On Tue, Mar 15, 2011 at 10:55 PM, Emmanuel Blot <eblot...@gmail.com> wrote: > I need to detach *all* the interfaces from the (Linux) kernel, or I > sometime get an error (not a big deal for my use case) > I also need to call dev.set_configuration() to configure the device. > Nothing unusual I guess. > > The troubles happen when I need to open two serial ports, that is two > interfaces from the same USB device. > On the second initialization call, when dev.set_configuration() is > called for the second time, the first open interface gets in trouble: > Exception: UsbError: No such device (it may have been disconnected) > It seems set_configuration() cannot be called another time if an > interface is already being actively used. > > I don't know how to avoid calling set_configuration() more that once, > as I don't know how to identify that the USB device has already been > configured. >
You can call set_configuration() once and then call claim_interface for each interface. At least this is how libusb works for USB composite device. -- Xiaofan ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
