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nimble/ll/css: Fix window offset for 1st connection event

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Depending on timing, connection anchor point calculated for current
period and requested slot might have already passed at the time
advertising PDU is received and this causes window offset to be
calculated incorrectly. In such case we just move connection to next
period and recalculate anchor point again.
This commit is contained in:
Andrzej Kaczmarek
2022-08-05 10:33:27 +02:00
parent 3bb185daad
commit 0f8cfaa4c2
1 changed files with 10 additions and 2 deletions
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nimble/controller/src/ble_ll_sched.c
+10 -2
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@@ -516,9 +516,17 @@ ble_ll_sched_conn_central_new(struct ble_ll_conn_sm *connsm,
max_delay = 0;
}
ble_ll_sched_css_set_conn_anchor(connsm);
/* It's possible that calculated anchor point in current period has
* already passed, so just move to next period and recalculate.
*/
connsm->css_period_idx--;
do {
connsm->css_period_idx++;
ble_ll_sched_css_set_conn_anchor(connsm);
sch->start_time =
connsm->anchor_point - g_ble_ll_sched_offset_ticks;
} while (LL_TMR_LT(sch->start_time, orig_start_time));
sch->start_time = connsm->anchor_point - g_ble_ll_sched_offset_ticks;
sch->end_time = connsm->anchor_point;
sch->remainder = connsm->anchor_point_usecs;