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Re: [Discuss-gnuradio] control port problem with incorrect throttle rate
From: |
Christiansen, Mark W. @ CSG - CSW |
Subject: |
Re: [Discuss-gnuradio] control port problem with incorrect throttle rate |
Date: |
Tue, 6 Mar 2018 13:10:28 +0000 |
Thanks, Jeff! I did your experiment and figured out that the setKnobs I do to
test for settability hits the throttle and apparently resets it, even if there
is no change. I added an additional command line argument to tell the script
whether to check settability and then only do that the first time I execute the
script.
Mark.
May the source be with you!
-----Original Message-----
From: Discuss-gnuradio [mailto:address@hidden On Behalf Of Jeff Long
Sent: Saturday, March 3, 2018 4:29 PM
To: address@hidden
Subject: [EXT] Re: [Discuss-gnuradio] control port problem with incorrect
throttle rate
I don't see any obvious reason this would happen, but maybe the flowgraph
glitches each time you connect and that does something to the throttle's
algorithm.
Try changing your program so it connects once, then iterates over the knobs in
a loop with a 1-sec sleep. That will tell you whether which part of the program
is causing this behavior.
On 03/03/2018 02:22 PM, Christiansen, Mark W. @ CSG - CSW wrote:
> I would like some help sorting out a problem I have with control port.
> I have a python script that runs every second to gather the current
> status of control port variables. It looks like that causes the
> flow-graph to speed up somewhat. I set up a simple flow-graph to test it.
>
> signal_source -> throttle -> probe_rate
>
> I have the throttle set to 32k. If I don't probe with my python
> script, the probe rate settles in close to 32k on control port monitor window.
> If I do have my python script running every second, then it averages
> about 34k but bouncing around from 33 to 35k on control port monitor
> window. I included my python script below.
>
> Thanks.
>
> Mark.
>
> "Simplicity is prerequisite for reliability."
>
> ~ Edsger W. Dijkstra
>
> -----------------------------------------
>
> #!/usr/bin/python
>
> # -*- coding: utf-8 -*-
>
> import sys, os, time, struct
>
> class MyApp(object):
>
> def __init__(self, args):
>
> from gnuradio.ctrlport.GNURadioControlPortClient import
> GNURadioControlPortClient
>
> program = sys.argv[0]
>
> hostIP = sys.argv[1]
>
> hostPort = sys.argv[2]
>
> fileName = sys.argv[3]
>
> GNURadioControlPortClient([program, hostIP, hostPort],
> 'thrift', self.store_radioclient)
>
> knobs_dict = self.radioclient.getKnobs([])
>
> f = open(fileName, 'w')
>
> for prop in knobs_dict:
>
> try:
>
>
> self.radioclient.setKnobs(self.radioclient.getKnobs([prop]))
>
> settable = True;
>
> except:
>
> settable = False;
>
> print >> f, prop, '#', settable , '#',
> str(knobs_dict[prop].value)
>
> # print prop, ' has value ', str(knobs_dict[prop].value)
>
> f.close()
>
> def store_radioclient(self, client):
>
> self.radioclient = client;
>
> # print '"',self.radioclient,'"'
>
> if __name__ == '__main__':
>
> MyApp(sys.argv)
>
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