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 ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
