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Re: [pyusb-users] Error doing control transfer
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From: vvyogi . <vv...@gm...> - 2013-10-02 14:13:29
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Here is the detailed LOG:
2013-10-02 19:41:55,566 DEBUG:usb.backend.libusb1:_LibUSB.__init__(<WinDLL
>> 'C:\openocd-0.7.0\bin\libusb-1.0.dll', handle 6b600000 at 18e44d0>)
>
> 2013-10-02 19:41:55,571 INFO:usb.core:find(): using backend
>> "usb.backend.libusb1"
>
> 2013-10-02 19:41:55,571
>> DEBUG:usb.backend.libusb1:_LibUSB.enumerate_devices()
>
> 2013-10-02 19:41:55,634
>> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
>> object at 0x019496F0>)
>
> 2013-10-02 19:41:55,634
>> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
>> object at 0x01949790>)
>
> 2013-10-02 19:41:55,634
>> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
>> object at 0x01949750>)
>
> 2013-10-02 19:41:55,634
>> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
>> object at 0x019497B0>)
>
> 2013-10-02 19:41:55,634
>> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
>> object at 0x019496F0>)
>
> 2013-10-02 19:41:55,634
>> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
>> object at 0x01949790>)
>
> 2013-10-02 19:41:55,635
>> DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device
>> object at 0x01949750>)
>
> VUSB_HID Device Found
>
> 1
>
> 255
>
> 18
>
> 2013-10-02 19:41:55,635
>> DEBUG:usb.backend.libusb1:_LibUSB.get_configuration_descriptor(<usb.backend.libusb1._Device
>> object at 0x01949750>, 0)
>
> 2013-10-02 19:41:55,635
>> DEBUG:usb.backend.libusb1:_LibUSB.open_device(<usb.backend.libusb1._Device
>> object at 0x01949750>)
>
> 2013-10-02 19:41:55,637
>> DEBUG:usb.backend.libusb1:_LibUSB.set_configuration(<usb.backend.libusb1._DeviceHandle
>> object at 0x01857970>, 1)
>
> Traceback (most recent call last):
>
> File "myu.py", line 24, in <module>
>
> dev.set_configuration()
>
> File "C:\Python27\lib\site-packages\usb\core.py", line 559, in
>> set_configuration
>
> self._ctx.managed_set_configuration(self, configuration)
>
> File "C:\Python27\lib\site-packages\usb\core.py", line 92, 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 741,
>> 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 571,
>> in _check
>
> raise USBError(_str_error[ret], ret, _libusb_errno[ret])
>
> usb.core.USBError: [Errno 2] Entity not found
>
> 2013-10-02 19:41:55,655
>> DEBUG:usb.backend.libusb1:_LibUSB.close_device(<usb.backend.libusb1._DeviceHandle
>> object at 0x01857970>)
>
> 2013-10-02 19:41:55,657 DEBUG:usb.backend.libusb1:_LibUSB.__del__()
>
>
On Wed, Oct 2, 2013 at 7:31 PM, Wander Lairson Costa <
wan...@gm...> wrote:
> 2013/10/2 vvyogi . <vv...@gm...>
> >
> > I installed pyUsb from the the master branch (github), and I wrote the
> following code
> >>
> >>
> >> import usb.core
> >> import usb.util
> >> import sys
> >> import os
> >> # find our device
> >> os.environ['PYUSB_DEBUG_LEVEL'] = 'debug' # IS THIS RIGHT WAY TO DO
> THE ENVIRONMENT VARIABLES
> >> os.environ['PYUSB_DEBUG'] = 'debug'
> >>
>
> You have to setup environment variables before importing usb stuff.
> That's because you aren't getting any log.
>
> >> dev = usb.core.find(idVendor=5824, idProduct=1503)
> >> # was it found?
