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TSCH: add option to not to turn off radio during active TSCH timeslots

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This commit is contained in:
Atis Elsts 2016-04-25 17:40:36 +03:00
parent 723c7e1117
commit 45510f57fa
2 changed files with 125 additions and 34 deletions
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7
core/net/mac/tsch/tsch-conf.h
View File

@ -184,4 +184,11 @@
#define TSCH_HW_FRAME_FILTERING 1
#endif /* TSCH_CONF_HW_FRAME_FILTERING */
/* Keep radio always on within TSCH timeslot (1) or turn it off between packet and ACK? (0) */
#ifdef TSCH_CONF_RADIO_ON_DURING_TIMESLOT
#define TSCH_RADIO_ON_DURING_TIMESLOT TSCH_CONF_RADIO_ON_DURING_TIMESLOT
#else
#define TSCH_RADIO_ON_DURING_TIMESLOT 0
#endif
#endif /* __TSCH_CONF_H__ */

152
core/net/mac/tsch/tsch-slot-operation.c
View File

@ -36,6 +36,7 @@
* \author
* Simon Duquennoy <simonduq@sics.se>
* Beshr Al Nahas <beshr@sics.se>
* Atis Elsts <atis.elsts@bristol.ac.uk>
*
*/
@ -109,6 +110,18 @@
#define RTIMER_GUARD 2u
#endif
enum tsch_radio_state_on_cmd {
TSCH_RADIO_CMD_ON_START_OF_TIMESLOT,
TSCH_RADIO_CMD_ON_WITHIN_TIMESLOT,
TSCH_RADIO_CMD_ON_FORCE,
};
enum tsch_radio_state_off_cmd {
TSCH_RADIO_CMD_OFF_END_OF_TIMESLOT,
TSCH_RADIO_CMD_OFF_WITHIN_TIMESLOT,
TSCH_RADIO_CMD_OFF_FORCE,
};
/* A ringbuf storing outgoing packets after they were dequeued.
* Will be processed layer by tsch_tx_process_pending */
struct ringbufindex dequeued_ringbuf;
@ -370,6 +383,68 @@ update_neighbor_state(struct tsch_neighbor *n, struct tsch_packet *p,
return in_queue;
}
/*---------------------------------------------------------------------------*/
/**
* This function turns on the radio. Its semantics is dependent on
* the value of TSCH_RADIO_ON_DURING_TIMESLOT constant:
* - if enabled, the radio is turned on at the start of the slot
* - if disabled, the radio is turned on within the slot,
* directly before the packet Rx guard time and ACK Rx guard time.
*/
static void
tsch_radio_on(enum tsch_radio_state_on_cmd command)
{
int do_it = 0;
switch(command) {
case TSCH_RADIO_CMD_ON_START_OF_TIMESLOT:
if(TSCH_RADIO_ON_DURING_TIMESLOT) {
do_it = 1;
}
break;
case TSCH_RADIO_CMD_ON_WITHIN_TIMESLOT:
if(!TSCH_RADIO_ON_DURING_TIMESLOT) {
do_it = 1;
}
break;
case TSCH_RADIO_CMD_ON_FORCE:
do_it = 1;
break;
}
if(do_it) {
NETSTACK_RADIO.on();
}
}
/*---------------------------------------------------------------------------*/
/**
* This function turns off the radio. In the same way as for tsch_radio_on(),
* it depends on the value of TSCH_RADIO_ON_DURING_TIMESLOT constant:
* - if enabled, the radio is turned off at the end of the slot
* - if disabled, the radio is turned off within the slot,
* directly after Tx'ing or Rx'ing a packet or Tx'ing an ACK.
