Perhaps I am not reading the right parts of the documentation but I can't
figure out how to write to my device even given your hints about my device
not having endpoints. Frankly I don't even know what an endpoint is. I was
hoping not to have to know. :-) I just need to send some simple strings to
my device and get back some floats.
Also how can I issue my own GET_STRING request to get a description of a
serial number, for example?
On Fri, Jul 16, 2010 at 8:43 AM, Wander Lairson <wander.lair...@gmail.com>wrote:
> 2010/7/16 John Harrison <johnharrison...@gmail.com>:
> > Running testlibusb-win.exe I see:
> >
> > DLL version: 1.2.0.0
> > Driver version: 1.2.0.0
> >
> > bus/device idVendor/idProduct
> > bus-0/\\.\libusb0-0002--0x09db-0x00f9 09DB/00F9
> > - Manufacturer : Measurement Computing
> > - Product : USB-2001-TC
> > - Serial Number: 014F0F9C
> > wTotalLength: 18
> > bNumInterfaces: 1
> > bConfigurationValue: 1
> > iConfiguration: 0
> > bmAttributes: 80h
> > MaxPower: 250
> > bInterfaceNumber: 0
> > bAlternateSetting: 0
> > bNumEndpoints: 0
> > bInterfaceClass: 255
> > bInterfaceSubClass: 255
> > bInterfaceProtocol: 0
> > iInterface: 0
> >
> > The product and Manufacturer match the device I am trying to communicate
> > with. BTW these values seem different with pyUSB. For example
> >
> > dev = usb.core.find(idVendor=0x09db, idProduct=0x00f9)
> > dev.iSerialNumber
> >
> > returns the value 3.
>
> I guess testlibusb-win issues a GET_STRING request over the value 3 to
> get a description of the serial number. Therefore it is ok.
> Now backing to your original problem, your device doesn't have any
> endpoints, this is because find_descriptor returned None and the
> assertion failed. Maybe your device only talks through endpoint 0 (a
> control endpoint that is kind of built-in).
>
> >
> > -John
> >
> > On Thu, Jul 15, 2010 at 6:02 PM, Xiaofan Chen <xiaof...@gmail.com>
> wrote:
> >>
> >> On Fri, Jul 16, 2010 at 2:12 AM, Wander Lairson
> >> <wander.lair...@gmail.com> wrote:
> >> > 2010/7/15 John Harrison <johnharrison...@gmail.com>:
> >> >> libusb-win32-bin-1.2.0.0\bin\x86>testlibusb.exe
> >> >> Dev #0: 0000 - 0000
> >> >> Dev #2: Measurement Computing - USB-2001-TC
> >> >>
> >> >> Dev #2 is the correct name for my device.
> >> >
> >> > Oh, sorry, I mentioned the wrong test app. I don't remember its name
> >> > and I don't have an Windows machine right now, but I mean the test
> >> > application with graphical interface, which dumps all device
> >> > descriptors...
> >>
> >> testlibusb-win.exe
> >>
> >> To John:
> >>
> >> +++++++++++++
> >> http://sourceforge.net/apps/trac/libusb-win32/wiki
> >> Please describe your problems and your system as precise as possible
> >> (OS, service packs, version of libusb-win32, type of device, output of
> >> "testlibusb-win.exe", etc.). This will make solving problems a lot
> easier.
> >> +++++++++++++
> >>
> >> BTW, if you have not done so, please update to libusb-win32 1.2.0.0.
> >>
> >> --
> >> Xiaofan http://sourceforge.net/projects/libusb-win32/
> >>
> >>
> >>
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> >
> >
> >
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> >
>
>
>
> --
> Best Regards,
> Wander Lairson Costa
>
>
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--
John
http://alumni.media.mit.edu/~harrison/
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