topic Re: Add USB Device CDC firmware support in MCUXpresso SDK

Add USB Device CDC firmware support

markpotts123 — Sat, 21 Mar 2026 00:33:27 GMT

I am trying to add USB CDC VCOM device functionality to bare metal firmware running on an LPC55S26-based design. I have updated to the latest MCUXpresso IDE and SDK (with the USB Device middleware included). When I add the USB device to the project via the Peripherals tool and configure pins, clocks, etc I am left with two errors (both the same) and one warning as follows:

Error: "USB device CDC" driver is missing in the project.
Warning: An unsupported version of the USB Common Header in the toolchain/IDE project. Required: 2.8.0, actual: 2.12.1. The project might not compile correctly.

If I try to add the SDK component "USB Device CDC" I get a message that the component was not found in the SDK, however when I look in Available SDK Components it is present. Any suggestions much appreciated.

Re: Add USB Device CDC firmware support

Celeste_Liu — Mon, 23 Mar 2026 11:26:10 GMT

Hello @markpotts123 ,

Thank you for your post. I noticed that you also have a private case on the same topic, and I have already replied to you there. If you have any new updates, please feel free to respond in that case, and I will continue to support you.

Have a nice day.

Celeste

Re: Add USB Device CDC firmware support

markpotts123 — Wed, 25 Mar 2026 14:42:58 GMT

This turned out to be a mismatch between the IDE and SDK versions. Swirching to the latest versions fixed the symptom.