Bluetooth: Controller: Fix sync_delay and latency in LE BIG Complete (8ebc4f33) · Commits · Wenxi XU / zephyr

subsys/bluetooth/controller/hci/hci.c

+33 −3

Original line number	Diff line number	Diff line
		@@ -8152,8 +8152,11 @@ static void le_big_complete(struct pdu_data *pdu_data,
		struct net_buf *buf)
		{
		struct bt_hci_evt_le_big_complete *sep;
		uint32_t transport_latency_big;
		struct ll_adv_iso_set *adv_iso;
		uint32_t iso_interval_us;
		struct lll_adv_iso *lll;
		uint32_t big_sync_delay;
		size_t evt_size;

		adv_iso = node_rx->rx_ftr.param;
		@@ -8170,9 +8173,36 @@ static void le_big_complete(struct pdu_data *pdu_data,
		return;
		}

		/* FIXME: Fill sync delay and latency */
		sys_put_le24(0, sep->sync_delay);
		sys_put_le24(0, sep->latency);
		/* BT Core v5.4 - Vol 6, Part B, Section 4.4.6.4:
		* BIG_Sync_Delay = (Num_BIS – 1) × BIS_Spacing + (NSE – 1) × Sub_Interval + MPT.
		*
		* BT Core v5.4 - Vol 6, Part G, Section 3.2.1: (Framed)
		* Transport_Latenct_BIG = BIG_Sync_Delay + PTO × (NSE / BN – IRC) * ISO_Interval +
		* ISO_Interval + SDU_Interval
		*
		* BT Core v5.4 - Vol 6, Part G, Section 3.2.2: (Unframed)
		* Transport_Latenct_BIG = BIG_Sync_Delay + (PTO × (NSE / BN – IRC) + 1) * ISO_Interval -
		* SDU_Interval
		*/
		iso_interval_us = lll->iso_interval * ISO_INT_UNIT_US;
		big_sync_delay = ull_iso_big_sync_delay(lll->num_bis, lll->bis_spacing, lll->nse,
		lll->sub_interval, lll->phy, lll->max_pdu,
		lll->enc);
		sys_put_le24(big_sync_delay, sep->sync_delay);

		if (lll->framing) {
		/* Framed */
		transport_latency_big = big_sync_delay +
		lll->pto * (lll->nse / lll->bn - lll->irc) *
		iso_interval_us + iso_interval_us + lll->sdu_interval;
		} else {
		/* Unframed */
		transport_latency_big = big_sync_delay +
		(lll->pto * (lll->nse / lll->bn - lll->irc) + 1) *
		iso_interval_us - lll->sdu_interval;
		}

		sys_put_le24(transport_latency_big, sep->latency);

		sep->phy = find_lsb_set(lll->phy);
		sep->nse = lll->nse;

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