Re: [Discuss-gnuradio] Get a pointer to UHD Sink from other block in flow graph

[Tom Rondeau]

On Thu, Oct 16, 2014 at 8:54 AM, Marcus Müller <address@hidden> wrote:

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... and in C++ you can just use the sptr that you normally use when
using the uhd sink.

But: since Martin added the message ports to the UHD blocks, things
have gotten easier; you can just add an output message port to your
block and connect it to the message port of the UHD sink, and send
commands there without needing to care about objects, pointers, race
conditions...

also, if you want to do things like defining starts and ends of burst,
you might do so using the good ol' stream tags.

So many possibilities!

Greetings,
Marcus

 

Yes, Marcus is right. Use the message ports and stream tags to manipulate other blocks. Passing them around as references is bad practice because of lifecycle concerns of the block's use inside the scheduler. You want to communicate through interfaces, not the objects themselves.

Tom

 

On 16.10.2014 13:11, Koslowski, Sebastian (CEL) wrote:
>
> On 10/16/2014 12:41 PM, David Halls wrote:
>> Is there any way to get a pointer to a UHD sink block from
>> another block in a flow graph, such that I can read from the time
>> registers of a USRP?
>
> Depends how you're building your flow-graph: In Python, simply pass
> a reference to your UHD block object to your block. In GRC, there
> is no way to reference another block id in a block's params. Try
> this patch, if you want that [0]. Else, you could assume a fixed
> uhd sink block id and add that to your blocks XML's make template.
>
> Sebastian
>
> [0]
> https://github.com/skoslowski/gnuradio/commit/c90e2ddf1cea38ee2400ef56b234758048d980bf
>
>
>
>
> _______________________________________________ Discuss-gnuradio
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> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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