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add tsch_get_network_uptime_ticks() function

This commit is contained in:
Atis Elsts 2018-12-18 16:21:15 +00:00
parent 9c086d40b1
commit f9cd3449f3
3 changed files with 51 additions and 5 deletions
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48
os/net/mac/tsch/tsch-slot-operation.c
View File

@ -52,6 +52,7 @@
#include "net/queuebuf.h"
#include "net/mac/framer/framer-802154.h"
#include "net/mac/tsch/tsch.h"
#include "sys/critical.h"
#include "sys/log.h"
/* TSCH debug macros, i.e. to set LEDs or GPIOs on various TSCH
@ -126,9 +127,10 @@ struct tsch_packet *dequeued_array[TSCH_DEQUEUED_ARRAY_SIZE];
struct ringbufindex input_ringbuf;
struct input_packet input_array[TSCH_MAX_INCOMING_PACKETS];
/* Updates and reads of the next two variables must be atomic (i.e. both together) */
/* Last time we received Sync-IE (ACK or data packet from a time source) */
static struct tsch_asn_t last_sync_asn;
clock_time_t last_sync_time; /* Same info, in clock_time_t units */
clock_time_t tsch_last_sync_time; /* Same info, in clock_time_t units */
/* A global lock for manipulating data structures safely from outside of interrupt */
static volatile int tsch_locked = 0;
@ -347,6 +349,33 @@ get_packet_and_neighbor_for_link(struct tsch_link *link, struct tsch_neighbor **
return p;
}
/*---------------------------------------------------------------------------*/
uint64_t
tsch_get_network_uptime_ticks(void)
{
uint64_t uptime_asn;
uint64_t uptime_ticks;
int_master_status_t status;
if(!tsch_is_associated) {
/* not associated, network uptime is not known */
return (uint64_t)-1;
}
status = critical_enter();
uptime_asn = last_sync_asn.ls4b + ((uint64_t)last_sync_asn.ms1b << 32);
/* first calculate the at the uptime at the last sync in rtimer ticks */
uptime_ticks = uptime_asn * tsch_timing[tsch_ts_timeslot_length];
/* then convert to clock ticks (assume that CLOCK_SECOND divides RTIMER_ARCH_SECOND) */
uptime_ticks /= (RTIMER_ARCH_SECOND / CLOCK_SECOND);
/* then add the ticks passed since the last timesync */
uptime_ticks += (clock_time() - tsch_last_sync_time);
critical_exit(status);
return uptime_ticks;
}
/*---------------------------------------------------------------------------*/
/**
* This function turns on the radio. Its semantics is dependent on
* the value of TSCH_RADIO_ON_DURING_TIMESLOT constant:
@ -623,7 +652,7 @@ PT_THREAD(tsch_tx_slot(struct pt *pt, struct rtimer *t))
tsch_timesync_update(current_neighbor, since_last_timesync, drift_correction);
/* Keep track of sync time */
last_sync_asn = tsch_current_asn;
last_sync_time = clock_time();
tsch_last_sync_time = clock_time();
tsch_schedule_keepalive();
}
mac_tx_status = MAC_TX_OK;
@ -882,7 +911,7 @@ PT_THREAD(tsch_rx_slot(struct pt *pt, struct rtimer *t))
int32_t since_last_timesync = TSCH_ASN_DIFF(tsch_current_asn, last_sync_asn);
/* Keep track of last sync time */
last_sync_asn = tsch_current_asn;
last_sync_time = clock_time();
tsch_last_sync_time = clock_time();
/* Save estimated drift */
drift_correction = -estimated_drift;
is_drift_correction_used = 1;
@ -1014,6 +1043,13 @@ PT_THREAD(tsch_slot_operation(struct rtimer *t, void *ptr))
/* End of slot operation, schedule next slot or resynchronize */
if(tsch_is_coordinator) {
/* Update the `last_sync_*` variables to avoid large errors
* in the application-level time synchronization */
last_sync_asn = tsch_current_asn;
tsch_last_sync_time = clock_time();
}
/* Do we need to resynchronize? i.e., wait for EB again */
if(!tsch_is_coordinator && (TSCH_ASN_DIFF(tsch_current_asn, last_sync_asn) >
(100 * TSCH_CLOCK_TO_SLOTS(TSCH_DESYNC_THRESHOLD / 100, tsch_timing[tsch_ts_timeslot_length])))) {
@ -1115,10 +1151,14 @@ void
tsch_slot_operation_sync(rtimer_clock_t next_slot_start,
struct tsch_asn_t *next_slot_asn)
{
int_master_status_t status;
current_slot_start = next_slot_start;
tsch_current_asn = *next_slot_asn;
status = critical_enter();
last_sync_asn = tsch_current_asn;
last_sync_time = clock_time();
tsch_last_sync_time = clock_time();
critical_exit(status);
current_link = NULL;
}
/*---------------------------------------------------------------------------*/

2
os/net/mac/tsch/tsch-slot-operation.h
View File

@ -56,7 +56,7 @@ extern struct tsch_packet *dequeued_array[TSCH_DEQUEUED_ARRAY_SIZE];
extern struct ringbufindex input_ringbuf;
extern struct input_packet input_array[TSCH_MAX_INCOMING_PACKETS];
/* Last clock_time_t where synchronization happened */
extern clock_time_t last_sync_time;
extern clock_time_t tsch_last_sync_time;
/* Counts the length of the current burst */
extern int tsch_current_burst_count;

6
os/net/mac/tsch/tsch.h
View File

@ -226,6 +226,12 @@ void tsch_schedule_keepalive(void);
* Schedule a keep-alive immediately
*/
void tsch_schedule_keepalive_immediately(void);
/**
* Get the time, in clock ticks, since the TSCH network was started.
*
* \return The network uptime, or -1 if the node is not part of a TSCH network.
*/
uint64_t tsch_get_network_uptime_ticks(void);
/**
* Leave the TSCH network we are currently in
*/