2014-05-21 3:00 GMT-03:00 Slavko Kocjancic <esla...@gmail.com>: > On 05/21/2014 03:36 AM, Wander Lairson Costa wrote: >> 2014-05-20 13:26 GMT-03:00 Slavko Kocjancic <esla...@gmail.com>: >>> Hello... >>> >>> I'm new to python (and pyusb). >>> I try to port some VUSB device to work with python, but get at trouble >>> in beggining. I can't send bytes... >>> here is my example (stripped from manual...) >>> >>> import usb.core >>> import usb.util >>> >>> from array import * >>> dev = usb.core.find(idVendor=0x16c0, idProduct=0x05df) >>> if dev is None: >>> raise ValueError('Device not found') >>> dev.set_configuration() >>> >>> msg = 'test' >>> print dev.ctrl_transfer(32+128, 9, 0, 0, msg) >>> >> I guess the first argument should be just 32. > > Well I want write. And bit 7 of first argument tells if this is write or > read. > and msg (at least by manual) behave as buffer for tx, and integer for > size in receive mode. >
Yes, with this bit set, the request is an IN transfer, and the `msg` parameter is (wrongly) interpreted as the length of the transfer. ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users