/*---------------------------------------------------------------------------*/
static void
schedule_dao(rpl_instance_t *instance, clock_time_t latency)
{
clock_time_t expiration_time;
if(rpl_get_mode() == RPL_MODE_FEATHER) {
return;
}
expiration_time = etimer_expiration_time(&instance->dao_timer.etimer);
if(!etimer_expired(&instance->dao_timer.etimer)) {
PRINTF("RPL: DAO timer already scheduled\n\r");
} else {
if(latency != 0) {
expiration_time = latency / 2 +
(random_rand() % (latency));
} else {
expiration_time = 0;
}
PRINTF("RPL: Scheduling DAO timer %u ticks in the future\n\r",
(unsigned)expiration_time);
ctimer_set(&instance->dao_timer, expiration_time,
handle_dao_timer, instance);
set_dao_lifetime_timer(instance);
}
}
void
rpl_schedule_dao(rpl_dag_t *dag)
{
clock_time_t expiration_time;
expiration_time = etimer_expiration_time(&dag->dao_timer.etimer);
if(!etimer_expired(&dag->dao_timer.etimer)) {
PRINTF("RPL: DAO timer already scheduled");
} else {
expiration_time = DEFAULT_DAO_LATENCY / 2 +
(random_rand() % (DEFAULT_DAO_LATENCY));
PRINTF("RPL: Scheduling DAO timer Xu ticks in the future");//, (unsigned)expiration_time);
ctimer_set(&dag->dao_timer, expiration_time,
handle_dao_timer, dag);
}
}
void
rpl_schedule_dao(rpl_instance_t *instance)
{
clock_time_t expiration_time;
expiration_time = etimer_expiration_time(&instance->dao_timer.etimer);
if(!etimer_expired(&instance->dao_timer.etimer)) {
PRINTF("RPL: DAO timer already scheduled\n");
} else {
expiration_time = RPL_DAO_LATENCY / 2 +
(random_rand() % (RPL_DAO_LATENCY));
PRINTF("RPL: Scheduling DAO timer %u ticks in the future\n",
(unsigned)expiration_time);
ctimer_set(&instance->dao_timer, expiration_time,
handle_dao_timer, instance);
}
}
PROCESS_THREAD(doorAutoOpeningProcess, ev, data)
{
static struct etimer initialDelay;
static struct etimer blinkingTimer;
static int blinkings;
static clock_time_t remainingDelay;
PROCESS_BEGIN();
printf("Door auto opening: started\n");
remainingDelay = DOOR_AUTO_OPENING_DELAY * CLOCK_SECOND;
while(1)
{
printf("Door auto opening: waiting initial delay\n");
etimer_set(&initialDelay, remainingDelay);
PROCESS_WAIT_EVENT();
if(ev == PROCESS_EVENT_TIMER && etimer_expired(&initialDelay))
break;
else if( ev == alarm_toggled_event)
{
printf("Door auto opening: delay interrupted by alarm\n");
remainingDelay = etimer_expiration_time(&initialDelay) - clock_time();
etimer_stop(&initialDelay);
PROCESS_WAIT_EVENT_UNTIL(ev == alarm_toggled_event);
printf("Door auto opening: alarm stopped, resuming delay\n");
}
}
printf("Door auto opening: door opened\n");
setLock(UNLOCKED);
printf("Door auto opening: blinking started\n");
blinkings = 0;
leds_on(LEDS_BLUE);
while(blinkings < AUTO_OPENING_BLINKINGS - 1)
{
etimer_set(&blinkingTimer, (AUTO_OPENING_LED_PERIOD / 2) * CLOCK_SECOND);
PROCESS_WAIT_EVENT();
if(ev == PROCESS_EVENT_TIMER && etimer_expired(&blinkingTimer))
{
printf("Door auto opening: blinking\n");
leds_toggle(LEDS_BLUE);
etimer_reset(&blinkingTimer);
blinkings++;
}
else if(ev == alarm_toggled_event)
{
printf("Door auto opening: blinking interrupted by alarm\n");
etimer_stop(&blinkingTimer);
PROCESS_WAIT_EVENT_UNTIL(ev == alarm_toggled_event);
printf("Door auto opening: alarm stopped, resuming blinking\n");
}
}
printf("Door auto opening: blinking stopped\n");
printf("Gate auto opening: door locked\n");
setLock(LOCKED);
PROCESS_END();
}
PROCESS_THREAD(proc_epoch_syncer, ev, data) {
static struct etimer send_timer;
static struct etimer epoch_timer;
static const struct broadcast_callbacks broadcast_cbs = {__broadcast_recv_cb, __broadcast_sent_cb};
static struct broadcast_conn conn;
PROCESS_EXITHANDLER(broadcast_close(&conn));
PROCESS_BEGIN();
#ifdef TRACK_CONNECTIONS
/* Log the node id */
printf("board-id64 0x%.16llx\n", board_get_id64());
#endif
#ifdef XFER_CRC16
/* Log the node id */
printf("xfer crc16\n");
#endif
printf("epoch interval %ld ticks\n", EPOCH_INTERVAL);
/*
* Alloc the two syncer events
*/
evt_epoch_synced = process_alloc_event();
evt_end_of_epoch = process_alloc_event();
/*
* Open a `connection` on the syncer broadcasting channel
*/
broadcast_open(&conn, BROADCAST_CHANNEL_TIMESYNC, &broadcast_cbs);
/*
* init the epoch-syncer instance
*/
epoch_syncer_init(&__epoch_syncer);
/*
* This is the main syncer loop. Initially we try to sync the
* epoch between nodes without concurrently running any other
* algo. After a period, at which time the network is synced,
* we start generating epoch events which can be
* consumed by, e.g., the estimator process.
