Bluetooth: controller: LLL: Add peek extra_data related with lll_adv_sync

Configuration of CTE for transmission is stored in extra_date member
of a lll_adv_sync object. PDUs in periodic advertising chain share the
same CTE configuration, so there is single instance of the extra_data.
To configure CTE transmission for every PDU in periodic advertising
chain a new function was introduced to peek extra_data instance without
peeking new PDU.

Signed-off-by: Piotr Pryga <[email protected]>

Author: ppryga-nordic

subsys/bluetooth/controller/ll_sw/nordic/lll/lll_adv_pdu.h

@@ -138,6 +138,13 @@ static inline struct pdu_adv *lll_adv_sync_data_peek(struct lll_adv_sync *lll,
 
 	return (void *)lll->data.pdu[last];
 }
+
+#if defined(CONFIG_BT_CTLR_ADV_EXT_PDU_EXTRA_DATA_MEMORY)
+static inline void *lll_adv_sync_extra_data_peek(struct lll_adv_sync *lll)
+{
+	return lll->data.extra_data[lll->data.last];
+}
+#endif /* CONFIG_BT_CTLR_ADV_EXT_PDU_EXTRA_DATA_MEMORY */
 #endif /* CONFIG_BT_CTLR_ADV_PERIODIC */
 #endif /* CONFIG_BT_CTLR_ADV_EXT */