Sorry, I miss the forest for the trees. I'm new to USB programming, python and the pyUSB lib. I think, my problem was, that I was testing with my kindle and I didn't get it so far, that every device has its own vendor requests. Does anyone know, where I get the custom kindle vendor requests? Because I read the device information and the transfer type is "control", so I have to communicate with this protocol.
Thanks in adavance Stefano -------- Original-Nachricht -------- > Datum: Mon, 1 Oct 2012 08:33:11 -0300 > Von: Wander Lairson Costa <wander.lair...@gmail.com> > An: pyusb-users@lists.sourceforge.net > Betreff: Re: [pyusb-users] ctrl_transfer: Example is not working > 2012/10/1 Stefano Di Martino <stefan...@gmx.net>: > > Hi Tormod, > > ok thanks for your reply! > > Can I assume, that the address 0x40 is custom, too? > > > > If I use following code, > > > > assert dev.ctrl_transfer(0x40, usb.util.CTRL_OUT, 0, 0, msg) == len(msg) > > ret = dev.ctrl_transfer(0x40, usb.util.CTRL_IN, 0, 0, len(msg)) > > > > I get the error message: > > "usb.core.USBError: [Errno None] libusb0-dll:err [control_msg] sending > control message failed, win error: A device attached to the system is not > functioning." > > > > I programmed an example that shows me the Endpoints and its directions. > The output is: > > EP 0x81 Direction: IN > > EP 0x1 Direction: OUT > > > > So, if I change the address like this: > > > > assert dev.ctrl_transfer(0x1, usb.util.CTRL_OUT, 0, 0, msg) == len(msg) > > ret = dev.ctrl_transfer(0x81, usb.util.CTRL_IN, 0, 0, len(msg)) > > > > I get following error message: > > "usb.core.USBError: [Errno None] libusb0-dll:err [control_msg] sending > control message failed, win error: The parameter is incorrect." > > > > Do you know what's wrong? > > > > ctrl_transfer only deals with endpoint 0, for endpoints 0x01 and 0x81, > you should use "write" and "read" methods. > > -- > Best Regards, > Wander Lairson Costa > > ------------------------------------------------------------------------------ > Got visibility? > Most devs has no idea what their production app looks like. > Find out how fast your code is with AppDynamics Lite. > http://ad.doubleclick.net/clk;262219671;13503038;y? > http://info.appdynamics.com/FreeJavaPerformanceDownload.html > _______________________________________________ > pyusb-users mailing list > pyusb-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/pyusb-users ------------------------------------------------------------------------------ Got visibility? Most devs has no idea what their production app looks like. Find out how fast your code is with AppDynamics Lite. http://ad.doubleclick.net/clk;262219671;13503038;y? http://info.appdynamics.com/FreeJavaPerformanceDownload.html _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
