Hi again,
After way too much time spent trying to debug my issues, and renaming
all the variables, I wasn't getting anywhere. Then I discovered xmllint
which pointed out a few (!) more xml errors in a completely different
section of the rfnocblock XML file. After fixing this, I've got the
resampler part working.
Regards, Paul Boven.
On 28/02/2019 10:30, Paul Boven via USRP-users wrote:
Hi Jonathon,
Thanks for looking at the block, and spotting the mistake.
Unfortunately that doesn't stop the swig part from failing, so I'll keep
digging further.
Regards, Paul Boven.
On 28/02/2019 04:19, Jonathon Pendlum wrote:
Hi Paul,
Your Nocscript has an error on line 47, you are a missing a comma:
LE($config 1) should be LE($config, 1). That may not be the source of
your issue, but try fixing that first.
Jonathon
On Thu, Feb 28, 2019 at 1:14 AM Paul Boven via USRP-users
<usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> wrote:
Hi everyone,
As part of the VLBI[1] backend that I'm making in RFNOC, my first
step
is to make a rational resampler. It takes the 100MS/s signal from a
TwinRX, and reduces it to 80MS/s. This can be done with a 5:4
resampler.
In order to make this work, I'm using the axi_rate_change block.
Although the block works in simulation, I keep running into problems
with the GRC integration, in particular SWIG throwing run-time
errors.
The problem seems to be in the way that the arguments (N, M, config)
are
passed around, but studying other blocks like the DDC block hasn't
provided the clues for me to get past this hurdle.
The resampler itself does work, which I tested by having it emit
zeroes
instead of the 'deleted' samples, and using a 'keen 1 in N' in GRC
itself.
At the moment, the block exits in VLBI_swig.py in set_arg:
return _VLBI_swig_resamplerd5x4_sptr_set_arg(self, *args)
RuntimeError: SyntaxError: Parsing Stopped at: $N, 5)
If you're familiar with RFNOC, can you please have a look at:
http://www.jive.nl/~boven/rfnoc-VLBI
It contains the source, and also a compiled bitfile for the X310 for
your convenience (but use at your own risk, of course).
Regards, Paul Boven.
[1] Very Long Baseline Interferometry
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