topic Re: [LPC55S28]Dual role port for USB in LPC Microcontrollers

[LPC55S28]Dual role port for USB

bryan_hong — Thu, 06 Nov 2025 06:23:41 GMT

dear nxp

When a circuit is added to distinguish between USB device and host modes from a hardware perspective.

on LPC55S28, Is it possible to switch between USB device and host modes at runtime?

Could you provide the example source for this?

Thanks,
Bryan

Re: [LPC55S28]Dual role port for USB

Alice_Yang — Fri, 07 Nov 2025 09:07:51 GMT

Hello @bryan_hong

Thanks for your question.

The LPC55S28 does not support USB dual-role (OTG) function. However, if you use USB0, there is a pin called USB0_IDVALUE. You can develop software to switch between host and device modes at runtime based on the status of this pin.

Alice