topic How to force USB1 peripheral to only use full speed? in LPC Microcontrollers

How to force USB1 peripheral to only use full speed?

cp1 — Fri, 22 May 2020 16:12:34 GMT

I was wondering if there is a way to force the USB1 peripheral in device mode to only use full-speed operation. I understand normally the host signals this, and the USB1 peripheral is capable of using full-speed or high-speed, but is there a way to force it to _only_ use full-speed even when the host is high-speed capable?

I noticed in the host controller peripheral, it has a field for setting the speed of USB1, but it doesn't work when the device controller is used.

I also understand there is a USB0 peripheral that is full-speed only, but is there a way to force the usb1 peripheral to be full-speed only too in device operation?

Re: How to force USB1 peripheral to only use full speed?

cp1 — Mon, 25 May 2020 04:04:49 GMT

Hey Jun

Thanks for the quick reply. Are you sure? It says in the UM that there is "Low-speed (LS), Full-Speed (FS), and High-Speed (HS) support.", in "45.2 Features". So it isn't just highspeed.

Conor

Re: How to force USB1 peripheral to only use full speed?

ZhangJennie — Mon, 25 May 2020 03:43:52 GMT

Hi Conor Patrick

USB1 can only work in high speed. No way to force it work in full speed.

Have a nice day

Jun Zhang

Re: How to force USB1 peripheral to only use full speed?

namsu_mun — Thu, 05 Nov 2020 04:13:07 GMT

Sorry for wrong reply....