De : Brian Padalino [mailto:bpadal...@gmail.com]
Envoyé : jeudi 2 août 2018 16:57
À : TIMMEN Koen
Cc : USRP-users@lists.ettus.com
Objet : Re: [USRP-users] UHD API
First, let me tell you that I've done this exact thing so it's very possible.
I also agree the current examples are poor in the UHD repository when dealing
with most anything for RFNoC.
How did you setup your block to start and stop the transmission? It sounds
like maybe it's controlled using the settings registers? A little more
information about how you want to control your block would be useful here.
That is very good to hear.
Indeed the block is controlled through the settings registers. Sample
generation can start by setting a certain value in a register, samples are then
stored in a AXI FIFO at the end of the block. When the block is fully
activated, the FIFO will communicate with the downstream block as normal.
Streaming sends the data down to your block and the block receives it over the
main AXI streaming interface. It's meant for larger data sets, but it isn't
limited to that.
Have you created your own custom C++ controller block, or are you using the XML
definition to control your block? I write my own C++ controller blocks,
personally, and the XML is only there for defining the ID and the input/output
ports.
So streaming is communication from Host PC to your USRP? Not
between two NoC blocks for example?
Since I figured I only needed ‘sr_write’ and this is available from the
standard block controller, I did not code my own. I did verify the writing to
the registers using the readback register and that seems to work just fine.
For what reason would you recommend me writing my own block controller?
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