nRF5 SDK  v13.0.0-1.alpha
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USB CDC HCI protocol
This information applies to the following SoftDevices: S132, S140

The USB CDC HCI protocol implements the Serialization PHY API using the USB interface. The protocol is identical as the UART HCI protocol, except for the HCI SLIP driver, which is using USB CDC class.

USB CDC HCI SLIP driver

The USB CDC HCI SLIP protocol for serialization is implemented in the ser_phy_hci_slip_cdc.c file. It uses the USB CDC ACM class as a low-level driver emulating the serial interface.