Hello list,
I'm trying to communicate with the USB-2001-TC from MC
(http://www.mccdaq.com/usb-data-acquisition/usb-2001-tc.aspx) using
their text based protocol.
I'm using pyusb 1.0.0 a1 and figured out this script:
import usb.core
import usb.util
def first_try():
# find our device
dev = usb.core.find(idVendor = 0x09db, idProduct = 0x00f9)
# was it found?
if dev is None:
raise ValueError('Device not found')
# set the active configuration. With no arguments, the first
# configuration will be the active one
dev.set_configuration()
# get an endpoint instance
cfg = dev.get_active_configuration()
for i in cfg:
print i.bInterfaceNumber
interface_number = i.bInterfaceNumber
alternate_settting = usb.control.get_interface(dev, interface_number)
intf = usb.util.find_descriptor(cfg, bInterfaceNumber =
interface_number, bAlternateSetting = alternate_settting)
ep = usb.util.find_descriptor(
intf,
# match the first OUT endpoint
custom_match = \
lambda e: \
usb.util.endpoint_direction(e.bEndpointAddress) == \
usb.util.ENDPOINT_OUT
)
assert ep is not None
# write the data
#ep.write('test')
if __name__ == "__main__":
first_try()
I get a assert exception (ep is none). As I have currently no knowledge
about the USB related parameters of the Device and I'm no USB expert I
don't know what's the problem.
So any help is very welcome.
Regards
Alexander
As I enabled pyusb loggin I get the following output:
====================================================
2011-10-06 03:23:44,906 INFO:usb.core:find(): using backend
"usb.backend.libusb10"
2011-10-06 03:23:44,910
DEBUG:usb.backend.libusb10:_LibUSB.enumerate_devices()
2011-10-06 03:23:44,913
DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device
object at 0x983f8cc>)
2011-10-06 03:23:44,913
DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device
object at 0x983f96c>)
2011-10-06 03:23:44,913
DEBUG:usb.backend.libusb10:_LibUSB.get_device_descriptor(<usb.backend.libusb10._Device
object at 0x983f90c>)
2011-10-06 03:23:44,913
DEBUG:usb.backend.libusb10:_LibUSB.get_configuration_descriptor(<usb.backend.libusb10._Device
object at 0x983f90c>, 0)
2011-10-06 03:23:44,914
DEBUG:usb.backend.libusb10:_LibUSB.open_device(<usb.backend.libusb10._Device
object at 0x983f90c>)
2011-10-06 03:23:44,914
DEBUG:usb.backend.libusb10:_LibUSB.set_configuration(c_void_p(159873736), 1)
2011-10-06 03:23:44,939
DEBUG:usb.backend.libusb10:_LibUSB.get_configuration_descriptor(<usb.backend.libusb10._Device
object at 0x983f90c>, 0)
2011-10-06 03:23:44,940
DEBUG:usb.backend.libusb10:_LibUSB.get_interface_descriptor(<usb.backend.libusb10._Device
object at 0x983f90c>, 0, 0, 0)
2011-10-06 03:23:44,940
DEBUG:usb.backend.libusb10:_LibUSB.get_configuration_descriptor(<usb.backend.libusb10._Device
object at 0x983f90c>, 0)
2011-10-06 03:23:44,940
DEBUG:usb.backend.libusb10:_LibUSB.get_interface_descriptor(<usb.backend.libusb10._Device
object at 0x983f90c>, 0, 1, 0)
2011-10-06 03:23:44,940
DEBUG:usb.backend.libusb10:_LibUSB.get_configuration_descriptor(<usb.backend.libusb10._Device
object at 0x983f90c>, 0)
2011-10-06 03:23:44,940
DEBUG:usb.backend.libusb10:_LibUSB.ctrl_transfer(c_void_p(159873736),
129, 10, 0, 0, 1, 1000)
--> Interface number is: 0
2011-10-06 03:23:44,942
DEBUG:usb.backend.libusb10:_LibUSB.get_interface_descriptor(<usb.backend.libusb10._Device
object at 0x983f90c>, 0, 0, 0)
2011-10-06 03:23:44,943
DEBUG:usb.backend.libusb10:_LibUSB.get_configuration_descriptor(<usb.backend.libusb10._Device
object at 0x983f90c>, 0)
Traceback (most recent call last):
File "/home/pyseminar/workspace/devel_pyusb/src/test_temp_device.py",
line 44, in <module>
first_try()
File "/home/pyseminar/workspace/devel_pyusb/src/test_temp_device.py",
line 37, in first_try
assert ep is not None
AssertionError
2011-10-06 03:23:44,947
DEBUG:usb.backend.libusb10:_LibUSB.close_device(c_void_p(159873736))
------------------------------------------------------------------------------
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