Thanks, Tormod!
Yes, in this case it isn't set (at least, I'm pretty sure that's what the
'~' is). In other cases, the MS software sometimes sets it and sometimes
not, and I was just thinking I want to do whatever it does. In the logs, my
PyUSB-generated commands look just like the MS-generated ones, with the
exception that USBD_SHORT_TRANSFER_OK always appears without the '~'.
>Also, please correct me if I am wrong: Transfer flags are not part of
the USB transactions, do not go across the wire to the device, and are
only used between the application and the lower-level host USB stack.
Hopefully not.
Thanks again,
Craig
On Fri, Nov 16, 2012 at 10:34 AM, Tormod Volden <lists.tor...@gmail.com>wrote:
> On Fri, Nov 16, 2012 at 2:57 AM, Craig Demel wrote:
> > Hi,
> >
> > I'm trying to reproduce some of what Microsoft's Lifecam software does so
> > the camera's exposure settings work better on other platforms. For
> getting
> > USB traces I'm using SniffUSB, which has lines like this:
> >
> > TransferFlags = 00000001 (USBD_TRANSFER_DIRECTION_IN,
> > ~USBD_SHORT_TRANSFER_OK)
> >
> >
> > Right now I'm sending commands like:
> > dev.ctrl_transfer(0xa1, 0x85, 0x1600, 0x500, 2)
> > Which sets the direction just fine, but not the short_transfer_ok flag.
> >
> > Is it possible to do this in PyUSB?
>
> As far as I know, it is not and it is not mentioned in the
> documentation. Only the openbsd backend can use a "flags" attribute in
> some cases, but I don't even know if those are transfer flags. So you
> will have to use libusb directly. Or add support for this in pyusb :)
>
> Anyway, the "~" in the TransferFlags decoding above means that the
> flag is not set, right?
>
> Also, please correct me if I am wrong: Transfer flags are not part of
> the USB transactions, do not go across the wire to the device, and are
> only used between the application and the lower-level host USB stack.
>
> Regards,
> Tormod
>
>
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