*/
etimer_set(&epoch_timer, __epoch_syncer.epoch_interval);
__epoch_syncer.epoch_start_time = clock_time();
__epoch_syncer.epoch_end_time = etimer_expiration_time(&epoch_timer);
while (1) {
/*
* The start of a new epoch !
*/
epoch_syncer_at_epoch_start(&__epoch_syncer);
clock_time_t now;
clock_time_t time_to_epoch_end;
now = clock_time();
assert(__epoch_syncer.epoch_end_time == etimer_expiration_time(&epoch_timer));
assert(__epoch_syncer.epoch_end_time > now);
time_to_epoch_end = __epoch_syncer.epoch_end_time - now;
/*
* Setup a random wait time before sending the sync packet
*
* ! we cannot let send_timer delay the epoch_timer, especially
* when the next `end-of-epoch-time` has been anticipated by a lot
* (this can happen at startup)
*/
if (time_to_epoch_end > __epoch_syncer.epoch_sync_start) {
long int send_wait;
long int send_wait_rnd;
long int rnd;
rnd = rand();
send_wait_rnd = (unsigned)rnd % (unsigned) __epoch_syncer.epoch_sync_xfer_interval;
send_wait = __epoch_syncer.epoch_sync_start + send_wait_rnd;
assert(send_wait >= __epoch_syncer.epoch_sync_start);
assert(send_wait <= __epoch_syncer.epoch_sync_start + __epoch_syncer.epoch_sync_xfer_interval);
if (send_wait > time_to_epoch_end)
send_wait = __epoch_syncer.epoch_sync_start;
assert(send_wait < time_to_epoch_end);
etimer_set(&send_timer, send_wait);
PROCESS_WAIT_UNTIL(etimer_expired(&send_timer));
/*
* Acquire the radio lock
*
* ! we don't use WAIT/YIELD_UNTIL() because
* 1) we do not want to yield if we can acquire the lock on the first try
* 2) no kernel signal is generated when the lock is released (we would `deadlock')
*/
do {
if (!radio_trylock())
break;
PROCESS_PAUSE();
} while (1);
{
clock_time_t now;
struct epoch_sync_packet packet;
/*
* broadcast the sync packet
*
* ! We put this part into its own block since non static stack
* variables/allocations in the parent block wouldn't get preserved trough
* kernel calls (e.g. the PROCESS_PAUSE() a few lines above)
*/
#ifdef TRACK_CONNECTIONS
packet.board_id16 = board_get_id16();
#endif
packet.epoch = __epoch_syncer.epoch;
now = clock_time();
assert(now > __epoch_syncer.epoch_start_time);
assert(__epoch_syncer.epoch_end_time > now);
packet.time_from_epoch_start = now - __epoch_syncer.epoch_start_time;
packet.time_to_epoch_end = __epoch_syncer.epoch_end_time - now;
#ifdef XFER_CRC16
/*
* Compute the packet crc with the .crc16 field zeroed
*/
{
uint16_t crc16;
packet.crc16 = 0;
crc16 = crc16_data((const unsigned char *)&packet, sizeof(struct epoch_sync_packet), 0);
packet.crc16 = crc16;
}
#endif
packetbuf_copyfrom(&packet, sizeof(struct epoch_sync_packet));
broadcast_send(&conn);
}
} else {
printf("epoch-syncer: skipping sync send\n");
}
/*
* We cannot YIELD here: if epoch_timer has already expired there won't be
* any event to wake us up.
*
* FIXME: if we get here and the epoch timer has fired
* already print by how much we are late: this can be terribly useful
* to trace bugs in the epoch sync code or the kernel.
