RE: [Discuss-gnuradio] Embedded control of USRP

[Jim Hanlon]

 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 
power. 

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.
HTH
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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