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
|
/* -*- c++ -*- */
/*
* Copyright 2007,2010,2012 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 <digital_glfsr_source_b.h>
#include <gri_glfsr.h>
#include <gr_io_signature.h>
#include <stdexcept>
digital_glfsr_source_b_sptr
digital_make_glfsr_source_b(int degree, bool repeat, int mask, int seed)
{
return gnuradio::get_initial_sptr(new digital_glfsr_source_b
(degree, repeat, mask, seed));
}
digital_glfsr_source_b::digital_glfsr_source_b(int degree, bool repeat,
int mask, int seed)
: gr_sync_block ("glfsr_source_b",
gr_make_io_signature (0, 0, 0),
gr_make_io_signature (1, 1, sizeof(unsigned char))),
d_repeat(repeat),
d_index(0)
{
if (degree < 1 || degree > 32)
throw std::runtime_error("digital_glfsr_source_b: degree must be between 1 and 32 inclusive");
d_length = (unsigned int)((1ULL << degree)-1);
if (mask == 0)
mask = gri_glfsr::glfsr_mask(degree);
d_glfsr = new gri_glfsr(mask, seed);
}
digital_glfsr_source_b::~digital_glfsr_source_b()
{
delete d_glfsr;
}
int
digital_glfsr_source_b::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 -1; /* 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;
}
int
digital_glfsr_source_b::mask() const
{
return d_glfsr->mask();
}
|
