#define EVENT_OVERHEAD_PREEMPT_US     0    /* if <= min, then dynamic preempt */
#define EVENT_OVERHEAD_PREEMPT_MIN_US 0

#if defined(CONFIG_BT_CTLR_XTAL_ADVANCED) && (EVENT_OVERHEAD_PREEMPT_US <= EVENT_OVERHEAD_PREEMPT_MIN_US)
	uint32_t overhead;

	overhead = lll_preempt_calc(ull, (TICKER_ID_CONN_BASE + lll->handle), ticks_at_event);
	/* check if preempt to start has changed */
	if (overhead) {
		LL_ASSERT_OVERHEAD(overhead);

		radio_isr_set(lll_isr_abort, lll);
		radio_disable();

		return -ECANCELED;
	}
#endif /* CONFIG_BT_CTLR_XTAL_ADVANCED */