Re: [Discuss-gnuradio] GnuRadio 3.1.1 and USRP on Fedora 8

[Eric Blossom]

On Tue, Feb 12, 2008 at 04:30:00PM -0500, Ed Criscuolo wrote:
> Johnathan Corgan wrote:
>
>> Can you confirm that you are in fact using a USB 2.0 controller?  Your
>> symptoms are consistent with what happens when you have USB 1.1.  The
>> enumeration is able to successfully occur, so you get the device,
>> etc., but when the host tries to establish a high speed endpoint for
>> data transfer, it fails.
>>
>
>
> Arrrgh....  you hit the nail on the head!  USBView reports that the
> built-in hub is "Full-Speed", which is USB-speak for 1.1!
>
> Thanks.
>
> Any way the error reporting can be improved to explicitly indicate
> a 1.1 port?
>

It's ticket:90.  http://gnuradio.org/trac/ticket/90

It needs somebody willing to work on it.

The fix is probably a new function in usrp_prims.cc that fishes out the
bcdUSB field from the libusb usb_device_descriptor.  See usrp_usrp_p
for code that extracts info from the same descriptor.

Eric