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Re: [Discuss-gnuradio] Slow control external hardware

From: Martin Braun
Subject: Re: [Discuss-gnuradio] Slow control external hardware
Date: Tue, 29 Jul 2014 16:57:12 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0


there's loads of blocks that use messages, as well as manual pages for
that. And I would recommend you use them for this case. Create a block
that talks to the serial port, and give it a message port.


On 07/29/2014 02:55 PM, Daniele Nicolodi wrote:
> Hello,
> I need to control a RF synthesizer from within a GNURadio flowchart
> updating some parameters on the base of some measurements obtained from
> processing data collected by an USRP.
> The synthesizer is connected through a RS232 serial port, thus is quite
> slow, but the bandwidth of the control is also very small, < 1Hz. One of
> the parameters that needs to be controlled is the output power, and it
> can be adjusted only in discrete steps of 0.01 dB, therefore I need to
> correctly take care of the discretization.
> What is the best strategy to do that? Should I simply implement a sink
> block? Would be better to implement the discretization in a sink block
> that then sends messages to another block that handles the communication
> with the synthesizer?
> As far as my experimentation goes, there are no blocks using messages in
> the standard GNURadio distribution (version 3.7.2), therefore I don't
> really have examples of use cases for it.
> Thanks. Cheers,
> Daniele
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