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

[Marcus D. Leech]

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
http://www.sbrac.org


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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