Trace capture USB interface requirements¶

This chapter describes the requirements to enable trace capture via the Zephelin’s USB interface. Zephelin provides an out-of-the box USB device implementation in zpl/backends/usb_backend.c

To enable the USB interface, the user y-should select the CONFIG_ZPL_TRACE_BACKEND_USB Kconfig option. The CONFIG_ZPL_TRACE_BACKEND_USB option automatically selects every necessary software component in Zephyr required to run the USB device stack.

Driver requirements¶

A USB device device driver needs to be provided for the given platform when the USB trace capture interface is used. Make sure there is a UDC driver available for your platform upstream (in drivers/usb/udc/), or provide your own UDC driver implementation as described in the Zephyr documentation.

Devicetree requirements¶

The USB device implemented by Zephelin expects the zephyr_udc0 node to be present in the devicetree file. Make sure the platform devicetree file provides a valid chosen node with the zephyr_udc0 property defined. The property under /chosen/zephyr_udc0 should point to a platform USB controller node.