Bluetooth: Controller: Calculate Broadcast ISO event overheads
Calculate Broadcast ISO event overheads due to extended and
periodic advertising events.
Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
diff --git a/subsys/bluetooth/controller/ll_sw/ull_adv_iso.c b/subsys/bluetooth/controller/ll_sw/ull_adv_iso.c
index cb53f91..4551fac 100644
--- a/subsys/bluetooth/controller/ll_sw/ull_adv_iso.c
+++ b/subsys/bluetooth/controller/ll_sw/ull_adv_iso.c
@@ -97,13 +97,19 @@
struct ll_adv_iso_set *adv_iso;
struct pdu_adv *pdu_prev, *pdu;
struct pdu_big_info *big_info;
+ uint32_t ticks_slot_overhead;
+ struct ll_adv_sync_set *sync;
+ struct ll_adv_aux_set *aux;
uint32_t event_spacing_max;
uint8_t pdu_big_info_size;
uint32_t iso_interval_us;
uint32_t latency_packing;
+ uint32_t ticks_slot_sync;
+ uint32_t ticks_slot_aux;
memq_link_t *link_cmplt;
memq_link_t *link_term;
struct ll_adv_set *adv;
+ uint32_t slot_overhead;
uint32_t event_spacing;
uint16_t ctrl_spacing;
uint8_t sdu_per_event;
@@ -275,14 +281,48 @@
lll_adv_iso->num_bis;
event_spacing = latency_packing + ctrl_spacing +
EVENT_OVERHEAD_START_US + EVENT_OVERHEAD_END_US;
- /* FIXME: calculate overheads due to extended and periodic advertising.
- */
- event_spacing_max = iso_interval_us - 2000U;
- if (event_spacing > event_spacing_max) {
- /* ISO interval too small to fit the calculated BIG event
- * timing required for the supplied BIG create parameters.
- */
+ /* Calculate overheads due to extended advertising. */
+ aux = HDR_LLL2ULL(adv->lll.aux);
+ ticks_slot_aux = aux->ull.ticks_slot;
+ if (IS_ENABLED(CONFIG_BT_CTLR_LOW_LAT)) {
+ ticks_slot_overhead = MAX(aux->ull.ticks_active_to_start,
+ aux->ull.ticks_prepare_to_start);
+ } else {
+ ticks_slot_overhead = 0U;
+ }
+ ticks_slot_aux += ticks_slot_overhead;
+
+ /* Calculate overheads due to periodic advertising. */
+ sync = HDR_LLL2ULL(lll_adv_sync);
+ ticks_slot_sync = sync->ull.ticks_slot;
+ if (IS_ENABLED(CONFIG_BT_CTLR_LOW_LAT)) {
+ ticks_slot_overhead = MAX(sync->ull.ticks_active_to_start,
+ sync->ull.ticks_prepare_to_start);
+ } else {
+ ticks_slot_overhead = 0U;
+ }
+ ticks_slot_sync += ticks_slot_overhead;
+
+ /* Calculate total overheads due to extended and periodic advertising */
+ if (CONFIG_BT_CTLR_ADV_AUX_SYNC_OFFSET > 0U) {
+ ticks_slot_overhead = MAX(ticks_slot_aux, ticks_slot_sync);
+ } else {
+ ticks_slot_overhead = ticks_slot_aux + ticks_slot_sync;
+ }
+
+ /* Calculate max available ISO event spacing */
+ slot_overhead = HAL_TICKER_TICKS_TO_US(ticks_slot_overhead);
+ if (slot_overhead < iso_interval_us) {
+ event_spacing_max = iso_interval_us - slot_overhead;
+ } else {
+ event_spacing_max = 0U;
+ }
+
+ /* Check if ISO interval too small to fit the calculated BIG event
+ * timing required for the supplied BIG create parameters.
+ */
+ if (event_spacing > event_spacing_max) {
/* Release allocated link buffers */
ll_rx_link_release(link_cmplt);
ll_rx_link_release(link_term);
