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

From: David Halls
Subject: Re: [Discuss-gnuradio] Get a pointer to UHD Sink from other block in flow graph
Date: Thu, 16 Oct 2014 14:19:30 +0000

Thanks Sebastian,

My solution in the end was to use a UHD source, which generates rx_time, I then created a block which reads in this rx_time tag and sends it as a message to a block just before my UHD sink which converts this to a tx_time based on the number of bursts sent, and the burst interval that I desire.

Note that if you are transmitting MIMO, i.e. multiple USRPs in one UHD sink, you also have to use multiple USRPs in the UHD source to produce the rx_time (although they multiple rx_times will be equal).



-----Original Message-----
From: Koslowski, Sebastian (CEL) [mailto:address@hidden
Sent: 16 October 2014 12:12
To: David Halls; address@hidden
Subject: Re: [Discuss-gnuradio] Get a pointer to UHD Sink from other block in flow graph

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.



Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

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Phone: +49 721 608-46275
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