trickle.c
2.4 KB
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
92
93
94
95
96
97
/*
* Trickle implementation
*
* Copyright (C) 2013, 2014 INRIA.
* 2017 HAW Hamburg
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @author Eric Engel <eric.engel@fu-berlin.de>
* @author Cenk Gündoğan <cenk.guendogan@haw-hamburg.de>
*/
#include "inttypes.h"
#include "random.h"
#include "trickle.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
void trickle_callback(trickle_t *trickle)
{
/* Handle k=0 like k=infinity (according to RFC6206, section 6.5) */
if ((trickle->c < trickle->k) || (trickle->k == 0)) {
(*trickle->callback.func)(trickle->callback.args);
}
trickle_interval(trickle);
}
void trickle_interval(trickle_t *trickle)
{
assert(trickle->I > 0);
uint32_t old_interval = trickle->I;
uint32_t max_interval = trickle->Imin << trickle->Imax;
uint32_t diff = old_interval - trickle->t;
trickle->I *= 2;
if (trickle->I > max_interval) {
trickle->I = max_interval;
old_interval = max_interval / 2;
}
DEBUG("trickle: I == %" PRIu32 ", diff == %" PRIu32 "\n", trickle->I, diff);
trickle->c = 0;
/* old_interval == trickle->I / 2 */
trickle->t = random_uint32_range(old_interval, trickle->I);
trickle->msg_time = (trickle->t + diff) * MS_PER_SEC;
xtimer_set_msg64(&trickle->msg_timer, trickle->msg_time, &trickle->msg,
trickle->pid);
}
void trickle_reset_timer(trickle_t *trickle)
{
assert(trickle->I > trickle->Imin);
trickle_stop(trickle);
trickle->I = trickle->Imin;
trickle_interval(trickle);
}
void trickle_start(kernel_pid_t pid, trickle_t *trickle, uint16_t msg_type,
uint32_t Imin, uint8_t Imax, uint8_t k)
{
assert(Imin > 0);
assert((Imin << Imax) < (UINT32_MAX / 2));
trickle->pid = pid;
trickle->c = 0;
trickle->k = k;
trickle->Imin = Imin;
trickle->Imax = Imax;
trickle->I = trickle->t = random_uint32_range(trickle->Imin,
4 * trickle->Imin);
trickle->pid = pid;
trickle->msg.content.ptr = trickle;
trickle->msg.type = msg_type;
trickle_interval(trickle);
}
void trickle_stop(trickle_t *trickle)
{
xtimer_remove(&trickle->msg_timer);
}
void trickle_increment_counter(trickle_t *trickle)
{
trickle->c++;
}