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Re: [Discuss-gnuradio] Delta 44

From: n4hy
Subject: Re: [Discuss-gnuradio] Delta 44
Date: Fri, 27 May 2005 14:47:10 +0000
User-agent: Mozilla Thunderbird 1.0.2 (Windows/20050317)

The performance impact was almost negligible. I am still having trouble with the fully updated usrp/gr-usrp code at home. tvrx_wfm_rcv.py complains bitterly about 0xf0f0f0f[02] yielding an overload it hates. Here at work, in an older version of this code, I just subbed in 0 and 2 for these numbers and everything seemed to work but this "trick" does not work
on the new stuff at home.

Guidance needed.


Eric Blossom wrote:

On Fri, May 27, 2005 at 05:48:18AM -0600, Bob McGwier N4HY wrote:

Even though the Delta 44 has only four inputs and four outputs (all
balanced monoaural), it reports twelve through ALSA to jack.  I can
tell this is happening since dial_tone.py and tvrx_wfm_rcv.py both
blow up with complaints about the number of sinks.  multi_tone.py
works perfectly since it loads stuff up for all gazoutas.

Has anyone done a general work around for this?

Try using plughw:0,0 instead of hw:0,0 as the pcm device (second arg
to audio.source and audio.sink.  plughw:0,0 should send something (not
sure what) to all i/os.  Not sure of the performance impact.  A bit of
measuring with oprofile will reveal all.

It sounds like a fix for the Delta-44 ALSA driver is in order too.
This assumes that the driver can tell the difference between a
Delta-44 and other boards with the same chip set.

You might want to post this question to the JACK or ALSA mailing lists.


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