Thank you for the feedback everyone!
 
I am using FreeBSD 8, though we will probably be switching to Fedora in the 
future.


--- On Thu, 6/3/10, Xiaofan Chen <xiaof...@gmail.com> wrote:


From: Xiaofan Chen <xiaof...@gmail.com>
Subject: Re: [pyusb-users] interruptWrite gives unknown USB error
To: pyusb-users@lists.sourceforge.net
Date: Thursday, June 3, 2010, 1:14 AM


On Wed, Jun 2, 2010 at 11:56 PM, Ct Chev <ctc.1...@yahoo.com> wrote:

> and I get the following error:
> Traceback (most recent call last):
> File "usbenum.py", line 46, in <module>
> handle.interruptWrite(2, "*IDN?\n")
> usb.USBError: Unknown error
>
> Output from usbenum.py:
>
> Device: /dev/ugen2.3

So are you using FreeBSD? Which version of FreeBSD are you using?
>From my experience, libusb under FreeBSD 6/7 is basically not really
that usable unless you try the alternative HPS USB stack.

If you are using FreeBSD 8/9, the HPS stack is the default and
you will have better chance.



--
Xiaofan http://mcuee.blogspot.com

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