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/* -*- c++ -*- */
/*
* Copyright 2004,2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_GRI_LFSR_32k_H
#define INCLUDED_GRI_LFSR_32k_H
#include <gnuradio/blocks/api.h>
#include <gnuradio/blocks/lfsr_15_1_0.h>
namespace gr {
namespace blocks {
/*!
* \brief generate pseudo-random sequence of length 32768 bits.
* \ingroup misc
*
* \details
* This is based on gri_lfsr_15_1_0 with an extra 0 added at the
* end of the sequence.
*/
class BLOCKS_API lfsr_32k
{
private:
lfsr_15_1_0 d_lfsr;
unsigned int d_count;
public:
lfsr_32k() { reset(); }
void reset()
{
d_lfsr.reset();
d_count = 0;
}
int next_bit()
{
if (d_count == 32767) {
d_count = 0;
return 0;
}
d_count++;
return d_lfsr.next_bit();
}
int next_byte()
{
int v = 0;
for (int i = 0; i < 8; i++) {
v >>= 1;
if (next_bit())
v |= 0x80;
}
return v;
}
int next_short()
{
int v = 0;
for (int i = 0; i < 16; i++) {
v >>= 1;
if (next_bit())
v |= 0x8000;
}
return v;
}
};
} /* namespace blocks */
} /* namespace gr */
#endif /* INCLUDED_GRI_LFSR_32k_H */
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