How to make a "reduce down speed of USB interface?"

poplinux · 12-09-2018, 07:30 PM

Hi.

I fail-in something special situation of my developer life.

My boss want to reduce-down speed of usb line.

My boss want to speed Max 50M on usb bus.

But usb 2.0 is to fast, and usb 1.0 is to slow.

So, I want to "usleep" to usb device driver(write and read function).

Please advise to me.

Thank you.

business_kid · 12-10-2018, 06:23 AM

At 50 Megs, will you have time for that? Is there a design reason? usb is like any serial comms, it will slow down if it's getting errors. On a bad line I've been on a few hundred baud with a 56K modem.

If your boss isn't technical, tell him he's an <expletive deleted> and it's done automatically in all dangers, temptations, afflictions, and buffer overloads unless your transmit routine is stupid.

jefro · 12-10-2018, 03:10 PM

I get the feeling that USB 2 specs had more than one speed available. Not sure I've ever heard how to control.

Doubt any sort of sleep will fix this issue and kind of doubt any sort of limit will fix the unknown/unreported issue.