On Fri, Jan 20, 2012 at 10:47 AM, Peter Bigot <pabi...@users.sourceforge.net> wrote: > On Thu, Jan 19, 2012 at 7:24 PM, Xiaofan Chen <xiaof...@gmail.com> wrote: >> On Fri, Jan 20, 2012 at 12:02 AM, Peter Bigot >> <pabi...@users.sourceforge.net> wrote: >> Is this libusb-0.1.12-72 the legacy libusb-0.1 version? Or is >> it libusb-compat which is based on libusb-1.0? > > I believe it is legacy; the distribution (openSUSE 10.3) is five years old.
I see. That is a very old distro in the world of Linux. >> Most the Linux distributions (other than Debian/Ubuntu) ship >> with libusb-compat. It seems to me libusb-compat uses the >> location field of the usb_bus structure as the bus number. >> >> http://git.libusb.org/?p=libusb-compat-0.1.git;a=blob;f=libusb/core.c;hb=HEAD;js=1 >> 192 /* iterate over the device list, identifying the individual >> busses. >> 193 * we use the location field of the usb_bus structure to store >> the >> 194 * bus number. */ >> >> Maybe the behavior of the legacy libusb-0.1 is a bit different. I will check in the libusb mailing list to see if this is the case or not. > If so, perhaps we need a way to determine which is being used. If the > script I put in the commit comment actually works when "libusb01" is > being used as a back-end, then there's a conflict; if it doesn't, then > the fix is probably right. I think it is basically not possible to easily differentiate libusb-compat and legacy libusb-0.1 since libusb-compat is supposed to replace libusb-0.1. > Is there a way to influence the selection of back end if multiple ones > are available? I didn't dig into how it was done, but did notice that > libusb01 was listed before libusb1 in at least one place. I believe libusb1 is chosen before libusb01. You can also force to use a certain backend. Reference: http://comments.gmane.org/gmane.comp.python.pyusb.user/276 eg: import usb.core import usb.backend.libusb01 b = usb.backend.libusb01.get_backend() assert b is not None -- Xiaofan ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
