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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: Fri, 10 Feb 2012 12:12:48 -0500

Ive used XMLRPC for the same thing and you don't have to worry about unpacking 
integers into floating point etc

Principal Investigator
Shirleys Bay Radio
Astronomy Consortium

On Feb 10, 2012, at 10:49 AM, Ed Criscuolo <address@hidden> wrote:

> On 2/10/12 4:14 AM, Marius Ciepluch wrote:
>> So if someone knows how I can implement a callback or a polling function
>> to make the device tune for real, but as fast as possible, that'd be
>> very helpful.
> In the past, I've done external tuning via GRC with the following:
> Create a variable block (ie - "frequency"),  and put the name in
> the frequency parameter of the UHD-sink block.
> Create a subgraph consisting of a UDP source block and a variable
> sink block, aimed at the "frequency" variable.
> Use an external program to send a UDP packet to the port number
> of the UDP source block.  The packet should contain a single
> integer representing the frequency.  Pay attention to byte-order.
> I've used this setup to apply doppler correction from an external
> program when receiving telemetry from a spacecraft.  We were only
> sending packets about once per second, so I don't know how fast
> this setup will go, but it's worth pursuing.
> @(^.^)@  Ed
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