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Re: [Discuss-gnuradio] usrp_* gains on Mac OS X much greater than on Lin
From: |
Lamar Owen |
Subject: |
Re: [Discuss-gnuradio] usrp_* gains on Mac OS X much greater than on Linux |
Date: |
Wed, 21 Dec 2005 22:15:51 -0500 |
User-agent: |
KMail/1.9.1 |
On Wednesday 21 December 2005 21:46, Matt Ettus wrote:
> Jonathan Jacky wrote:
> > I've observed something weird running some USRP programs on Mac OS X:
> > the gains in effect in usrp_siggen, usrp_oscope and usrp_fft seem
> > unreasonably large. I only get reasonable looking output (from
> > usrp_siggen) and input (with usrp_oscope and usrp_fft) with -a100 or
> > less, otherwise the output (or input) saturates or wraps around in a
> > very bizarre way.
> I think you are running into endianness issues here. That would give
> you an apparent gain of 256.
I would tend to agree; PowerPC is big endian, IIRC. So endian-agnostic
routines need to be used at the USRP level as well, it seems.
--
Lamar Owen
Director of Information Technology
Pisgah Astronomical Research Institute
1 PARI Drive
Rosman, NC 28772
(828)862-5554
www.pari.edu