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Re: [Discuss-gnuradio] Tune UHD - as fast as possible

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Tune UHD - as fast as possible
Date: Sat, 11 Feb 2012 10:09:18 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10

On 11/02/12 05:50 AM, Marius wrote:
> I hope it doesn't add any latency to the equation like: RPC command +
> UHD command + FPGA reaction + RF frontend. I'm not even sure if using
> the C++ API would be any different. So my Monday morning experiment
> now is set ;)
> Best,
> Marius
Well, yes, it will add latency. Not a lot, but *some*.   The hardware
generally takes about 1ms
  to tune and lock.

If you want absolute minimum latency without doing an FPGA-based
implementation, then stick
  entirely with the C++ API. GRC produces Python, and while the blocks
themselves are mostly
  written in C++, things like parameter changes to blocks (including
source/sinks) have to
  "percolate" through Python first, and it's an interpreted language.

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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