Okay I'm with you now. Your confusion is definitely warranted. Something's
gotta be different between the PRBS and loopback... May be worth trying to
manually run each PRBS/loopback test by running ocpirun -p on the command
line and using the calculate BER executable on the output files. Double
check which assembly is loaded in each case to ensure it's not loading a
different one - ocpihdl get should show an assembly UUID.
---------- Forwarded message ---------
From: Brian Padalino <bpadalino_at_gmail.com>
Date: Fri, Apr 3, 2020 at 3:08 PM
Subject: Re: [Discuss OpenCPI] Fwd: Fwd: AD9361 ADC/DAC Test Applications
To: Davis Hoover <dhoover_at_geontech.com>
Cc: <discuss_at_lists.opencpi.org>
On Fri, Apr 3, 2020 at 2:45 PM Davis Hoover <dhoover_at_geontech.com> wrote:
> The AD9361 BIST PRBS mode utilizes an on-AD9361 LFSR. The OpenCPI
> applications for both the AD9361 BIST PRBS, which verifies the ADC
> interface, and the AD9361 BIST loopback, which verifies the DAC and ADC
> interface, each utilize the same bitwise LFSR verification on the .out
> file(s).
>
So this is where the confusion comes from. There is a mode which runs such
that the data_src is set to 'mode=lfsr', the spec is here:
https://gitlab.com/opencpi/opencpi/-/blob/7b689ca89f329f1845290626ab95647946877082/projects/assets/components/misc_comps/specs/data_src-spec.xml#L48
The script is here:
https://gitlab.com/opencpi/opencpi/-/blob/7b689ca89f329f1845290626ab95647946877082/projects/assets/applications/ad9361_dac_test/scripts/AD9361_BIST_loopback.sh#L249
And it's called here:
https://gitlab.com/opencpi/opencpi/-/blob/7b689ca89f329f1845290626ab95647946877082/projects/assets/applications/ad9361_dac_test/scripts/ad9361_dac_test.sh#L147
But the PRBS test is called here:
https://gitlab.com/opencpi/opencpi/-/blob/7b689ca89f329f1845290626ab95647946877082/projects/assets/applications/ad9361_dac_test/scripts/ad9361_dac_test.sh#L86
So if I comment out the PRBS test, and only run the loopback test - things
work spectacularly great - 0% BER.
But the PRBS test runs with 30% BER.
I suppose I should have clarified specifically I am using the loopback test
when it shows 0% BER.
Does this help shed any light on anything, especially regarding my
confusion? I would have thought the loopback test would fail miserably if
the PRBS test also does. But this is not the case.
Thanks,
Brian
Received on Fri Apr 03 2020 - 20:24:04 CDT