Hello Steven,
Unfortunately I have been so busy at my main job and had no time to
check your problem carefully.
But I can list a few things that maybe wrong:
1) Permissions: does your user have permission to access USB devices.
2) Firmware bug: yes, it occurs more often than you can imagine.
3) libusb 1.0 bug: this error feels like more libusb issue than a PyUSB problem.
4) PyUSB bug: it the above alternatives do not confirm, I think you
have found a bug.
Wander
Wander
2009/11/8 Steven Michalske <smichal...@gmail.com>:
> Howdy,
>
> Under Mac OS X.5 Leopard I get the following error. with latest SVN
> pyUSB and libusb 1.0 driver.
>
>
> Traceback (most recent call last):
> File "USBTMC.py", line 72, in <module>
> tmd = usb.core.find(find_all=1, custom_match=match_usb_tmc(),
> idVendor=0x0699 )
> File "usb/core.py", line 789, in find
> File "usb/core.py", line 762, in device_iter
> File "USBTMC.py", line 9, in __call__
> for cfg in device:
> File "usb/core.py", line 662, in __iter__
> File "usb/core.py", line 360, in __init__
> File
> "/Users/hardkrash/Documents/projects/usbtmc/pyUSB/usb/backend/libusb10.py",
> line 363, in get_configuration_descriptor
> config, byref(cfg)))
> File
> "/Users/hardkrash/Documents/projects/usbtmc/pyUSB/usb/backend/libusb10.py",
> line 300, in _check
> raise USBError(_str_error[retval.value])
> usb.core.USBError: Input/output error
>
>
> and this error case too
>
> Traceback (most recent call last):
> File "USBTMC.py", line 80, in <module>
> tmd.set_configuration()
> File "usb/core.py", line 483, in set_configuration
> File "usb/core.py", line 48, in managed_set_configuration
> File "usb/core.py", line 666, in __getitem__
> File "usb/core.py", line 360, in __init__
> File
> "/Users/hardkrash/Documents/projects/usbtmc/pyUSB/usb/backend/libusb10.py",
> line 363, in get_configuration_descriptor
> config, byref(cfg)))
> File
> "/Users/hardkrash/Documents/projects/usbtmc/pyUSB/usb/backend/libusb10.py",
> line 300, in _check
> raise USBError(_str_error[retval.value])
> usb.core.USBError: Input/output error
>
>
> when trying to use this code. ( simplified from original source. )
>
> <<<<<<<<<< snip >>>>>>>>>
> import usb
>
> class match_usb_tmc(object):
> def __call__(self, device):
> #if device.is_kernel_driver_active(0):
> # return False
> for cfg in device: # fails!
> print( cfg )
> intf = usb.util.find_descriptor( cfg,
> bInterfaceClass=0xFE,
> bInterfaceSubClass=0x03 )
> if intf:
> return True
>
> if __name__ == "__main__":
> from pprint import pprint
> tmd = usb.core.find(find_all=1, custom_match=match_usb_tmc(),
> idVendor=0x0699 ) # ( line 72 )
> #tmd = usb.core.find( idVendor=0x0699 ) # comment out above to
> workaround my issue, and uncomment this to find a single device.
>
> if not tmd:
> raise ValueError('Device not found')
>
> #print tmd.is_kernel_driver_active(0) # uncomment to fix error when
> the device is found.
>
> tmd.set_configuration() # fails if above is commented (line 80)
>
> <<<<<<<<< /snip >>>>>>>>
>
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