Hi all,
Silly question, I'm using `sigrok-cli` with a DSLogic Plus to do some
analysis of some code performance at work.
Namely we've instrumented OpenThread to wiggle some GPIOs when a
802.15.4 frame is first received and whilst it is performing the AES-ECB
encryption (it implements its own AES-CCM atop mbedtls AES-ECB). The
aim is to compare the amount of time spent doing encryption whilst using
the microcontroller's hardware AES encryption module versus doing it in
software with mbedtls.
I've got `sigrok-cli` to capture 4 channels at 25MHz (any faster and it
gives up, despite the device being able to "stream" at 100MHz). I've
run 6 tests; 3 with hardware crypto enabled, and 3 without, and saved
the VCD dumps from `sigrok-cli`.
Now VCD is simple enough that I've been able to rough up some scripts to
analyse these, but the "there must be a better way" thought is still
nagging me to keep looking around.
Specifically, I want to be able to compare two waveforms side-by-side,
and gather some stats like how wide a given pulse is or how much time a
signal has been sampled in a given state.
Best I've found for just viewing the waveform has been `gtkview`.
However, it is quite limited. I haven't been able to get the sorts of
stats out I need.
PulseView can import a VCD, but doing so is a recipe for watching my
workstation grind to a halt until OOMkiller sorts it out. (A similar
foot-gun is setting the sample rate and period too high.)
I suspect PulseView may be trying to load the entire raw file into
memory: "decompressing" the changes and thus generating the original raw
samples. 40 seconds worth of 4-bit 25MHz samples is quite a lot of data
and I'm not sure how PulseView represents it internally -- perhaps that
is worth looking at.
DSView I know can give some of these stats, but it can't import VCDs at
all. Given it's a distant PulseView fork, I suspect it might have the
same problem if it did.
- Are there plans to address how PulseView manipulates pre-recorded
(specifically delta-recorded like VCD) data to prevent OOM issues?
- Are there plans to develop tools for manipulating (cropping, merging,
appending) logic traces for comparison and analysis?
Regards,
--
Stuart Longland (aka Redhatter, VK4MSL)
I haven't lost my mind...
...it's backed up on a tape somewhere.
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