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/* -*- c++ -*- */
/*
* Copyright 2014 <+YOU OR YOUR COMPANY+>.
*
* This 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.
*
* This software 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 software; 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 <gnuradio/io_signature.h>
#include "controlled_rotator_cc_impl.h"
#include <math.h>
namespace gr {
namespace gsm {
controlled_rotator_cc::sptr
controlled_rotator_cc::make(double phase_inc, double samp_rate)
{
return gnuradio::get_initial_sptr
(new controlled_rotator_cc_impl(phase_inc, samp_rate));
}
/*
* The private constructor
*/
controlled_rotator_cc_impl::controlled_rotator_cc_impl(double phase_inc, double samp_rate)
: gr::sync_block("controlled_rotator_cc",
gr::io_signature::make2(1, 2, sizeof(gr_complex), sizeof(float)),
gr::io_signature::make(1, 1, sizeof(gr_complex)))
{
set_phase_inc(phase_inc);
set_samp_rate(samp_rate);
}
/*
* Our virtual destructor.
*/
controlled_rotator_cc_impl::~controlled_rotator_cc_impl()
{
}
void
controlled_rotator_cc_impl::set_phase_inc(double phase_inc)
{
d_phase_inc = phase_inc;
d_r.set_phase_incr( exp(gr_complex(0, (double)phase_inc)) );
}
void
controlled_rotator_cc_impl::set_samp_rate(double samp_rate)
{
d_samp_rate = samp_rate;
}
int
controlled_rotator_cc_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const gr_complex *in = (const gr_complex *)input_items[0];
gr_complex *out = (gr_complex *)output_items[0];
if(input_items.size() == 2) {
int ii=0;
const float *pp = (const float *)input_items[1];
while(ii < noutput_items){
//look for different values on phase increment control input
if(d_phase_inc != (*pp)){
set_phase_inc(*(pp)); //set new value of phase increment
float freq_offset_setting = (*(pp) / (2*M_PI)) * d_samp_rate; //send stream tag with a new value of the frequency offset
uint64_t offset = nitems_written(0);
pmt::pmt_t key = pmt::string_to_symbol("setting_freq_offset");
pmt::pmt_t value = pmt::from_double(freq_offset_setting);
add_item_tag(0,offset, key, value);
break;
}
pp++;
ii++;
}
}
d_r.rotateN(out, const_cast<gr_complex *>(in), noutput_items); //const_cast<gr_complex *> is workaround old implementation of rotateN that is still present in ubuntu 14.04 packages
return noutput_items;
}
} /* namespace gsm */
} /* namespace gr */
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