BeagleLogic logic analyzer on PocketBeagle

[Randy Rossi]

I recently got the BeagleLogic logic analyzer (https://github.com/abhishek-kakkar/BeagleLogic) running on the PocketBeagle under a linux 4.9 kernel.  It pretty much works as-is.  However, only 4 of the 20 pins that can be configured as pruin produce any results.   My (limited) understanding is that the black and pocket processors are the same (AM335x) so I would have expected R31 in the assembly code to be able to read all pins.  Anyone have experience with getting the PRUs on the Pocket to read pins other than {p1_2, p1_4, p1_35, p2_35}?  All my pins were configured as pruin when I was testing.  Maybe some mapping that is different between the Pocket & Black? 

[Drew Fustini]

fyi - you may want to also post about this on the beaglelogic google group:
https://groups.google.com/forum/#!forum/beaglelogic

thanks,
drew

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[Roberts Maria]

--------------------------------------------
On Sat, 4/7/18, Drew Fustini <pdp7...@gmail.com> wrote:

Subject: Re: [beagleboard] BeagleLogic logic analyzer on PocketBeagle
To: "Beagle Board" <beagl...@googlegroups.com>
Cc: "Kumar Abhishek" <kumar.abhi...@gmail.com>
Date: Saturday, April 7, 2018, 5:39 AM

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area Unire din 1918 a incununat aspiratiile de veacuri ale romanilor de a vietui intr-un singur stat. Ea a fost rodul luptei tuturor fortelor si categoriilor sociale interne. De asemenea au contribuit la edificarea ei o generatie importanta de oameni politici precum: regele Ferdinand Ionel Bratianu luliu Maniu Ion Nistor Take lonescu Ion Inculet Nicolae lorga si multi altii. in noul cadru istoric de dupa anul 1918 s-a accelerat ritmul de dezvoltare si modernizare al societatii romanesti ceea ce a conferit trainicie statului national. Suprafata tarii a sporit de la 137 000 km2 la 295 049 km2 populatia de la'7 250 000 locuitori inainte de 1918 la 18 052 896 locuitori la recensamantul din 1930. Au marcat cresteri importante intre altele suprafata arabila-de la 6 6 milioane ha la 14 6 milioane ha suprafata acoperita cu paduri - de la 2 5 milioane ha la 7 3 milioane ha reteaua cailor ferate - de la 4300 km la 11 000 km. A avut loc integrarea deplina social-economica \ politica a noilor teritorii unite cu patria-mama un progres economic real si eficient aplicarea unui program democratic de propasire a tarii.

[v37...@gmail.com]

Hello,

did you make any progress or anything to share?  I use the beagle-logic on the BBB, but it could be interesting on the PB too.  Any website/blog or git?

cheers

[Kumar Abhishek]

All,

BeagleLogic, the software, will run on the PocketBeagle for sure, but the pins will be limited as only a very limited number of PRU1 pins (the pins marked pr1_pru_r31_xx) are broken out on the expansion headers. The way BeagleLogic works is that PRU1 samples the pins while PRU0 writes samples to RAM. Therefore the R31 of the PRU1 is the one it can read. Theoretically if one can tweak the firmware and the kernel driver, one could get it to sample the PRU0 pins instead, so you could have the PRU0 pins available.

I have designed a board prototype that converts the BeagleLogic to a standalone logic analyzer - https://theembeddedkitchen.net/announcing-beaglelogic-standalone/694 but is not released *yet*, although I do hope to make it available for sale in the near future. There's a link you can sign up to on the blog page, and I'll send you updates as and when it happens.

Thanks
Kumar Abhishek

[Randy Rossi]

Thanks for the info.  That explains a lot.  However, I see in the system reference manual for the pocket there are eight pr1_pru1_pru_r31_xxx pins.  Any idea why only 4 were working in my test?   Sounds like PRU1 should be able to see 8.

https://github.com/beagleboard/pocketbeagle/wiki/System-Reference-Manual#67_PRUICSS

[Charles Kerr]

from an overall cost perspective, for hobby needs, it would be great if a Pocketbeagle could be made that connects via USB to a host computer and does like a six/eight channel capture.  At 25 dollars for a pocket beagle, even if adding a cape for voltage protection, that seems like it would well less then a board based on the full fledge BeagleBone black (with ethernet, etc).   So if there a tweaks that could be made, it would a real advantage.

Charles

On Wednesday, April 11, 2018 at 12:25:40 PM UTC-4, Kumar Abhishek wrote: