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nimble/ll: Add option to extend T_MAFS

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By default we try to schedule any AUX/SYNC/CHAIN within T_MAFS to make
extended/periodic advertising events as short as possible. However, on
slower MCUs like Cortex-M0 300us (T_MAFS) may be too short to schedule
and start TX of subsequent PDU and we may drop some packets. This patch
adds an option to extend these times in scheduler.

Note that it is strongly recommended to keep these new settings at
default values unless you know what you are doing!
This commit is contained in:
Andrzej Kaczmarek
2019-11-05 13:49:09 +01:00
parent 5afa6ef897
commit ffc76ac0e9
2 changed files with 17 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
nimble/controller/src/ble_ll_adv.c
+3 -3
View File
@@ -1411,7 +1411,7 @@ ble_ll_adv_aux_schedule_next(struct ble_ll_adv_sm *advsm)
max_usecs = ble_ll_pdu_tx_time_get(aux_next->payload_len, advsm->sec_phy);
aux_next->start_time = aux->sch.end_time +
ble_ll_usecs_to_ticks_round_up(BLE_LL_MAFS);
ble_ll_usecs_to_ticks_round_up(BLE_LL_MAFS + MYNEWT_VAL(BLE_LL_SCHED_AUX_CHAIN_MAFS_DELAY));
sch = &aux_next->sch;
sch->start_time = aux_next->start_time - g_ble_ll_sched_offset_ticks;
@@ -1530,7 +1530,7 @@ ble_ll_adv_aux_set_start_time(struct ble_ll_adv_sm *advsm)
adv_event_dur = (adv_pdu_dur * chans) + (9 * (chans - 1));
advsm->aux[0].start_time = advsm->adv_event_start_time + adv_event_dur +
ble_ll_usecs_to_ticks_round_up(BLE_LL_MAFS);
ble_ll_usecs_to_ticks_round_up(BLE_LL_MAFS + MYNEWT_VAL(BLE_LL_SCHED_AUX_MAFS_DELAY));
}
static void
@@ -2267,7 +2267,7 @@ ble_ll_adv_periodic_schedule_next(struct ble_ll_adv_sm *advsm)
max_usecs = ble_ll_pdu_tx_time_get(sync_next->payload_len, advsm->sec_phy);
sync_next->start_time = sync->sch.end_time +
ble_ll_usecs_to_ticks_round_up(BLE_LL_MAFS);
ble_ll_usecs_to_ticks_round_up(BLE_LL_MAFS + MYNEWT_VAL(BLE_LL_SCHED_AUX_CHAIN_MAFS_DELAY));
sch = &sync_next->sch;
sch->start_time = sync_next->start_time - g_ble_ll_sched_offset_ticks;
nimble/controller/syscfg.yml
+14
View File
@@ -340,6 +340,20 @@ syscfg.defs:
was sent from controller.
value: -1
# Below settings allow to change scheduler timings. These should be left at
# default values unless you know what you are doing!
BLE_LL_SCHED_AUX_MAFS_DELAY:
description: >
Additional delay [us] between last ADV_EXT_IND and AUX_ADV_IND PDUs
when scheduling extended advertising event. This extends T_MAFS.
value: 0
BLE_LL_SCHED_AUX_CHAIN_MAFS_DELAY:
description: >
Additional delay [us] between consecutive AUX_CHAIN_IND PDUs
when scheduling extended or periodic advertising event. This extends
T_MAFS.
value: 0
# deprecated settings (to be defunct/removed eventually)
BLE_LL_DIRECT_TEST_MODE:
description: use BLE_LL_DTM instead