/usr/include/gnuradio/blocks/lfsr_32k.h is in gnuradio-dev 3.7.9.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 | /* -*- c++ -*- */
/*
* Copyright 2004,2013 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.
*/
#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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