Hi Santiago,
Following this tutorial it doesn't seem to be needed:
http://pyusb.sourceforge.net/docs/1.0/tutorial.htm#talk-to-me-honey
Anyway I've tried (kind of desperate here) and didn't work :(
thank for the quick answer !
On Tue, Dec 14, 2010 at 3:18 PM, Santiago Palomino Sanchez-Manjavacas <
sps...@gmail.com> wrote:
> 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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>>
>
>
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