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RE: [Discuss-gnuradio] Embedded control of USRP

From: Jim Hanlon
Subject: RE: [Discuss-gnuradio] Embedded control of USRP
Date: Thu, 20 Apr 2006 13:38:52 -0500

 I tried to get the USRP talking to an 800MHz VIA fanless industrial control 
computer, with expansion card to get USB 2.0
performance. I found that gnuradio installed and ran OK, but USRP performance 
consistently exhibited USB overruns and underruns, to
the point that our evaluation of USRP capabilities was limited by our compute 

I think its nice to be fanless, if you can. And maybe, some clever engineering 
of USB interrupt service routines could improve i/o
performance. But  it is much simpler these days just to outrun the problem with 
a faster CPU clock. 

If you are trapped by form factor and "no fan" rules, you may be out of luck. 
Does your architecture allow for (say, USB) expansion
cards ?  If so, you could build one that did block transfers to/from the USB 
bus and your slowish CPU.
Jim Hanlon

> -----Original Message-----
> From: address@hidden 
> [mailto:address@hidden
> g] On Behalf Of Lee Patton
> Sent: Tuesday, April 18, 2006 5:19 PM
> To: Eric Blossom
> Cc: Discuss gnuradio
> Subject: Re: [Discuss-gnuradio] Embedded control of USRP
> On Mon, 2006-04-03 at 11:20 -0700, Eric Blossom wrote:
> > ... unless you're a glutton for punishment, don't get the Celeron 
> > version, spend the extra bucks and get the Pentium M.
> Besides the dearth of on-board cache, what are the other 
> drawbacks of a Celeron?
> To fit the dimensional requirement I was given (5"x5"x~1"), 
> the SBC must be passively cooled.  However, I'm not finding a 
> Pentium-M solution that can be passively cooled and meets our 
> availability requirements.  I have found a 600 MHz Celeron 
> solution, but has half the L2 cache.
> In our application, we'll be pulling full throttle from the 
> USRP, maybe FIR filtering, and then pushing back out to USRP. 
>  Not too heavy on the signal processing.
> All advice appreciated.
> - Lee
> P.S.
> Some potential solutions:
> http://www.gms4sbc.com/P60x_BO.html  (can't meet availability)
> http://www.kontron-emea.com/index.php?id=82&cat=58 (JRex-PM, 
> can only air cool Celeron M 600 MHz)
> _______________________________________________
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