Re: [Discuss-gnuradio] connect/disconnect blocks in hierarchical block depending on a variable

[Thabet GHARBI]

Hi Marcus,

Thanks for the tip.

In this case, what type of conditions to use to reconfigure a flowgraph (connect/disconnect blocks)?

In GNU Radio usage manual, the only example given is time condition "time.sleep(0.01)" 

https://www.gnuradio.org/doc/doxygen/page_operating_fg.html

 

Best Regards,

Le lun. 21 oct. 2019 à 13:22, Müller, Marcus (CEL) <address@hidden> a écrit :

Hello!

Re: 1

That's not how GNU Radio should be used, and thus, it's impossible to
do that, architecturally. Connecting blocks pretty much has non-
deterministic behaviour w.r.t. to buffer state, and also, without the
block connected, your flow graph probably wouldn't be properly
connected and couldn't even start!

Instead, have a block (not a hier block) that outputs items according
to some state. Often, it's easy to transport state transitions as
stream tags.

Re: 2

Hier blocks shouldn't be involved in signal processing. So, although
it's generally possible to make a hier block a message acceptor, it's
rarely a good idea.

Best regards,
Marcus


On Mon, 2019-10-21 at 10:52 +0200, Thabet GHARBI wrote:
> Hello,
>
> I'm writing a hierarchical block in C++, in which I instantiate 3 custom (hier)blocks.
> I want to start Block1 only, and depending on the value of one of its attributes (which changes during processing), disconnect it, and connect either block2 or block3,
>
> 1- What's the simplest way to do this?
> 2- In case we use "message passing", is it possible to interpret the message at hierarchical block level?
>
> Thanks in advance.
> 
> Best Regards,
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
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