*/
if (etimer_expired(&epoch_timer)) {
long int now;
now = clock_time();
assert(now > __epoch_syncer.epoch_end_time);
} else {
char do_wait;
do_wait = 1;
if (__epoch_syncer.sum_sync_offsets) {
long int avg_offset = __epoch_syncer.sum_sync_offsets / __epoch_syncer.nr_offsets;
const long int threshold = CLOCK_SECOND;
if (avg_offset > threshold) {
/*
* if we are late don't wait until the timer expires
* ! this migth give us the opportunity to re-enter the right sync_xfer_interval
*/
do_wait = 0;
} else if (avg_offset < -threshold) {
/*
* we are too fast, delay end of epoch
*/
clock_time_t now;
clock_time_t time_to_epoch_end;
now = clock_time();
assert(__epoch_syncer.epoch_end_time == etimer_expiration_time(&epoch_timer));
assert(__epoch_syncer.epoch_end_time > now);
time_to_epoch_end = __epoch_syncer.epoch_end_time - now;
long int delay = time_to_epoch_end + (-avg_offset/2);
static struct etimer delay_timer;
trace("epoch-syncer: delaying end-of-epoch by %ld ticks\n", (-avg_offset/2));
etimer_set(&delay_timer, delay);
__epoch_syncer.epoch_end_time += (-avg_offset/2);
PROCESS_WAIT_UNTIL(etimer_expired(&delay_timer));
}
}
if (do_wait) {
PROCESS_WAIT_UNTIL(etimer_expired(&epoch_timer));
} else {
trace("epoch-syncer: not waiting for end-of-epoch\n");
}
}
trace("epoch-syncer: epoch %d ended\n", __epoch_syncer.epoch);
#ifdef TRACK_CONNECTIONS
connection_print_and_zero(CONNECTION_TRACK_SYNC, __epoch_syncer.epoch);
#endif
/*
* Re-Set the end-of-epoch timer
*/
if (__epoch_syncer.epoch == EPOCHS_UNTIL_SYNCED) {
/*
* We have hopefully achieved sync at this point
*
* 1) update the epoch timings, and set the epoch timer
*
* 2) signal the size-estimator process that the epoch is now synced
*/
__epoch_syncer.epoch_interval = EPOCH_INTERVAL;
__epoch_syncer.epoch_sync_start = EPOCH_SYNC_START;
__epoch_syncer.epoch_sync_xfer_interval = EPOCH_SYNC_XFER_INTERVAL;
etimer_stop(&epoch_timer);
etimer_set(&epoch_timer, __epoch_syncer.epoch_interval);
/*
* The epoch timer has been re-set: update the time until the next epoch end
* Increase the epoch count.
* ! these operations must happen in a block which cannot block in kernel calls
*/
__epoch_syncer.epoch_start_time = clock_time();
__epoch_syncer.epoch_end_time = etimer_expiration_time(&epoch_timer);
__epoch_syncer.epoch++;
process_post(&proc_size_estimator, evt_epoch_synced, NULL);
} else {
/*
* Re-set and adjust the epoch timer using the data received trough sync packets
* (in this epoch)
*
* ! using re-set (instead of, e.g., restart) is important here in order to avoid
* drifting
*/
etimer_reset(&epoch_timer);
/*
* The epoch timer has been re-set: update the time until the next epoch end
* Increase the epoch count.
* ! these operations must happen in a block which cannot block in kernel calls
*/
//__epoch_syncer.epoch_start_time = epoch_timer.timer.start;
__epoch_syncer.epoch_start_time = clock_time();
__epoch_syncer.epoch_end_time = etimer_expiration_time(&epoch_timer);
__epoch_syncer.epoch++;
if (__epoch_syncer.sum_sync_offsets) {
long int avg_offset = __epoch_syncer.sum_sync_offsets / __epoch_syncer.nr_offsets;
const long int threshold = 1;//(CLOCK_SECOND/32);//*3;
#if __CONTIKI_NETSTACK_RDC==__CONTIKI_NETSTACK_RDC_NULL
const int tx_delay = 0;
#elif __CONTIKI_NETSTACK_RDC==__CONTIKI_NETSTACK_RDC_CXMAC
/*
* When the cxmac RDC is used we must consider an added delay due to the fact that when
* other nodes radios are turned off the sync packet must be re-sent.
*/
const int tx_delay = 8;
#endif
/*
* estimate the avg tx delay
*/
avg_offset += tx_delay;
trace("epoch-syncer: sync offsets %d ~ %ld < %ld < %ld\n", __epoch_syncer.nr_offsets, __epoch_syncer.min_offset + tx_delay, avg_offset, __epoch_syncer.max_offset+tx_delay);
if ((avg_offset < -threshold) || (avg_offset > threshold)) {
clock_time_t new_expiration_time;
const long int adjust_threshold = CLOCK_SECOND/2;
long int adjust;
/*
* feedback control the next expiration time
*/
adjust = -avg_offset/2;
adjust = min(adjust, adjust_threshold);
adjust = max(adjust, -adjust_threshold);
if (adjust)
etimer_adjust(&epoch_timer, adjust);
new_expiration_time = etimer_expiration_time(&epoch_timer);
__epoch_syncer.epoch_end_time = new_expiration_time;
}
}
if (__epoch_syncer.epoch > EPOCHS_UNTIL_SYNCED) {
/*
* Signal the estimator-process that this epoch has ended
*/
process_post(&proc_size_estimator, evt_end_of_epoch, NULL);
}
}
}
PROCESS_END();
}
