tz_secure_only_usb_fs Directory Reference

Directory dependency graph for tz_secure_only_usb_fs:

Directories
	inc
	src

Detailed Description

USB-FS device-mode CDC ACM echo running entirely in the Secure world: no TrustZone partition and no NSC veneers. The device enumerates as a virtual serial port and echoes every byte sent on bulk-OUT back on bulk-IN. tz_secure_only_usb_hs is the high-speed twin on the other connector.

Both USB cables have to be plugged into the host: J10 for the J-Link OB (flashing and RTT), J11 for the CDC enumeration. VBUS on J11 comes from the on-board USB-PD controller – the host PC does not power that rail.

It is manual because a PC at the far end has to open the port and round-trip a payload. There is a helper for that under scripts/hil/usb/.