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Re: [Discuss-gnuradio] Slow control external hardware

From: Daniele Nicolodi
Subject: Re: [Discuss-gnuradio] Slow control external hardware
Date: Tue, 29 Jul 2014 17:02:18 +0200
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On 29/07/2014 16:57, Martin Braun wrote:
> Daniele,
> 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.

Hello Martin,

thank for your answer. Can you please point me to an example of such
blocks from which I can take inspiration? I would like to code it in
python, therefore if a python block that uses the message passing
infrastructure exists, it would be great. Meanwhile I'm going to grep
through the code distribution...

Thanks! Cheers,

> M
> 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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