Re: [Discuss-gnuradio] Slow control external hardware

[Martin Braun]

http://gnuradio.org/doc/doxygen/page_python_blocks.html

$ git grep self.set_msg_handler **/*.py[19:20:26]
gr-blocks/python/blocks/qa_python_message_passing.py

M

On 07/29/2014 05:02 PM, Daniele Nicolodi wrote:
> 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,
> Daniele
> 
>>
>> 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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>>>
>>
>>
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> 
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