Intro and question about High speed Isochronous

Hi all, this is Sam Zehr.

	I am an embedded systems programmer working on porting an
app to FreeBSD.
I'm afraid I'm no expert in BSD, or any *nix stuff, but I'm
plugging along.

	My project requires high-speed isochronous transfer. At
first, I thought,
no problem. I got it working in Windows with a generic USB
driver, so BSD
should be easy! I started using ugen and got most of the
code ported. Then I
found out ehci does not support isochronous!

	Looking through archives, and googling, I see that work is
being done to
fix this (and it would appear that this is the right list,
as I see the same
names as some of the websites I've been to)

	Basically, I'm trying to implement a limited subset of UVC.
I'm open to
doing this whichever way will work. So, my questions are:

	Is there a fix coming for ehci so iso will work?

	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?

	Is anyone working on a UVC driver? I don't need all the
features, just to
get at the stream data.

	I apologize if the answers are common knowledge, but I
couldn't find
anything definative in my googling.

	Thanks
	Sam




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Engineering wrote:


>  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?

> 	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.

> 	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


--Marcin