How does BLE's central and peripheral synchronize the frequency hopping frequency

[mfinmuch]

Currently I use nrf52840 for BLE research
I know that in bluetooth/controller/ll_sw/nordic/lll/lll_master.c, in prepare_cb, data_chan_use is setting the frequency channel to be used next
data_chan_use = lll_chan_sel_2(event_counter, lll->data_chan_id, &lll->data_chan_map[0], lll->data_chan_count);
But how does central inform the frequency sequence to the peripheral to jump?
Can't find a place for the synchronization frequency hopping sequence
Please tell me if you know
thank

[carlescufi]

@cvinayak can probably answer that

[mfinmuch]

@carlescufi thanks,
How can i contact him?

[carlescufi]

He's around in Zephyr's Slack, with the same handle.