Thank you very much and my best regards Michel Allaire
-----Message d'origine----- De : Xiaofan Chen [mailto:xiaof...@gmail.com] Envoyé : 2 mars 2015 20:20 À : pyusb-users@lists.sourceforge.net Objet : Re: [pyusb-users] No backend available with windows 7 On Tue, Mar 3, 2015 at 2:40 AM, Michel Allaire <michel....@videotron.ca> wrote: > But it seems that I can't access the list devices on the bus with the > following script: > > import usb.core > import usb.util > > list_dev = usb.core.find(find_all=True) n = 0 for dev in list_dev: > n = n+1 > print (n, " " , dev) > > > Could it be because I did not specified any filter or .INF file since > I want to scan the bus myself to connect to microcontrollers in a > arbitrary number and USB ready Yes. If you use libusb-win32 under Windows, you have to have one supported device with libusb0.sys driver. If you use libusb-1.0 backend (libusb Windows backend), then you do not need to have a device with a supported driver (eg WinUSB) to find the device, but then you need to have such a device if you want to do more than that (read/write endpoint, etc). > Will this behavior also exists on my target operating system with will > be Linux running on à Raspberry PI. No. Linux is different since libusb uses usbfs under Linux (you do need to detach non-usbfs driver first). -- Xiaofan ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
