missing claimInterface() before using the control endpoint?
Just a guess
On Tue, Dec 14, 2010 at 18:54, Marcos Wolff <wmar...@gmail.com> wrote:
> Hi everyone,
>
> I'm having trouble comunicating with a custom made (from a PIC 18f4550
> micro-controller) HID device. Nowadays is used with windows and the default
> HID driver in vb6 but I would like to port it to linux (ubuntu 10.10) and
> pyusb (1.0a).
>
> The device is simple, when it receives 3 bytes via HID it responses 3 bytes
> back with data. The people who made it told me that everything is handled
> via end point 0 and default config).
>
> As I want to port it to linux I read this tutorial
> http://pyusb.sourceforge.net/docs/1.0/tutorial.html and tried to
> communicate via default config endpoint configuration:
>
> #prueba.py
>
> import usb.core
>
> #busco dispositivo
> dev = usb.core.find(idVendor=1240,idProduct=32)
> if dev is None:
> raise ValueError('Device not found')
>
> interface = dev.get_interface_altsetting()
> if dev.is_kernel_driver_active(interface.bInterfaceNumber) is True:
> dev.detach_kernel_driver(interface.bInterfaceNumber)
>
>
> dev.set_configuration()
>
> #mensaje de 3 bytes
> msg = '\x02\x03\x00'
>
> #bmRequestType y bRequest as said in
> http://www.jungo.com/st/support/documentation/windriver/811/wdusb_man_mhtml/node55.html#usb_standard_dev_req_codes
>
>
> dev.ctrl_transfer(0x40, 0x02, 0, 0, msg)
>
>
> and I get this error which I don't fully understand:
>
> Traceback (most recent call last):
> File "ejemplo.py", line 39, in <module>
> print dev.ctrl_transfer(0x40, 0x02, 0, 0, msg)
> File "/home/administrador/pyusb-1.0.0-a0/usb/core.py", line 668, in
> ctrl_transfer
> self.__get_timeout(timeout)
> File "/home/administrador/pyusb-1.0.0-a0/usb/_debug.py", line 53, in
> do_trace
> return f(*args, **named_args)
> File "/home/administrador/pyusb-1.0.0-a0/usb/backend/libusb10.py", line
> 538, in ctrl_transfer
> timeout))
> File "/home/administrador/pyusb-1.0.0-a0/usb/backend/libusb10.py", line
> 353, in _check
> raise USBError(_str_error[retval.value])
> *usb.core.USBError: Pipe error*
>
> Could someone guide me ? help me see what I'm doing wrong ?
>
> Thanks in advance !
> Marcos.
>
>
> PD: I tried to sniff usb ports with this tutorial
> http://biot.com/blog/usb-sniffing-on-linux but nothing seems to be
> happening excepto when I reset the device.
>
>
>
>
>
>
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