2014-07-13 7:47 GMT-03:00 Petr Škramovský <petr.skramov...@gmail.com>:
> Hello, I'm kinda stuck. If I use libusb0 back-end first device works just
> fine but second one uses isochronous transfer which is not implemented in
> libusb0 back-end.
AFAIK, libusb 1.0 does not implement isochronous transfer on Windows.
If you want to confirm that, you should ping libusb mailing list.
> If I switch to libusb1 back-end I'm getting strange errors even with first
> device:
>
> 2014-07-13 12:23:38,073 DEBUG:usb.backend.libusb1:_LibUSB.__init__(<WinDLL
> 'C:\Windows\system32\libusb-1.0.dll', handle 721f0000 at 2a09390>)
> 2014-07-13 12:23:38,076
> DEBUG:usb.backend.libusb1:_LibUSB.enumerate_devices()
> 2014-07-13 12:23:38,329
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x02A1EFD0>)
> 2014-07-13 12:23:38,331
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x02A55070>)
> 2014-07-13 12:23:38,331
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x02A1EFD0>)
> 2014-07-13 12:23:38,332
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x02A55090>)
> 2014-07-13 12:23:38,332
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x02A1EFD0>)
> 2014-07-13 12:23:38,334
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x02A55070>)
> 2014-07-13 12:23:38,334
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x02A1EFD0>)
> 2014-07-13 12:23:38,335
> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
> object at 0x02A55090>)
> 2014-07-13 12:23:38,335
> DEBUG:usb.backend.libusb1:_LibUSB.open_device(<usb.backend.libusb1._Device
> object at 0x02A55090>)
> 2014-07-13 12:23:38,336
> DEBUG:usb.backend.libusb1:_LibUSB.ctrl_transfer(<usb.backend.libusb1._DeviceHandle
> object at 0x02A1EEF0>, 128, 6, 768, 0, 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, 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)
> 2014-07-13 12:23:38,338
> DEBUG:usb.backend.libusb1:_LibUSB.ctrl_transfer(<usb.backend.libusb1._DeviceHandle
> object at 0x02A1EEF0>, 128, 6, 768, 0, 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, 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)
> 2014-07-13 12:23:38,339
> DEBUG:usb.backend.libusb1:_LibUSB.get_configuration_descriptor(<usb.backend.libusb1._Device
> object at 0x02A55090>, 0)
> 2014-07-13 12:23:38,341
> DEBUG:usb.backend.libusb1:_LibUSB.get_interface_descriptor(<usb.backend.libusb1._Device
> object at 0x02A55090>, 0, 0, 0)
> 2014-07-13 12:23:38,342
> DEBUG:usb.backend.libusb1:_LibUSB.get_configuration_descriptor(<usb.backend.libusb1._Device
> object at 0x02A55090>, 0)
> 2014-07-13 12:23:38,342
> DEBUG:usb.backend.libusb1:_LibUSB.get_interface_descriptor(<usb.backend.libusb1._Device
> object at 0x02A55090>, 0, 1, 0)
> 2014-07-13 12:23:38,342
> DEBUG:usb.backend.libusb1:_LibUSB.get_configuration_descriptor(<usb.backend.libusb1._Device
> object at 0x02A55090>, 0)
> 2014-07-13 12:23:38,344
> DEBUG:usb.backend.libusb1:_LibUSB.get_configuration_descriptor(<usb.backend.libusb1._Device
> object at 0x02A55090>, 0)
> 2014-07-13 12:23:38,344
> DEBUG:usb.backend.libusb1:_LibUSB.set_configuration(<usb.backend.libusb1._DeviceHandle
> object at 0x02A1EEF0>, 1)
> Traceback (most recent call last):
> ...
> File "C:\Python27\lib\site-packages\usb\core.py", line 799, in
> set_configuration
> self._ctx.managed_set_configuration(self, configuration)
> File "C:\Python27\lib\site-packages\usb\core.py", line 128, in
> managed_set_configuration
> self.backend.set_configuration(self.handle, cfg.bConfigurationValue)
> File "C:\Python27\lib\site-packages\usb\_debug.py", line 60, in do_trace
> return f(*args, **named_args)
> File "C:\Python27\lib\site-packages\usb\backend\libusb1.py", line 730, in
> set_configuration
> _check(self.lib.libusb_set_configuration(dev_handle.handle,
> config_value))
> File "C:\Python27\lib\site-packages\usb\backend\libusb1.py", line 552, in
> _check
> raise USBError(_strerror(ret), ret, _libusb_errno[ret])
> usb.core.USBError: [Errno 2] Entity not found
> 2014-07-13 12:23:38,371
> DEBUG:usb.backend.libusb1:_LibUSB.close_device(<usb.backend.libusb1._DeviceHandle
> object at 0x02A1EEF0>)
> 2014-07-13 12:23:38,371 DEBUG:usb.backend.libusb1:_LibUSB.__del__()
>
This is rather strange, which PyUSB version are you using, git HEAD?
