Subject: Re: more usb oddness...
To: Alfred Perlstein <>
From: Lennart Augustsson <>
List: tech-kern
Date: 02/26/2002 23:02:39
Alfred Perlstein wrote:

> Ok, I'm stumped.
> It seems like everything works ok (device open/ioctl/etc) the first
> two times I open the device, after that the device starts timeing
> out on requests.
> Any suggestions for debugging this?

Do you have access to a USB protocol analyzer?

There are some weird scanner devices that don't reset the data
toggle when you perform a CLEAR STALL (which open does),
so then you can get out of sync.  That's the only thing I can think


        -- Lennart