> >> if dev is None:
> >> raise ValueError('Device not found')
> >>
> >> print "VUSB Device Found"
> >> print dev.bNumConfigurations
> >> print dev.bDeviceClass
> >> print dev.bLength
> >> # set the active configuration. With no arguments, the first
> >> # configuration will be the active one
> >> dev.set_configuration()
> >> dev.ret = dev.ctrl_transfer(0xC0, 0x00, 0, 0, 128)
> >
> >
> > This is the output:
> >>
> >> VUSB Device Found
> >> 1
> >> 255
> >> 18
> >>
> >> Traceback (most recent call last):
> >> File "myu.py", line 24, in <module>
> >> dev.set_configuration()
> >> File "C:\Python27\lib\site-packages\usb\core.py", line 559, in
> set_configuration
> >>
> >> self._ctx.managed_set_configuration(self, configuration)
> >> File "C:\Python27\lib\site-packages\usb\core.py", line 92, in
> managed_set_configuration
> >> self.backend.set_configuration(self.handle, cfg.bConfigurationValue)
> >> File "C:\Python27\lib\site-packages\usb\backend\libusb1.py", line
> 741, 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
> 571, in _check
> >>
> >> raise USBError(_str_error[ret], ret, _libusb_errno[ret])
> >> usb.core.USBError: [Errno 2] Entity not found
> >
> >
> > It seems almost same to the previous log.
> > As for the libUsbDotNet, I don't know how do I figure out its back-end.
> I ran a libUsbtest application that came with LibUSB-Win32 and Its snapshot
> is attached.
> >
> >
> >
> > Thanks and Regards
> > Vivek
> >
> > On Wed, Oct 2, 2013 at 5:45 PM, Wander Lairson Costa <
> wan...@gm...> wrote:
> >>
> >> 2013/10/2 vvyogi . <vv...@gm...>:
> >> > This is the complete log
> >> >
> >> >> Traceback (most recent call last):
> >> >> File "myu.py", line 21, in <module>
> >> >> dev.set_configuration()
> >> >> File "C:\Python27\lib\site-packages\usb\core.py", line 547, in
> >> >> set_configuration
> >> >> self._ctx.managed_set_configuration(self, configuration)
> >> >> File "C:\Python27\lib\site-packages\usb\core.py", line 92, in
> >> >> managed_set_configuration
> >> >> self.backend.set_configuration(self.handle,
> cfg.bConfigurationValue)
> >> >> File "C:\Python27\lib\site-packages\usb\backend\libusb10.py", line
> 503,
> >> >> in set_configuration
> >> >> _check(_lib.libusb_set_configuration(dev_handle, config_value))
> >> >> File "C:\Python27\lib\site-packages\usb\backend\libusb10.py", line
> 403,
> >> >> in _check
> >> >> raise USBError(_str_error[ret], ret, _libusb_errno[ret])
> >> >> usb.core.USBError: [Errno 2] Entity not found
> >> >
> >>
> >> set_configuration is faling here, but this you probably already know...
> >>
> >> >
> >> > My code is as follows
> >> >
> >> >> import usb.core
> >> >> import usb.util
> >> >> import sys
> >> >> # find our device
> >> >> dev = usb.core.find(idVendor=5824, idProduct=1503)
> >> >> # was it found?
> >> >> if dev is None:
> >> >> raise ValueError('Device not found')
> >> >>
> >> >> print "VUSB Device Found" ## THE DEVICE GETS DETECTED
> >> >>
> >> >>
> >> >>
> >> >> print dev.bNumConfigurations
> >> >> print dev.bDeviceClass
> >> >> print dev.bLength
> >> >>
> >> >> # set the active configuration. With no arguments, the first
> >> >> # configuration will be the active one
> >> >>
> >> >> dev.set_configuration()
> >> >> dev.ret = dev.ctrl_transfer(0xC0, 0x00, 0, 0, 128)
> >> >
> >>
> >> Your code looks fine, at least until the set_configuration call.
> >>
> >> >
> >> >
> >> > My OS is Windows 7 32-bit, using python 2.7.3 and pyusb-1.0.0a2
> >> > In above code the Device gets detected, but fails at the point where
> 'set
> >> > configuration' happens..
> >> >
> >>
> >> What about latest pyusb code from github?
> >>
> >> > I tried equivalent code in C#(based on libUsbDotNet, which is also a
> wrapper
> >> > on libusb), and it worked fine.