*/
static void
tsch_radio_off(enum tsch_radio_state_off_cmd command)
{
int do_it = 0;
switch(command) {
case TSCH_RADIO_CMD_OFF_END_OF_TIMESLOT:
if(TSCH_RADIO_ON_DURING_TIMESLOT) {
do_it = 1;
}
break;
case TSCH_RADIO_CMD_OFF_WITHIN_TIMESLOT:
if(!TSCH_RADIO_ON_DURING_TIMESLOT) {
do_it = 1;
}
break;
case TSCH_RADIO_CMD_OFF_FORCE:
do_it = 1;
break;
}
if(do_it) {
NETSTACK_RADIO.off();
}
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(tsch_tx_slot(struct pt *pt, struct rtimer *t))
{
@ -456,7 +531,7 @@ PT_THREAD(tsch_tx_slot(struct pt *pt, struct rtimer *t))
/* delay before CCA */
TSCH_SCHEDULE_AND_YIELD(pt, t, current_slot_start, TS_CCA_OFFSET, "cca");
TSCH_DEBUG_TX_EVENT();
NETSTACK_RADIO.on();
tsch_radio_on(TSCH_RADIO_CMD_ON_WITHIN_TIMESLOT);
/* CCA */
BUSYWAIT_UNTIL_ABS(!(cca_status |= NETSTACK_RADIO.channel_clear()),
current_slot_start, TS_CCA_OFFSET + TS_CCA);
@ -480,7 +555,7 @@ PT_THREAD(tsch_tx_slot(struct pt *pt, struct rtimer *t))
/* limit tx_time to its max value */
tx_duration = MIN(tx_duration, tsch_timing[tsch_ts_max_tx]);
/* turn tadio off -- will turn on again to wait for ACK if needed */
NETSTACK_RADIO.off();
tsch_radio_off(TSCH_RADIO_CMD_OFF_WITHIN_TIMESLOT);
if(mac_tx_status == RADIO_TX_OK) {
if(!is_broadcast) {
@ -502,7 +577,7 @@ PT_THREAD(tsch_tx_slot(struct pt *pt, struct rtimer *t))
TSCH_SCHEDULE_AND_YIELD(pt, t, current_slot_start,
tsch_timing[tsch_ts_tx_offset] + tx_duration + tsch_timing[tsch_ts_rx_ack_delay] - RADIO_DELAY_BEFORE_RX, "TxBeforeAck");
TSCH_DEBUG_TX_EVENT();
NETSTACK_RADIO.on();
tsch_radio_on(TSCH_RADIO_CMD_ON_WITHIN_TIMESLOT);
/* Wait for ACK to come */
BUSYWAIT_UNTIL_ABS(NETSTACK_RADIO.receiving_packet(),
tx_start_time, tx_duration + tsch_timing[tsch_ts_rx_ack_delay] + tsch_timing[tsch_ts_ack_wait]);
@ -514,7 +589,7 @@ PT_THREAD(tsch_tx_slot(struct pt *pt, struct rtimer *t))
BUSYWAIT_UNTIL_ABS(!NETSTACK_RADIO.receiving_packet(),
ack_start_time, tsch_timing[tsch_ts_max_ack]);
TSCH_DEBUG_TX_EVENT();
NETSTACK_RADIO.off();
tsch_radio_off(TSCH_RADIO_CMD_OFF_WITHIN_TIMESLOT);
#if TSCH_HW_FRAME_FILTERING
/* Leaving promiscuous mode */
@ -588,6 +663,8 @@ PT_THREAD(tsch_tx_slot(struct pt *pt, struct rtimer *t))
}
}
tsch_radio_off(TSCH_RADIO_CMD_OFF_END_OF_TIMESLOT);
current_packet->transmissions++;
current_packet->ret = mac_tx_status;
@ -671,27 +748,26 @@ PT_THREAD(tsch_rx_slot(struct pt *pt, struct rtimer *t))
TSCH_DEBUG_RX_EVENT();
/* Start radio for at least guard time */
NETSTACK_RADIO.on();
packet_seen = NETSTACK_RADIO.receiving_packet();
tsch_radio_on(TSCH_RADIO_CMD_ON_WITHIN_TIMESLOT);
packet_seen = NETSTACK_RADIO.receiving_packet() || NETSTACK_RADIO.pending_packet();
if(!packet_seen) {
/* Check if receiving within guard time */
BUSYWAIT_UNTIL_ABS((packet_seen = NETSTACK_RADIO.receiving_packet()),
current_slot_start, tsch_timing[tsch_ts_rx_offset] + tsch_timing[tsch_ts_rx_wait]);
}
if(packet_seen) {
if(!packet_seen) {
/* no packets on air */
tsch_radio_off(TSCH_RADIO_CMD_OFF_FORCE);
} else {
TSCH_DEBUG_RX_EVENT();
/* Save packet timestamp */
rx_start_time = RTIMER_NOW() - RADIO_DELAY_BEFORE_DETECT;
}
if(!NETSTACK_RADIO.receiving_packet() && !NETSTACK_RADIO.pending_packet()) {
NETSTACK_RADIO.off();
/* no packets on air */
} else {
/* Wait until packet is received, turn radio off */
