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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:1.9.1.15) 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
http://www.sbrac.org