Hi,
I got a problem when dealing with control transfer on win7.
After set backend(libusb1), find usb device, I can send standard/class USB
request via dev.ctrl_transfer() successfully, but failed when sending vendor
request.
the reason is 'Entity not found'
Is there any restrictions when sending vendor request?
following is the debug message..
2021-04-27 15:37:18,888 DEBUG:usb.backend.libusb1:_LibUSB.__init__(<WinDLL
'.\libusb-1.0.24\VS2019\MS64\dll\libusb-1.0.dll', handle ef8d0000 at 3576248>)
2021-04-27 15:37:18,894 DEBUG:usb.backend.libusb1:_LibUSB.enumerate_devices()
2021-04-27 15:37:18,976
DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
object at 0x00000000035DFB88>)
2021-04-27 15:37:18,976
DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
object at 0x00000000035DFE08>)
2021-04-27 15:37:18,976
DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
object at 0x00000000035DFB08>)
2021-04-27 15:37:18,976
DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
object at 0x00000000035DFE48>)
-------------------- standard request: get string id=0xEE
2021-04-27 15:37:18,977
DEBUG:usb.backend.libusb1:_LibUSB.open_device(<usb.backend.libusb1._Device
object at 0x00000000035DFE48>)
2021-04-27 15:37:18,980
DEBUG:usb.backend.libusb1:_LibUSB.ctrl_transfer(<usb.backend.libusb1._DeviceHandle
object at 0x00000000035DFD88>, 128, 6, 1006, 1033, array('B', [0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]), 1000)
-------------------- class request: write/read interface 3
2021-04-27 15:37:18,983
DEBUG:usb.backend.libusb1:_LibUSB.claim_interface(<usb.backend.libusb1._DeviceHandle
object at 0x00000000035DFD88>, 3)
2021-04-27 15:37:18,983
DEBUG:usb.backend.libusb1:_LibUSB.ctrl_transfer(<usb.backend.libusb1._DeviceHandle
object at 0x00000000035DFD88>, 33, 9, 513, 3, array('B', [1, 0, 254, 4, 0, 60,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0]), 1000)
2021-04-27 15:37:18,986
DEBUG:usb.backend.libusb1:_LibUSB.ctrl_transfer(<usb.backend.libusb1._DeviceHandle
object at 0x00000000035DFD88>, 161, 1, 257, 3, array('B', [0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0]), 1000)
-------------------- vendor request:
2021-04-27 15:37:18,989
DEBUG:usb.backend.libusb1:_LibUSB.ctrl_transfer(<usb.backend.libusb1._DeviceHandle
object at 0x00000000035DFD88>, 195, 2, 0, 0, array('B', [0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0]), 1000)
Traceback (most recent call last):
File "D:\Python\myusb.py", line 98, in <module>
vendor_reg_read()
File "D:\Python\myusb.py", line 75, in vendor_reg_read
ret = dev.ctrl_transfer(0xc3, 0x02, 0x00, 0, 0x10)
File "D:\Python\walac-pyusb-3ec29ca\usb\core.py", line 1043, in ctrl_transfer
self.__get_timeout(timeout))
File "D:\Python\walac-pyusb-3ec29ca\usb\_debug.py", line 60, in do_trace
return f(*args, **named_args)
File "D:\Python\walac-pyusb-3ec29ca\usb\backend\libusb1.py", line 883, in
ctrl_transfer
timeout))
File "D:\Python\walac-pyusb-3ec29ca\usb\backend\libusb1.py", line 595, in
_check
raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 2] Entity not found
2021-04-27 15:37:19,003
DEBUG:usb.backend.libusb1:_LibUSB.release_interface(<usb.backend.libusb1._DeviceHandle
object at 0x00000000035DFD88>, 3)
2021-04-27 15:37:19,005
DEBUG:usb.backend.libusb1:_LibUSB.close_device(<usb.backend.libusb1._DeviceHandle
object at 0x00000000035DFD88>)
2021-04-27 15:37:19,005 DEBUG:usb.backend.libusb1:_LibUSB._finalize_object()
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