Bluetooth: Controller: Add assertion checks for delayed radio start

Add assertion checks for delayed radio start.

Signed-off-by: Vinayak Kariappa Chettimada <[email protected]>

Author: cvinayak

subsys/bluetooth/controller/ll_sw/nordic/lll/lll_scan_aux.c

@@ -338,6 +338,7 @@ void lll_scan_aux_isr_aux_setup(void *param)
 	aux_start_us -= EVENT_JITTER_US;
 
 	start_us = radio_tmr_start_us(0, aux_start_us);
+	LL_ASSERT(start_us == (aux_start_us + 1U));
 
 	/* Setup header complete timeout */
 	hcto = start_us;

subsys/bluetooth/controller/ll_sw/nordic/lll/lll_sync.c

@@ -738,6 +738,7 @@ static void isr_aux_setup(void *param)
 	aux_start_us -= EVENT_JITTER_US;
 
 	start_us = radio_tmr_start_us(0, aux_start_us);
+	LL_ASSERT(start_us == (aux_start_us + 1U));
 
 	/* Setup header complete timeout */
 	hcto = start_us;

subsys/bluetooth/controller/ll_sw/nordic/lll/lll_sync_iso.c

@@ -1046,10 +1046,7 @@ static void isr_rx(void *param)
 
 		start_us = hcto;
 		hcto = radio_tmr_start_us(0U, start_us);
-		/* FIXME: Assertion check disabled until investigation as to
-		 *        why there is high ISR latency causing assertion here.
-		 */
-		/* LL_ASSERT(hcto == (start_us + 1U)); */
+		LL_ASSERT(hcto == (start_us + 1U));
 
 		/* Add 8 us * subevents so far, as radio was setup to listen
 		 * 4 us early and subevents could have a 4 us drift each until