Has a regression snuck in to the PPK stack?

RE: Has a regression snuck in to the PPK stack?

AHaug — Tue, 02 Jul 2024 07:30:54 GMT

Hi,

Here's an update letting you know that the PPK2 team is looking into the issue, but that they will need some more time to verify if new firmware resolves the issue.

Edit: Hopefully the new release that should come during this summer will not have this issue.

Kind regards,
Andreas

RE: Has a regression snuck in to the PPK stack?

benjamin-eub — Sun, 30 Jun 2024 13:23:39 GMT

And I should note that the customer that observed the same impossible numbers was running on Intel...

RE: Has a regression snuck in to the PPK stack?

benjamin-eub — Sun, 30 Jun 2024 13:21:05 GMT

I do not sadly, just an observation from some guy at the Zephyr Discord. He said the same thing as you however - this was only observable on certain USB ports and not at all on others.

RE: Has a regression snuck in to the PPK stack?

Achim Kraus — Fri, 28 Jun 2024 14:24:05 GMT

[quote userid="123704" url="~/f/nordic-q-a/112571/has-a-regression-snuck-in-to-the-ppk-stack/491324"]AMD chipset bug[/quote]

Hm ... my experience may also point in that direction. If I plug the PPK II direct to the PC, the numbers sometime doesn't make sense. If I plug it in the USB-Hub of my KMV-switch, the numbers are better.

Do you have some more details about that AMD chipset bug?

RE: Has a regression snuck in to the PPK stack?

benjamin-eub — Fri, 28 Jun 2024 12:18:26 GMT

Note: someone at the Zephyr Discord hinted at an AMD chipset bug could've caused this?? Sounds absolutely insane, but I DO run AMD...

RE: Has a regression snuck in to the PPK stack?

AHaug — Fri, 28 Jun 2024 12:03:22 GMT

Hi,

I've piped this query to the PPK team for investigation. I will check in with them and you next week for a status w.r.t the bug investigation.

Thank you for reporting this, I'll get back to you!

Kind regards;
Andreas

RE: Has a regression snuck in to the PPK stack?

benjamin-eub — Fri, 28 Jun 2024 10:58:37 GMT

Note: turns out the method of Joulescope + PPK in parallel introduced too much noise for the results to be reliable. But I stand by my observations.