How get the BLE RF center frequency in Zephyr

[upupsky]

1. in the file "Core_v5.2.pdf"
   "The LE system operates in the 2.4 GHz ISM band at 2400-2483.5 MHz. The
   LE system uses 40 RF channels. These RF channels have center frequencies
   2402 + k * 2 MHz, where k = 0, ..., 39."

2. in the file "hci.c" line 5190, in zephyr
   sec_phy_curr = aux_ptr->phy + 1; aux_phy = BIT(aux_ptr->phy); BT_DBG(" AuxPtr chan_idx = %u, ca = %u, offs_units " "= %u offs = 0x%x, phy = 0x%x", aux_ptr->chan_idx, aux_ptr->ca, aux_ptr->offs_units, aux_ptr->offs, aux_phy);

Question: How can I get the 'AuxPtr chan_idx', in period adv? It seems not in "struct bt_le_scan_recv_info *info",not in"struct bt_le_per_adv_sync_recv_info *info",not in "struct bt_le_per_adv_sync *sync".

thks.