Could you please post your source code?
> I even tried to implement missing iso_read method for libusb0 because
> apparently windows version does support it.
> Unfortunately I had no luck usb_submit_async returns -22 and I have no idea
> why.
>
> @methodtrace(_logger)
> def iso_read(self, dev_handle, ep, intf, buff, timeout):
> ctx = c_void_p(0)
> _lib.usb_isochronous_setup_async(dev_handle, byref(ctx), ep, 1024)
> address, length = buff.buffer_info()
> length *= buff.itemsize
> _lib.usb_submit_async(byref(ctx), cast(address, c_char_p), length)
> _lib.usb_reap_async(ctx, timeout)
> ...
>
If you want to go ahead with this implementation, maybe first you
should write a little C program that does iso transfers, to get used
to the API and them switch to the Python implementation. This also
makes things easier to get support from libusb-win32 guys.
> device descs :
>
> DEVICE ID 045e:02b0 on Bus 000 Address 001 =================
> bLength : 0x12 (18 bytes)
> bDescriptorType : 0x1 Device
> bcdUSB : 0x200 USB 2.0
> bDeviceClass : 0x0 Specified at interface
> bDeviceSubClass : 0x0
> bDeviceProtocol : 0x0
> bMaxPacketSize0 : 0x40 (64 bytes)
> idVendor : 0x045e
> idProduct : 0x02b0
> bcdDevice : 0x105 Device 1.05
> iManufacturer : 0x1 Microsoft
> iProduct : 0x2 Xbox NUI Motor
> iSerialNumber : 0x0
> bNumConfigurations : 0x1
> CONFIGURATION 1: 100 mA ==================================
> bLength : 0x9 (9 bytes)
> bDescriptorType : 0x2 Configuration
> wTotalLength : 0x12 (18 bytes)
> bNumInterfaces : 0x1
> bConfigurationValue : 0x1
> iConfiguration : 0x0
> bmAttributes : 0xc0 Self Powered
> bMaxPower : 0x32 (100 mA)
> INTERFACE 0: Vendor Specific ===========================
> bLength : 0x9 (9 bytes)
> bDescriptorType : 0x4 Interface
> bInterfaceNumber : 0x0
> bAlternateSetting : 0x0
> bNumEndpoints : 0x0
> bInterfaceClass : 0xff Vendor Specific
> bInterfaceSubClass : 0x0
> bInterfaceProtocol : 0x0
> iInterface : 0x0
>
> DEVICE ID 045e:02ae on Bus 000 Address 003 =================
> bLength : 0x12 (18 bytes)
> bDescriptorType : 0x1 Device
> bcdUSB : 0x200 USB 2.0
> bDeviceClass : 0x0 Specified at interface
> bDeviceSubClass : 0x0
> bDeviceProtocol : 0x0
> bMaxPacketSize0 : 0x40 (64 bytes)
> idVendor : 0x045e
> idProduct : 0x02ae
> bcdDevice : 0x10b Device 1.011
> iManufacturer : 0x2 Microsoft
> iProduct : 0x1 Xbox NUI Camera
> iSerialNumber : 0x3 A00365A11965050A
> bNumConfigurations : 0x1
> CONFIGURATION 1: 16 mA ===================================
> bLength : 0x9 (9 bytes)
> bDescriptorType : 0x2 Configuration
> wTotalLength : 0x20 (32 bytes)
> bNumInterfaces : 0x1
> bConfigurationValue : 0x1
> iConfiguration : 0x0
> bmAttributes : 0xc0 Self Powered
> bMaxPower : 0x8 (16 mA)
> INTERFACE 0: Vendor Specific ===========================
> bLength : 0x9 (9 bytes)
> bDescriptorType : 0x4 Interface
> bInterfaceNumber : 0x0
> bAlternateSetting : 0x0
> bNumEndpoints : 0x2
> bInterfaceClass : 0xff Vendor Specific
> bInterfaceSubClass : 0xff
> bInterfaceProtocol : 0xff
> iInterface : 0x0
> ENDPOINT 0x81: Isochronous IN ========================
> bLength : 0x7 (7 bytes)
> bDescriptorType : 0x5 Endpoint
> bEndpointAddress : 0x81 IN
> bmAttributes : 0x1 Isochronous
> wMaxPacketSize : 0xbc0 (3008 bytes)
> bInterval : 0x1
> ENDPOINT 0x82: Isochronous IN ========================
> bLength : 0x7 (7 bytes)
> bDescriptorType : 0x5 Endpoint
> bEndpointAddress : 0x82 IN
> bmAttributes : 0x1 Isochronous
> wMaxPacketSize : 0xbc0 (3008 bytes)
> bInterval : 0x1
>
> Any help would be appreciated.
> Regards, PetrS.
>
> ------------------------------------------------------------------------------
>
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>
--
Best Regards,
Wander Lairson Costa
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