BUSYWAIT_UNTIL_ABS(!NETSTACK_RADIO.receiving_packet(),
current_slot_start, tsch_timing[tsch_ts_rx_offset] + tsch_timing[tsch_ts_rx_wait] + tsch_timing[tsch_ts_max_tx]);
TSCH_DEBUG_RX_EVENT();
NETSTACK_RADIO.off();
tsch_radio_off(TSCH_RADIO_CMD_OFF_WITHIN_TIMESLOT);
#if TSCH_RESYNC_WITH_SFD_TIMESTAMPS
/* At the end of the reception, get an more accurate estimate of SFD arrival time */
@ -784,7 +860,7 @@ PT_THREAD(tsch_rx_slot(struct pt *pt, struct rtimer *t))
packet_duration + tsch_timing[tsch_ts_tx_ack_delay] - RADIO_DELAY_BEFORE_TX, "RxBeforeAck");
TSCH_DEBUG_RX_EVENT();
NETSTACK_RADIO.transmit(ack_len);
NETSTACK_RADIO.off();
tsch_radio_off(TSCH_RADIO_CMD_OFF_WITHIN_TIMESLOT);
}
/* If the sender is a time source, proceed to clock drift compensation */
@ -820,6 +896,8 @@ PT_THREAD(tsch_rx_slot(struct pt *pt, struct rtimer *t))
process_poll(&tsch_pending_events_process);
}
}
tsch_radio_off(TSCH_RADIO_CMD_OFF_END_OF_TIMESLOT);
}
if(input_queue_drop != 0) {
@ -860,8 +938,12 @@ PT_THREAD(tsch_slot_operation(struct rtimer *t, void *ptr))
} else {
uint8_t current_channel;
int is_active_slot;
TSCH_DEBUG_SLOT_START();
tsch_in_slot_operation = 1;
/* Reset drift correction */
drift_correction = 0;
is_drift_correction_used = 0;
/* Get a packet ready to be sent */
current_packet = get_packet_and_neighbor_for_link(current_link, &current_neighbor);
/* There is no packet to send, and this link does not have Rx flag. Instead of doing
@ -870,26 +952,28 @@ PT_THREAD(tsch_slot_operation(struct rtimer *t, void *ptr))
current_link = backup_link;
current_packet = get_packet_and_neighbor_for_link(current_link, &current_neighbor);
}
/* Hop channel */
current_channel = tsch_calculate_channel(&current_asn, current_link->channel_offset);
NETSTACK_RADIO.set_value(RADIO_PARAM_CHANNEL, current_channel);
/* Reset drift correction */
drift_correction = 0;
is_drift_correction_used = 0;
/* Decide whether it is a TX/RX/IDLE or OFF slot */
/* Actual slot operation */
if(current_packet != NULL) {
/* We have something to transmit, do the following:
* 1. send
* 2. update_backoff_state(current_neighbor)
* 3. post tx callback
**/
static struct pt slot_tx_pt;
PT_SPAWN(&slot_operation_pt, &slot_tx_pt, tsch_tx_slot(&slot_tx_pt, t));
} else if((current_link->link_options & LINK_OPTION_RX)) {
/* Listen */
static struct pt slot_rx_pt;
PT_SPAWN(&slot_operation_pt, &slot_rx_pt, tsch_rx_slot(&slot_rx_pt, t));
is_active_slot = current_packet != NULL || (current_link->link_options & LINK_OPTION_RX);
if(is_active_slot) {
/* Hop channel */
current_channel = tsch_calculate_channel(&current_asn, current_link->channel_offset);
NETSTACK_RADIO.set_value(RADIO_PARAM_CHANNEL, current_channel);
/* Turn the radio on already here if configured so; necessary for radios with slow startup */
tsch_radio_on(TSCH_RADIO_CMD_ON_START_OF_TIMESLOT);
/* Decide whether it is a TX/RX/IDLE or OFF slot */
/* Actual slot operation */
if(current_packet != NULL) {
/* We have something to transmit, do the following:
* 1. send
* 2. update_backoff_state(current_neighbor)
* 3. post tx callback
**/
static struct pt slot_tx_pt;
PT_SPAWN(&slot_operation_pt, &slot_tx_pt, tsch_tx_slot(&slot_tx_pt, t));
} else {
/* Listen */
static struct pt slot_rx_pt;
PT_SPAWN(&slot_operation_pt, &slot_rx_pt, tsch_rx_slot(&slot_rx_pt, t));
}
}
TSCH_DEBUG_SLOT_END();
}