On Thu, 22 Jul 2004, Kyle Harris wrote:

> I have a USB Tracker. It's not very sophisticated (cheap$), but does show 
> frame data. I can send you a screen grab of the output (didn't buy the export 
> feature), if that would be helpful.  The sequence on Windows is:
> 
> SE0
> GetDescriptor
>    SETUP

The Setup packet had wLength = 64?  Just want to make sure...

>    IN (8 bytes)
>    OUT
> SE0
> SetAddress
>    SETUP
>    IN
> GetDesciptor
>    SETUP
>    IN (8 bytes)
>    IN (8 bytes)
>    IN (2 bytes)
>    OUT
> several GetDescriptor frames follow
> 
> > Is it always the same, or does it differ depending on
> > the speed of the connection?
> 
> How do I control the speed of the connection?

_You_ don't control it, the device does.  Apparently the device you used 
for this test was low-speed; would Windows send the same initial packets 
if the device was full-speed or high-speed?

> > What version of Linux are you using?  
> 
> I'm running 2.4.18-6mdk on my desktop and 2.6.0-rmk2 on a PXA-255 system. I 
> prefer to work on the PXA platform, since that is where it needs to work.
> 
> > I can send you a patch for one of
> > the more recent 2.6 kernels to implement the scheme you described.
> 
> That would be fantastic! Thank you very much!

I'll try to create something for 2.6.0.

Alan Stern



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