Re: [Discuss-gnuradio] Faulty USRP microprocessor?

[Berndt Josef Wulf]

G'day,

I'm glad to inform that replacing the FX2 chip resolved the problem and the 
USRP appears to be fully operational, e.g. usrp_benchmark and usrp_wfm work 
out of the box.

I since tried to connect the board using a USB2.0 cable of 5m in length and 
can't establish communication with it. The cable length is within the USB2.0 
specifications. It may just be a poor quality or bad cable, but would like to 
hear if anyone else has been successful in using a long USB cable.

Using an oscilloscope, I can see a pulse train of about 0.5Vpp with channel A 
(D+) and channel B (D-) at the USRP connector. Does this sound right?

cheerio Berndt

On Thursday 13 November 2008 08:49:40 Berndt Josef Wulf wrote:
> G'day,
>
> I haven't made any progress in finding a solution to my problem. A direct
> email to Matt (Ettus) explaining my predicament didn't receive a reply. It
> was hoped that the manufacturer of the USRP would provide some after sale
> techmical support for their products.
>
> The USRP is no longer communicating when it was powered up after being in
> storage for the past 6 month. As mentioned in my previous email, see below,
> my suspect is the co-processor that hosts the USB interface, although I
> can't be sure. Perhaps someone on this list knows a procedure that would
> lead to an accurate diagnosis.
>
> At this stage I'm contemplating to replace the processor. What needs to be
> considered prior to replacing this processor, e.g. does it need to be
> flashed? I'm also looking for a supplier for this chip.
>
> Any help is very much appreciated.
>
> 73, Berndt
> VK5ABN
>
> On Tuesday 04 November 2008 22:28:38 Berndt Josef Wulf wrote:
> > G'day,
> >
> > today I discovered that my USRP appears to have a problem. The USRP
> > device is nolonger detected when connected to a PC (i386) running WinXP,
> > Linux or NetBSD. I tried different systems and cables to no avail. This
> > is with GNU-Radio current, but also tried with the last stable release.
> >
> > Power supply rail measures 3.3V after the regulator and the LED is fast
> > flashing, which normally would indicate that the processor is running,
> > but firmware hasn't been loaded. Signal lines from processor pins to
> > connector/cable have continuity. I'm now suspecting the USB interface on
> > the microprocessor chip.
> >
> > Has anyone had similar experience and what was the solution to your
> > problem? If so, what was your solution?
> >
> > I really would hate the idea of having to replace the microprocessor
> > because of lack of spares and in particular its package size.
> >
> > Any help is very much appreciated.
> >
> > 73, Berndt
> > VK5ABN
> >
> >
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