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/* -*- c++ -*- */
/*
* Copyright 2007,2010,2012,2016 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 "glfsr_source_b_impl.h"
#include <gnuradio/io_signature.h>
#include <stdexcept>
namespace gr {
namespace digital {
glfsr_source_b::sptr
glfsr_source_b::make(unsigned int degree, bool repeat, uint32_t mask, uint32_t seed)
{
return gnuradio::get_initial_sptr
(new glfsr_source_b_impl(degree, repeat, mask, seed));
}
glfsr_source_b_impl::glfsr_source_b_impl(unsigned int degree, bool repeat,
uint32_t mask, uint32_t seed)
: sync_block("glfsr_source_b",
io_signature::make(0, 0, 0),
io_signature::make(1, 1, sizeof(unsigned char))),
d_repeat(repeat), d_index(0),
d_length( ( ((uint32_t)1) << degree) - 1)
{
if(degree < 1 || degree > 32)
throw std::runtime_error("glfsr_source_b_impl: degree must be between 1 and 32 inclusive");
if(mask == 0)
mask = glfsr::glfsr_mask(degree);
d_glfsr = new glfsr(mask, seed);
}
glfsr_source_b_impl::~glfsr_source_b_impl()
{
delete d_glfsr;
}
uint32_t
glfsr_source_b_impl::mask() const
{
return d_glfsr->mask();
}
int
glfsr_source_b_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
char *out = (char*)output_items[0];
if((d_index > d_length) && d_repeat == false)
return WORK_DONE; /* once through the sequence */
int i;
for(i = 0; i < noutput_items; i++) {
out[i] = d_glfsr->next_bit();
d_index++;
if(d_index > d_length && d_repeat == false)
break;
}
return i;
}
} /* namespace digital */
} /* namespace gr */
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