[USRP-users] Setting Registers in the E310 Flowgraph RFNoC block and seeing them change using Chipscope

Swanson, Craig Craig.Swanson at gtri.gatech.edu
Thu Oct 22 18:57:28 EDT 2015

I found the problem.  I needed to wait until the python script is already running.  It seems that the 50Mhz clock based signals can trigger even if the python script is running, but the radio clock won't.  So anything that is based off of the radio clock won't trigger until I run the script.


Craig F. Swanson
Research Engineer II
Information and Communications Laboratory
Communications, Systems, and Spectrum Division
Georgia Tech Research Institute
Room 560
250 14th St NW
Atlanta, GA 30318
Cell: 770.298.9156

From: Martin Braun <martin.braun at ettus.com>
Sent: Thursday, October 22, 2015 1:37 PM
To: Swanson, Craig; usrp-users at lists.ettus.com
Subject: Re: Setting Registers in the E310 Flowgraph RFNoC block and seeing them change using Chipscope


your XML files look fine. Are you sure the registers aren't triggered at
all, or is there maybe an issue with the ChipScope setup? I.e., if you
write some really obvious values to the registers, do they change
something in the signal output?


On 21.10.2015 14:31, Swanson, Craig wrote:
> ​Martin and Jonathon,
> I have an AGC2 RFNoC block that imitates the Moving_Average example that
> you have provided.  I chose the moving average because that seems to be
> the most plain vanilla version that is the least complicated to imitate.
>  I left some artifacts of the moving_average .xml files because I would
> break things if I removed all of them because I am not sure I understand
> how everything works in that demo yet. Especially the $length and streaming.
> I have created my agc2.xml, uhd_rfnoc_agc2.xml, .bit files, .grc, files
> for my AGC2 RFNOC HLS block and have it running on my E310 and am trying
> to trigger Chipscope.  When I change a register value from the
> flowgraph, it never indicates a change in Chipscope.
> My basic question is there anything else I need to do to link the
> registers setup in the flowgraph gr-ettus/grc/uhd_rfnoc_agc2.xml file
> with the uhd_usrp_probe agc2.xml file?
> I could provide some examples by copying and pasting here, but I am
> afraid it would be too large, so I have attached my files.
> Craig​
> *Craig F. Swanson*
> */Research Engineer II
> /*
> */Information and Communications Laboratory/*
> */Communications, Systems, and Spectrum Division/*
> /Georgia Tech Research Institute/
> /Room 560
> 250 14th St NW
> /
> /Atlanta, GA 30318/
> /Cell: 770.298.9156/
> http://www.gtri.gatech.edu
> <https://mail.gtri.gatech.edu/owa/redir.aspx?C=c20925f2f0af4dd29329ddf0701ecfff&URL=http%3a%2f%2fwww.gtri.gatech.edu%2f>

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