(&cw_matched_filter_ff_impl::new_freq_msg_handler,
|
|
this, _1));
|
|
|
|
/* Now fill the buffer with the appropriate sine wave */
|
|
gr::fxpt_nco nco;
|
|
nco.set_freq(2 * M_PI * carrier_freq / sampling_rate);
|
|
nco.sin(d_sin_wave, d_dot_samples, 1.0);
|
|
}
|
|
|
|
/*
|
|
* Our virtual destructor.
|
|
*/
|
|
cw_matched_filter_ff_impl::~cw_matched_filter_ff_impl()
|
|
{
|
|
volk_free(d_sin_wave);
|
|
}
|
|
|
|
void
|
|
cw_matched_filter_ff_impl::new_freq_msg_handler (pmt::pmt_t msg)
|
|
{
|
|
if(pmt::is_pair(msg)){
|
|
set_new_freq(pmt::to_double(pmt::cdr(msg)));
|
|
}
|
|
}
|
|
|
|
int
|
|
cw_matched_filter_ff_impl::work (int noutput_items,
|
|
gr_vector_const_void_star &input_items,
|
|
gr_vector_void_star &output_items)
|
|
{
|
|
boost::mutex::scoped_lock lock (d_mutex);
|
|
const float *in = (const float *) input_items[0];
|
|
float *out = (float *) output_items[0];
|
|
|
|
for (int i = 0; i < noutput_items; i++) {
|
|
volk_32f_x2_dot_prod_32f (out + i, in + i, d_sin_wave, d_dot_samples);
|
|
}
|
|
if (d_produce_enrg) {
|
|
volk_32f_s32f_power_32f (out, out, 2, noutput_items);
|
|
}
|
|
|
|
return noutput_items;
|
|
}
|
|
|
|
void
|
|
cw_matched_filter_ff_impl::set_new_freq (double freq)
|
|
{
|
|
gr::fxpt_nco nco;
|
|
nco.set_freq(2 * M_PI * freq / d_samp_rate);
|
|
nco.sin(d_sin_wave, d_dot_samples, 1.0);
|
|
}
|
|
|
|
void
|
|
cw_matched_filter_ff_impl::set_new_freq_locked(double freq)
|
|
{
|
|
boost::mutex::scoped_lock lock(d_mutex);
|
|
set_new_freq(freq);
|
|
}
|
|
|
|
} /* namespace satnogs */
|
|
} /* namespace gr */
|
|
|