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
