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/* -*- c++ -*- */
/*
* Copyright 2007,2010,2012 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* 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 <digital_glfsr_source_f.h>
#include <gri_glfsr.h>
#include <gr_io_signature.h>
#include <stdexcept>
digital_glfsr_source_f_sptr
digital_make_glfsr_source_f(int degree, bool repeat, int mask, int seed)
{
return gnuradio::get_initial_sptr(new digital_glfsr_source_f
(degree, repeat, mask, seed));
}
digital_glfsr_source_f::digital_glfsr_source_f(int degree, bool repeat,
int mask, int seed)
: gr_sync_block ("glfsr_source_f",
gr_make_io_signature (0, 0, 0),
gr_make_io_signature (1, 1, sizeof(float))),
d_repeat(repeat),
d_index(0)
{
if (degree < 1 || degree > 32)
throw std::runtime_error("digital_glfsr_source_f: degree must be between 1 and 32 inclusive");
d_length = (unsigned int)((1ULL << degree)-1);
if (mask == 0)
mask = gri_glfsr::glfsr_mask(degree);
d_glfsr = new gri_glfsr(mask, seed);
}
digital_glfsr_source_f::~digital_glfsr_source_f()
{
delete d_glfsr;
}
int
digital_glfsr_source_f::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
float *out = (float *) output_items[0];
if ((d_index > d_length) && d_repeat == false)
return -1; /* once through the sequence */
int i;
for (i = 0; i < noutput_items; i++) {
out[i] = (float)d_glfsr->next_bit()*2.0-1.0;
d_index++;
if (d_index > d_length && d_repeat == false)
break;
}
return i;
}
int
digital_glfsr_source_f::mask() const
{
return d_glfsr->mask();
}
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