Intro and question about High speed Isochronous

[Engineering]

> -----Original Message-----
> From: owner-freebsd-usb at freebsd.org
> >  I started using ugen and got most of the code ported. Then I
> > found out ehci does not support isochronous!
>
> How did you try to use this?

It fails with EIO when I open ugen0.1 - which is the isochronous endpoint.
If I go through a hub to force it to be USB 1.0, it works fine. Looking
throught the ehci source seems to confirm that it just doesn't handles
isochronous, and throws an error

>
> > 	Is there a new USB stack coming with high-speed iso? Will
> it work with
> > ugen? If not ugen, how do I get at it?
>
> My advice would be not to use libusb, just prepare your own kernel
> module. In most cases it is much simpler than ugen. Have a look at
> simple drivers like uscanner to see how to start with the USB
> kernel driver.

Thanks. I will take a look at uscanner, but if it uses ehci I will be in the
same boat.

>
> > 	Is anyone working on a UVC driver? I don't need all the
> features, just to
> > get at the stream data.
>
> You might want to have a look at Luigi Rizzo's work on video:
>
> http://info.iet.unipi.it/~luigi/FreeBSD/usb-cameras.html

Yes, I've been looking at that with a lot of interest. Unfortunately, my
cameras are not supported, and I'm looking to use UVC cameras, as I believe
this will be the standard soon.

Thanks
Sam