2011/4/12 Vlad Lopatin <madjesti...@gmail.com>: > Hey guys, > I am coming here from nxt-python mailing list. I am trying to run an > example file from nxt-python which uses pyusb and libusb libraries. The > idea is to send a command to a Lego NXT-brick device, connected through a > USB. I am getting identical errors on Mac, OSX 10.6.7 and Acer Aspire One > (AOA150) running Ubuntu 10.10 netbook remix, so it does not look like a > system-specific error. I ran a few test examples through Komodo IDE in a > debug mode and located the point where program execution breaks. > I am using python 2.6.6(Linux) and 2.7.1(OSX), libusb1.0.8 and pyusb1.0. > I wonder if you can give me some feedback on how I should proceed with > solving the issue. Below is the abbreviated output of an example program > execution with a pyusb in debug mode (export PYUSB_DEBUG_LEVEL=debug) and > later is the debug results: > > vlads-macbook-pro:examples madjestic$ python message_test.py > 2011-04-11 23:22:24,902 INFO:usb.core:find(): using > backend "usb.backend.libusb10" > 2011-04-11 > 23:22:24,902 DEBUG:usb.backend.libusb10:_LibUSB.enumerate_devices() > 2011-04-11 > 23:22:25,491 DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libus > b10._Device object at 0x1007386d0>) > ... > 2011-04-11 > 23:22:28,215 DEBUG:usb.backend.libusb10:_LibUSB.get_configuration_descriptor(<usb.backen > d.libusb10._Device object at 0x100738d50>, 0) > 2011-04-11 > 23:22:28,268 DEBUG:usb.backend.libusb10:_LibUSB.get_interface_descriptor(<usb.backend.li > busb10._Device object at 0x100738d50>, 0, 1, 0) > > 2011-04-11 > 23:22:28,268 DEBUG:usb.backend.libusb10:_LibUSB.get_configuration_descriptor(<usb.backen > d.libusb10._Device object at 0x100738d50>, 0) > found brick! > 2011-04-11 > 23:22:28,320 DEBUG:usb.backend.libusb10:_LibUSB.get_configuration_descriptor(<usb.backen > d.libusb10._Device object at 0x100738990>, 0) > 2011-04-11 > 23:22:28,348 DEBUG:usb.backend.libusb10:_LibUSB.open_device(<usb.backend.libusb10._Device object > at 0x100738990>) > 2011-04-11 > 23:22:28,361 DEBUG:usb.backend.libusb10:_LibUSB.set_configuration(c_void_p(4304333824), 1) > 2011-04-11 > 23:22:28,404 DEBUG:usb.backend.libusb10:_LibUSB.claim_interface(c_void_p(4304333824), 0) > 2011-04-11 > 23:22:28,405 DEBUG:usb.backend.libusb10:_LibUSB.release_interface(c_void_p(4304333824), 0) > 2011-04-11 > 23:22:28,411 DEBUG:usb.backend.libusb10:_LibUSB.reset_device(c_void_p(4304333824)) > 2011-04-11 > 23:22:28,470 DEBUG:usb.backend.libusb10:_LibUSB.close_device(c_void_p(4304333824)) > 2011-04-11 > 23:22:28,473 DEBUG:usb.backend.libusb10:_LibUSB.get_configuration(None) > Segmentation fault > > ########################### > > I get an identical error message, when running the same on Ubuntu > 10.10 Acer Aspire One system, just different numbers in > (c_void_p(XXXXXX)). > > I ran a debugger on a few test scripts and found the point > where it breaks: > it's libusb10.py. line 460: > > @methodtrace(_logger) > def get_configuration(self, dev_handle): > config = c_int() > _check(_lib.libusb_get_configuration(dev_handle, > byref(config))) #Line 460 > return config.value > > The stack at the break point looks like: > config : c_int > value int 0 > dev_handle NoneType None > self _LibUSB <usb.backend.libusb10._LibUSB object at 0x1012c41d0> > > I hope some of this data means something to you. > Feels like a bug in PyUSB... Could you please provide app source code, please?
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