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Re: [Discuss-gnuradio] Block taking in message, outputting items

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Block taking in message, outputting items
Date: Thu, 16 Oct 2014 17:37:24 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

Hi David,

"items" is a output/input buffer stream term in GNU Radio.
You can just put whatever data type you'd want (ok, a lot of data types) into PMTs, and send them around; for sample vectors, PMT uniform vectors are the way to go.
If you just use message passing, you don't need to implement a meaningfull work() function -- you don't even have to actually use a subclass of gr::block (but I recommend doing that for the sake of getting loads of functionality for free).

Most probably there are blocks that do what you want, maybe you want something like
random source --> throttle [1] --> message sink?


[1] this is one of the *very* few times I'd recommend using throttle. Otherwise, the source will just run at maximum speed and roast the message passing system to a fine crisp.

On 16.10.2014 16:30, David Halls wrote:
Dear All,

How can I create a block like 'Random PDU Generator', but that outputs items rather than PDUs over a message port?

Hopefully its easy but I am not clear if I need a work function or not, and if I don't have one then how do I pass the items out, as one does in a normal block?

Perhaps there are already blocks that do what I am trying to achieve?

Thanks for your help!!



David Halls Ph.D.
Research Engineer
Toshiba Research Europe Limited
32 Queen Square, Bristol, BS1 4ND, UK
Tel: +44 (0) 117 906 0790


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