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From: | Chad Spooner |
Subject: | Confusion about 'ports' |
Date: | Mon, 14 Mar 2022 16:02:31 -0700 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 |
All:
I've got a simple flowgraph with two USRP Source blocks and a single USRP Sink block:
This flowgraph is running on an x310. The upper Source block is supposed to stream data coming from another SDR, and the lower Source block is supposed to stream data from an antenna. Then I add these together and output the sum with the Sink block.
When I run it I get this error:
gr::log :ERROR: thread_body_wrapper - ERROR thread[thread-per-block[2]: <block usrp_source
(1)>]: RuntimeError: On node 0/DDC_0, output port 0 is already connected.
If I disable one of the Source blocks, things work as expected, so it is the presence of both that is the problem.
I can't tell from the documentation what a 'port' is, exactly.
And there isn't any error message in the companion itself, so I
guess it thinks this is OK.
Can somebody please point me to a clear discussion of how 'ports' enter here or please suggest a way to modify the flowgraph?
Thanks,
C
-- Chad M. Spooner, PhD NorthWest Research Associates 301 Webster Street Monterey, CA 93940 cmspooner@nwra.com 831 582 4904 cyclostationary.blog
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