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/* -*- c++ -*- */
/*
* Copyright 2007,2010,2012,2016 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 "glfsr_source_f_impl.h"
#include <gnuradio/io_signature.h>
#include <stdexcept>
namespace gr {
namespace digital {
glfsr_source_f::sptr
glfsr_source_f::make(unsigned int degree, bool repeat, uint32_t mask, uint32_t seed)
{
return gnuradio::make_block_sptr<glfsr_source_f_impl>(degree, repeat, mask, seed);
}
glfsr_source_f_impl::glfsr_source_f_impl(unsigned int degree,
bool repeat,
uint32_t mask,
uint32_t seed)
: sync_block("glfsr_source_f",
io_signature::make(0, 0, 0),
io_signature::make(1, 1, sizeof(float))),
d_glfsr(mask ? mask : glfsr::glfsr_mask(degree), seed),
d_repeat(repeat),
d_index(0),
d_length((((uint32_t)1) << degree) - 1)
{
if (degree < 1 || degree > 32)
throw std::runtime_error(
"glfsr_source_f_impl: degree must be between 1 and 32 inclusive");
}
glfsr_source_f_impl::~glfsr_source_f_impl() {}
uint32_t glfsr_source_f_impl::mask() const { return d_glfsr.mask(); }
int glfsr_source_f_impl::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 WORK_DONE; /* 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;
}
} /* namespace digital */
} /* namespace gr */
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