Hi guys, Quick feedback from my side: PV is certainly going to have RLE compression implemented, by fall if things go as planned.
The biggest hurdle is maintaining the drawing performance, as Gerhard pointed out. -Soeren On Tue, 2019-09-24 at 11:08 +0200, David Given wrote: > I was in the same position a little while back, when I needed to > compare traces from multiple captures. I didn't find anything, > unfortunately. > > What I ended up doing was writing a little tool which converted my > captures into audio files, and then loading them as multiple tracks > into Audacity for visual comparison. I was only capturing about > 1000ms of single-channel data at 24MHz so the file sizes were > reasonable. But Audacity is actually a reasonably good poor-man's- > waveform-visualiser, having useful features like the ability to nudge > traces left and right to make them line up. > > On Tue, 24 Sep 2019 at 03:24, Stuart Longland < > stua...@longlandclan.id.au> wrote: > > 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. > > > > > > _______________________________________________ > > sigrok-devel mailing list > > sigrok-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/sigrok-devel > > > _______________________________________________ > sigrok-devel mailing list > sigrok-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sigrok-devel _______________________________________________ sigrok-devel mailing list sigrok-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sigrok-devel