> >> > Here is the c# code snippet for reference.
> >> >>
> >> >> MyUsbDevice = UsbDevice.OpenUsbDevice(MyUsbFinder);
> >> >> // If the device is open and ready
> >> >> if (MyUsbDevice == null) throw new Exception("Device
> Not
> >> >> Found.");
> >> >> // If this is a "whole" usb device (libusb-win32,
> linux
> >> >> libusb)
> >> >> // it will have an IUsbDevice interface. If not
> (WinUSB)
> >> >> the
> >> >> // variable will be null indicating this is an
> interface
> >> >> of a
> >> >> // device.
> >> >> IUsbDevice wholeUsbDevice = MyUsbDevice as
> IUsbDevice;
> >> >>
> >> >> if (!ReferenceEquals(wholeUsbDevice, null))
> >> >> {
> >> >> // This is a "whole" USB device. Before it can be
> >> >> used,
> >> >> // the desired configuration and interface must
> be
> >> >> selected.
> >> >> // Select config #1
> >> >> wholeUsbDevice.SetConfiguration(1);
> >> >> // Claim interface #0.
> >> >> wholeUsbDevice.ClaimInterface(0);
> >> >> Console.WriteLine("\r\nMAc MAc!\r\n");
> >> >> }
> >> >>
> >> >> UsbSetupPacket setup = new UsbSetupPacket(0xC0,
> 0x01, 0,
> >> >> 0, 128);
> >> >> bool result = MyUsbDevice.ControlTransfer(ref setup,
> >> >> buffer, 128, out ltt);
> >> >> Console.WriteLine("Result = {0}", result);
> >> >
> >> >
> >> >
> >> > The only difference that I could find is that the c# code is doing
> >> > 'CLAIM_INTERFACE', but that is done automatically by pyUsb.
> >> > Other thing that comes to my mind is the USB_BACKEND being in use by
> pyUsb.
> >> > I have not installed winUSB or OpenUSB. How do I check my currently
> active
> >> > USB backend.
> >> > what Is wrong with my python code?
> >> >
> >>
> >> Your PyUSB backend is libusb 1.0, libusbdotnet can use libusb-win32,
> >> WinUSB or libusb 1.0. AFAIK, libusb 1.0 production code can only use
> >> WinUSB right now.
> >> Do you know what backend is being used by libusbdotnet?
> >>
> >> Let's try to see what PyUSB is doing. Please, define the environment
> >> variable PYUSB_DEBUG_LEVEL=debug (for a2 release) or PYUSB_DEBUG=debug
> >> (for github HEAD), run your program again and post here the logs.
> >>
> >>
> >> --
> >> Best Regards,
> >> Wander Lairson Costa
> >>
> >>
> ------------------------------------------------------------------------------
> >> October Webinars: Code for Performance
> >> Free Intel webinars can help you accelerate application performance.
> >> Explore tips for MPI, OpenMP, advanced profiling, and more. Get the
> most from
> >> the latest Intel processors and coprocessors. See abstracts and
> register >
> >>
> http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk
> >> _______________________________________________
> >> pyusb-users mailing list
> >> pyu...@li...
> >> https://lists.sourceforge.net/lists/listinfo/pyusb-users
> >
> >
> >
> >
> ------------------------------------------------------------------------------
> > October Webinars: Code for Performance
> > Free Intel webinars can help you accelerate application performance.
> > Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most
> from
> > the latest Intel processors and coprocessors. See abstracts and register
> >
> >
> http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk
> > _______________________________________________
> > pyusb-users mailing list
> > pyu...@li...
> > https://lists.sourceforge.net/lists/listinfo/pyusb-users
> >
>
>
>
> --
> Best Regards,
> Wander Lairson Costa
>
>
> ------------------------------------------------------------------------------
> October Webinars: Code for Performance
> Free Intel webinars can help you accelerate application performance.
> Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most
> from
> the latest Intel processors and coprocessors. See abstracts and register >
> http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk
> _______________________________________________
> pyusb-users mailing list
> pyu...@li...
> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>
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