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Fine-tuned the timing and phase lock optimization

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This commit is contained in:
adamdunkels 2010-03-31 20:27:15 +00:00
parent 02dc04cc6a
commit b43f7830b3
2 changed files with 26 additions and 16 deletions
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19
core/net/mac/contikimac.c
View File

@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: contikimac.c,v 1.20 2010/03/31 11:54:38 adamdunkels Exp $
* $Id: contikimac.c,v 1.21 2010/03/31 20:27:15 adamdunkels Exp $
*/
/**
@ -99,13 +99,15 @@ struct announcement_msg {
#define CYCLE_TIME (RTIMER_ARCH_SECOND / MAC_CHANNEL_CHECK_RATE)
#endif
#define MAX_PHASE_STROBES 12
#define MAX_PHASE_STROBE_TIME RTIMER_ARCH_SECOND / 20
#define CCA_COUNT_MAX 2
#define CCA_CHECK_TIME RTIMER_ARCH_SECOND / 8192
#define CCA_SLEEP_TIME RTIMER_ARCH_SECOND / 2000 //+ CCA_CHECK_TIME
#define CHECK_TIME (CCA_COUNT_MAX * (CCA_CHECK_TIME + CCA_SLEEP_TIME))
#define STROBE_TIME (CYCLE_TIME + 2 * CHECK_TIME)
#define STREAM_CCA_COUNT (CYCLE_TIME / (CCA_SLEEP_TIME + CCA_CHECK_TIME) - CCA_COUNT_MAX)
#define GUARD_TIME 7 * CHECK_TIME
@ -130,9 +132,6 @@ struct announcement_msg {
cycle. */
#define ANNOUNCEMENT_TIME (random_rand() % (ANNOUNCEMENT_PERIOD))
#define STROBE_WAIT_TIME (RTIMER_ARCH_SECOND / 600)
#define STROBE_TIME (CYCLE_TIME + 2 * CHECK_TIME)
#define ACK_LEN 3
@ -415,6 +414,12 @@ parse_announcements(void)
}
printf("\n"); */
if(adata.num / sizeof(struct announcement_data) > sizeof(struct announcement_msg)) {
/* Sanity check. The number of announcements is too large -
corrupt packet has been received. */
return 0;
}
for(i = 0; i < adata.num; ++i) {
/* printf("%d.%d: announcement %d: %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
@ -657,7 +662,7 @@ send_packet(mac_callback_t mac_callback, void *mac_callback_ptr)
watchdog_periodic();
if(is_known_receiver && strobes > MAX_PHASE_STROBES) {
if(is_known_receiver && !RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + MAX_PHASE_STROBE_TIME)) {
break;
}
@ -692,7 +697,6 @@ send_packet(mac_callback_t mac_callback, void *mac_callback_ptr)
#endif
len = NETSTACK_RADIO.read(ackbuf, ACK_LEN);
if(len == ACK_LEN) {
leds_on(LEDS_BLUE);
got_strobe_ack = 1;
// encounter_time = last_transmission_time;
encounter_time = now;
@ -775,7 +779,6 @@ send_packet(mac_callback_t mac_callback, void *mac_callback_ptr)
}
#endif /* WITH_PHASE_OPTIMIZATION */
leds_off(LEDS_BLUE);
return ret;
}
/*---------------------------------------------------------------------------*/

23
core/net/mac/phase.c
View File

@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: phase.c,v 1.6 2010/03/31 11:54:38 adamdunkels Exp $
* $Id: phase.c,v 1.7 2010/03/31 20:27:15 adamdunkels Exp $
*/
/**
@ -61,7 +61,7 @@ struct phase_queueitem {
MEMB(phase_memb, struct phase_queueitem, PHASE_QUEUESIZE);
#define DEBUG 1
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
@ -89,7 +89,7 @@ phase_update(const struct phase_list *list,
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 to %d.%d\n", e->noacks, neighbor->u8[0], neighbor->u8[1]);
PRINTF("phase noacks %d to %d.%d\n", e->noacks, neighbor->u8[0], neighbor->u8[1]);
e->noacks++;
if(e->noacks >= MAX_NOACKS) {
list_remove(*list->list, e);
@ -149,7 +149,7 @@ phase_wait(struct phase_list *list,
const rimeaddr_t *neighbor = packetbuf_addr(PACKETBUF_ADDR_RECEIVER);
if(rimeaddr_cmp(neighbor, &e->neighbor)) {
rtimer_clock_t wait, now, expected;
rtimer_clock_t wait, now, expected, additional_wait;
clock_time_t ctimewait;
/* We expect phases to happen every CYCLE_TIME time
@ -161,14 +161,21 @@ phase_wait(struct phase_list *list,
/* printf("neighbor phase 0x%02x (cycle 0x%02x)\n", e->time & (cycle_time - 1),
cycle_time);*/
additional_wait = 2 * e->noacks * wait_before;
/* if(e->noacks > 0) {
printf("additional wait %d\n", additional_wait);
}*/
now = RTIMER_NOW();
wait = (rtimer_clock_t)((e->time - now - e->noacks * wait_before) &
wait = (rtimer_clock_t)((e->time - now) &
(cycle_time - 1));
if(wait < wait_before) {
if(wait < wait_before + additional_wait) {
wait += cycle_time;
}
ctimewait = (CLOCK_SECOND * (wait - wait_before)) / RTIMER_ARCH_SECOND;
ctimewait = (CLOCK_SECOND * (wait - wait_before - additional_wait)) / RTIMER_ARCH_SECOND;
if(ctimewait > PHASE_DEFER_THRESHOLD) {
struct phase_queueitem *p;
@ -187,7 +194,7 @@ phase_wait(struct phase_list *list,
}
}
expected = now + wait - wait_before;
expected = now + wait - wait_before - additional_wait;
if(!RTIMER_CLOCK_LT(expected, now)) {
/* Wait until the receiver is expected to be awake */
while(RTIMER_CLOCK_LT(RTIMER_NOW(), expected)) {