Hi Sarah,
Many thanks for your reply, which seems right on the money other than the
platform -- it's my understanding that your patch (and bug) occur only in
linux.c, while I'm running OSX and I believe my libusb uses darwin.c. From a
rather cursory examination it appears to me that the code in darwin.c is
substantially different (of course, different USB APIs in Linux and OSX),
and in particular the set-error-but-not-description bug doesn't appear to be
there.
Makes sense? Am I missing something? Anyone else has comments?
Thanks again,
- Yaniv
On 10/21/07, Sarah Messer <iku...@ya...> wrote:
>
> This is due to a particular line in the source that sets an error-occurred
> flag but not the numerical error code itself. I've tried posting analysis
> and solution here<http://forums.ni.com/ni/board/message?board.id=140&message.id=21028&view=by_date_ascending&page=2>
> (as user SMesser) and here<http://sourceforge.net/tracker/index.php?func=detail&aid=1633542&group_id=1674&atid=101674>(as user spinmess). Look for the
> libusb.c patch I've posted.
>
> *Yaniv Aknin <ya...@ak...>* wrote:
>
> Hi,
>
> I'm trying to use PyUSB on OSX (10.4.10) to enumerate USB devices. I'm not
> entirely certain why, but upon calling getString on a device (almost any
> device on my system at least, and I have a few), I'm getting a USBError,
> with usb_control_msg: unknown error.
>
> My (slightly modified) lsusb.py source is:
>
> osx:pyusb yaniv$ cat lsusb.py
> #!/usr/bin/env python
>
> import usb
> import sys
>
> for bus in usb.busses():
> for dev in bus.devices:
> try:
> print "Bus %s Device %s: ID %04x:%04x %s" % (
> bus.dirname,dev.filename,dev.idVendor,dev.idProduct,dev.open
> ().getString(1,30))
> except:
> print 'caught ', sys.exc_info()[1]
> continue
> osx:pyusb yaniv$ ./lsusb.py
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): unknown error
> caught usb_control_msg(DeviceRequestTO): pipe is stalled
> caught usb_control_msg(DeviceRequestTO): pipe is stalled
> Bus 005 Device 002-05ac-8501-ff-ff: ID 05ac:8501 Micron
> caught usb_control_msg(DeviceRequestTO): pipe is stalled
> osx:pyusb yaniv$
>
> The exception is caught on the getString(), not on the open().
>
> I don't know what's special about this Micron device which works.
>
> I've tried running as UID 0 as well.
>
> Any further ideas?
>
> Many thanks,
> - Yaniv
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Splunk Inc.
> Still grepping through log files to find problems? Stop.
> Now Search log events and configuration files using AJAX and a browser.
> Download your FREE copy of Splunk now >>
> http://get.splunk.com/_______________________________________________
> Pyusb-users mailing list
> Pyu...@li...
> https://lists.sourceforge.net/lists/listinfo/pyusb-users
>
>
>
>
> -Sarah
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam? Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>
|
