Re: [Discuss-gnuradio] How to access UHD from within my own OOT block?

[Marcus Müller]

Two things:
1. Martin was right, doing this using messages is cleaner!
2. GRC generates python files when you click the generate button. You
can change these files to your heart's delight; most C++ public
functions are even exported to the encapsulating python class.
Furthermore, you can write blocks in C++ and python, and you can write
hierarchical and top_blocks also in C++ and python, so calling public
functions of blocks is really the easiest thing you will concern
yourself with when doing GNU Radio development.

The GNU Radio website has new, exciting tutorials, and I encourage you
to go through them. As it seems, the first few tutorials will can be
done quickly with your experience!

Greetings,
Marcus

On 09.10.2014 09:54, Boschma, J.J. (Jeroen) wrote:
> Hi Marcus,
>
> Thanks for your answer but it is still not clear to me how to use this 
> interface. If I understand correctly, you propose to use the class public 
> member functions directly for changing center frequency etc:
>
>     http://gnuradio.org/doc/doxygen/classgr_1_1uhd_1_1usrp__sink.html
>
> This would be very simple indeed. But in order to do so, I need the pointer 
> to the actual instantiation of the USRP-sink. And that pointer is, if I'm 
> correct, somewhere in the encapsulating framework generated by the Companion 
> GUI when running my project, and I cannot see how I can access that pointer 
> from within my own OOT block.
>
> Regards,
>
>      Jeroen
>
> From: address@hidden [mailto:address@hidden On Behalf Of Marcus Müller
> Sent: woensdag 8 oktober 2014 16:11
> To: address@hidden
> Subject: Re: [Discuss-gnuradio] How to access UHD from within my own OOT 
> block?
>
> Hi Jeroen,
>
> the usrp blocks have public methods to do exactly that. It really looks like 
> what you've proposed :)
>
> Not so long ago, Martin added support for doing things like that by sending 
> messages or stream tags to the block, too.
>
> As you haven't found a starting point yet: Here's GNU Radio's official API 
> documentation:
> http://gnuradio.org/doc/doxygen/
> and the gr-uhd blocks are here:
> http://gnuradio.org/doc/doxygen/group__uhd__blk.html
> http://gnuradio.org/doc/doxygen/namespacegr_1_1uhd.html
>
> Quite straightforward :)
>
> Greetings,
> Marcus
> On 08.10.2014 16:01, Boschma, J.J. (Jeroen) wrote:
>
> Dear all,
>
>
>
> In the Companion GUI I use the UHD source- and sink-blocks, together with my 
> own OOT blocks. Now I want to control the UHD blocks from within my own 
> blocks, for example changing the center frequency. So in my own block I would 
> like to write something like:
>
>
>
>     usrp->set_center_freq(whatever);
>
>
>
> I there an easy interface/API available to do this? Or do I have to download 
> the gr-uhd, modify it (maybe add a method to get a pointer to the USRP out of 
> it?) and rebuild? Unfortunately I just could not find a starting point yet.
>
>
>
> Regards,
>
>
>
>       Jeroen
>
>
>
>
>
>
>
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