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Back off a guard time for every non-ack packet

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This commit is contained in:
adamdunkels 2010-03-29 21:50:01 +00:00
parent 1241aa34d0
commit b4b7e942b6
1 changed files with 13 additions and 10 deletions
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17
core/net/mac/phase.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: phase.c,v 1.4 2010/03/14 22:59:23 adamdunkels Exp $
* $Id: phase.c,v 1.5 2010/03/29 21:50:01 adamdunkels Exp $
*/
/**
@ -81,7 +81,9 @@ phase_update(const struct phase_list *list,
/* 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)) {
if(mac_status == MAC_TX_OK) {
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
@ -139,10 +141,10 @@ phase_wait(struct phase_list *list,
{
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. */
/* We go through the list of phases to find if we have recorded a
phase for 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);
@ -157,8 +159,10 @@ phase_wait(struct phase_list *list,
on the radio within the CYCLE_TIME period, we compute the
waiting time with modulo CYCLE_TIME. */
/* printf("neighbor phase 0x%02x (cycle 0x%02x)\n", e->time & (cycle_time - 1),
cycle_time);*/
now = RTIMER_NOW();
wait = (rtimer_clock_t)((e->time - now) & (cycle_time - 1));
wait = (rtimer_clock_t)((e->time - now - e->noacks * cycle_time) & (cycle_time - 1));
if(wait < wait_before) {
wait += cycle_time;
}
@ -186,7 +190,6 @@ phase_wait(struct phase_list *list,
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;