New experimental USB device support

Overview

The new USB device support is experimental. It consists of USB device controller (UDC) driver API and USB device stack (next) API. The new device stack brings support for multiple device controllers, support for multiple configurations, and dynamic registration of class instances to a configuration at runtime. The stack also provides a specific class API that should be used to implement the functions (classes). It will replace USB device support.

If you would like to play around with the new device support, or the new USB support in general, please try USB support shell sample. The sample is mainly to help test the capabilities of the stack and correct implementation of the USB controller drivers.

Supported USB classes

Bluetooth HCI USB transport layer

See Bluetooth: HCI USB sample for reference. To build the sample for the new device support, set the configuration -DCONF_FILE=usbd_next_prj.conf either directly or via west.

CDC ACM

CDC ACM implementation has support for multiple instances. Description from CDC ACM also applies to the new implementation. See USB CDC ACM Sample Application sample for reference. To build the sample for the new device support, set the configuration -DCONF_FILE=usbd_next_prj.conf either directly or via west.

Mass Storage Class

See USB Mass Storage Sample Application sample for reference. To build the sample for the new device support, set the configuration -DCONF_FILE=usbd_next_prj.conf either directly or via west.

Networking

At the moment only CDC ECM class is implemented and has support for multiple instances. It provides a virtual Ethernet connection between the remote (USB host) and Zephyr network support.

See zperf: Network Traffic Generator for reference. To build the sample for the new device support, set the configuration overlay file -DDEXTRA_CONF_FILE=overlay-usbd_next_ecm.conf and devicetree overlay file -DDTC_OVERLAY_FILE="usbd_next_ecm.overlay either directly or via west.