blob: 7e70f6512bb4fe9d1578e5364f87ec9cabf0cd7c (
plain)
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
|
/* -*- 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 <blocks/api.h>
#include <blocks/lfsr_15_1_0.h>
namespace gr {
namespace blocks {
/*!
* \brief generate pseudo-random sequence of length 32768 bits.
* \ingroup misc
*
* 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 */
|
