I am not so sure why the libusb-0.1 backend can not enumerate the device under Mac OS X Lion. Here libusb-compat-0.1 is used and I built it as universal binary. libusb-1.0 backend works fine.
mymacmini:pyusb xiaofanc$ python Python 2.7.1 (r271:86832, Jul 31 2011, 19:30:53) [GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import usb.core >>> import usb.util >>> dev=usb.core.find(idVendor=0xffff, idProduct=0x0005) 2012-01-21 21:45:02,155 INFO:usb.core:find(): using backend "usb.backend.libusb10" 2012-01-21 21:45:02,155 DEBUG:usb.backend.libusb10:_LibUSB.enumerate_devices() 2012-01-21 21:45:02,688 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device object at 0x10d685690>) 2012-01-21 21:45:02,688 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device object at 0x10d685890>) 2012-01-21 21:45:02,689 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device object at 0x10d6857d0>) 2012-01-21 21:45:02,689 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device object at 0x10d685850>) 2012-01-21 21:45:02,689 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device object at 0x10d685690>) 2012-01-21 21:45:02,689 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device object at 0x10d685890>) 2012-01-21 21:45:02,689 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device object at 0x10d6857d0>) 2012-01-21 21:45:02,689 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device object at 0x10d685850>) 2012-01-21 21:45:02,689 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device object at 0x10d685690>) 2012-01-21 21:45:02,690 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device object at 0x10d685890>) 2012-01-21 21:45:02,690 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device object at 0x10d6857d0>) >>> import usb.backend.libusb01 >>> b=usb.backend.libusb01.get_backend() >>> assert b is not None >>> b <usb.backend.libusb01._LibUSB object at 0x10d6858d0> >>> dev=usb.core.find(idVendor=0xffff, >>> idProduct=0x0005,backend=usb.backend.libusb01.get_backend()) 2012-01-21 21:51:06,927 DEBUG:usb.backend.libusb01:_LibUSB.enumerate_devices() >>> dev >>> assert dev is not None Traceback (most recent call last): File "<stdin>", line 1, in <module> AssertionError -- Xiaofan ------------------------------------------------------------------------------ Try before you buy = See our experts in action! 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-dev2 _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
