7bab9316da
* Low-power streaming. Experimental support for a low-power mode which allows rapid exchange of packets with a 16% duty cycle. Does not seem to function correctly yet though. * Phase locking. When the phase of a neighbor has been detected, the sender assumes that the neighbor will keeps it phase and does not send more strobes than necessary to hit the receiver's channel check - even if the receiver does not acknowledge the reception of the strobes when it should have been awake. Instead, the sender stops strobing and tries again at a later time.
206 lines
6.8 KiB
C
206 lines
6.8 KiB
C
/*
|
|
* Copyright (c) 2010, Swedish Institute of Computer Science.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
* $Id: phase.c,v 1.4 2010/03/14 22:59:23 adamdunkels Exp $
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Common functionality for phase optimization in duty cycling radio protocols
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*/
|
|
|
|
#include "net/mac/phase.h"
|
|
#include "net/rime/packetbuf.h"
|
|
#include "sys/clock.h"
|
|
#include "lib/memb.h"
|
|
#include "net/rime/ctimer.h"
|
|
#include "net/rime/queuebuf.h"
|
|
#include "dev/watchdog.h"
|
|
#include "dev/leds.h"
|
|
|
|
struct phase_queueitem {
|
|
struct ctimer timer;
|
|
mac_callback_t mac_callback;
|
|
void *mac_callback_ptr;
|
|
struct queuebuf *q;
|
|
};
|
|
|
|
#define PHASE_DEFER_THRESHOLD 2
|
|
#define PHASE_QUEUESIZE 8
|
|
|
|
#define MAX_NOACKS 3
|
|
|
|
MEMB(phase_memb, struct phase_queueitem, PHASE_QUEUESIZE);
|
|
|
|
#define DEBUG 1
|
|
#if DEBUG
|
|
#include <stdio.h>
|
|
#define PRINTF(...) printf(__VA_ARGS__)
|
|
#define PRINTDEBUG(...) printf(__VA_ARGS__)
|
|
#else
|
|
#define PRINTF(...)
|
|
#define PRINTDEBUG(...)
|
|
#endif
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
phase_update(const struct phase_list *list,
|
|
const rimeaddr_t * neighbor, rtimer_clock_t time,
|
|
int mac_status)
|
|
{
|
|
struct phase *e;
|
|
|
|
/* If we have an entry for this neighbor already, we renew it. */
|
|
for(e = list_head(*list->list); e != NULL; e = e->next) {
|
|
if(rimeaddr_cmp(neighbor, &e->neighbor)) {
|
|
e->time = time;
|
|
|
|
/* If the neighbor didn't reply to us, it may have switched
|
|
phase (rebooted). We try a number of transmissions to it
|
|
before we drop it from the phase list. */
|
|
if(mac_status == MAC_TX_NOACK) {
|
|
printf("phase noacks %d\n", e->noacks);
|
|
e->noacks++;
|
|
if(e->noacks >= MAX_NOACKS) {
|
|
list_remove(*list->list, e);
|
|
memb_free(&phase_memb, e);
|
|
return;
|
|
}
|
|
} else if(mac_status == MAC_TX_OK) {
|
|
e->noacks = 0;
|
|
}
|
|
|
|
/* Make sure this entry is first on the list so subsequent
|
|
searches are faster. */
|
|
list_remove(*list->list, e);
|
|
list_push(*list->list, e);
|
|
break;
|
|
}
|
|
}
|
|
/* No matching phase was found, so we allocate a new one. */
|
|
if(mac_status == MAC_TX_OK && e == NULL) {
|
|
e = memb_alloc(list->memb);
|
|
if(e == NULL) {
|
|
/* We could not allocate memory for this phase, so we drop
|
|
the last item on the list and reuse it for our phase. */
|
|
e = list_chop(*list->list);
|
|
}
|
|
rimeaddr_copy(&e->neighbor, neighbor);
|
|
e->time = time;
|
|
e->noacks = 0;
|
|
list_push(*list->list, e);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
send_packet(void *ptr)
|
|
{
|
|
struct phase_queueitem *p = ptr;
|
|
|
|
queuebuf_to_packetbuf(p->q);
|
|
queuebuf_free(p->q);
|
|
memb_free(&phase_memb, p);
|
|
NETSTACK_RDC.send(p->mac_callback, p->mac_callback_ptr);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
phase_status_t
|
|
phase_wait(struct phase_list *list,
|
|
const rimeaddr_t *neighbor, rtimer_clock_t cycle_time,
|
|
rtimer_clock_t wait_before,
|
|
mac_callback_t mac_callback, void *mac_callback_ptr)
|
|
{
|
|
struct phase *e;
|
|
|
|
/* We go through the list of phases to find if we have recorded
|
|
an phase with this particular neighbor. If so, we can compute
|
|
the time for the next expected phase and setup a ctimer to
|
|
switch on the radio just before the phase. */
|
|
for(e = list_head(*list->list); e != NULL; e = e->next) {
|
|
const rimeaddr_t *neighbor = packetbuf_addr(PACKETBUF_ADDR_RECEIVER);
|
|
|
|
if(rimeaddr_cmp(neighbor, &e->neighbor)) {
|
|
rtimer_clock_t wait, now, expected;
|
|
clock_time_t ctimewait;
|
|
|
|
/* We expect phases to happen every CYCLE_TIME time
|
|
units. The next expected phase is at time e->time +
|
|
CYCLE_TIME. To compute a relative offset, we subtract
|
|
with clock_time(). Because we are only interested in turning
|
|
on the radio within the CYCLE_TIME period, we compute the
|
|
waiting time with modulo CYCLE_TIME. */
|
|
|
|
now = RTIMER_NOW();
|
|
wait = (rtimer_clock_t)((e->time - now) & (cycle_time - 1));
|
|
if(wait < wait_before) {
|
|
wait += cycle_time;
|
|
}
|
|
|
|
ctimewait = (CLOCK_SECOND * (wait - wait_before)) / RTIMER_ARCH_SECOND;
|
|
|
|
if(ctimewait > PHASE_DEFER_THRESHOLD) {
|
|
struct phase_queueitem *p;
|
|
|
|
p = memb_alloc(&phase_memb);
|
|
if(p != NULL) {
|
|
p->q = queuebuf_new_from_packetbuf();
|
|
if(p->q != NULL) {
|
|
p->mac_callback = mac_callback;
|
|
p->mac_callback_ptr = mac_callback_ptr;
|
|
ctimer_set(&p->timer, ctimewait, send_packet, p);
|
|
return PHASE_DEFERRED;
|
|
} else {
|
|
memb_free(&phase_memb, p);
|
|
}
|
|
}
|
|
}
|
|
|
|
expected = now + wait - wait_before;
|
|
if(!RTIMER_CLOCK_LT(expected, now)) {
|
|
/* Wait until the receiver is expected to be awake */
|
|
while(RTIMER_CLOCK_LT(RTIMER_NOW(), expected)) {
|
|
watchdog_periodic();
|
|
}
|
|
}
|
|
return PHASE_SEND_NOW;
|
|
}
|
|
}
|
|
return PHASE_UNKNOWN;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
phase_init(struct phase_list *list)
|
|
{
|
|
list_init(*list->list);
|
|
memb_init(list->memb);
|
|
memb_init(&phase_memb);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|