Power Profiler Kit tremendous delay, what's going on?

RE: Power Profiler Kit tremendous delay, what's going on?

Davide — Mon, 23 Oct 2017 07:47:10 GMT

Thank you wilhelmsen, by stopping the Trigger window the Average window works as expected, without delay.

Anyway I don't convert your comment into an answer because this actually do not solve the problem, the Average window works but I can't use the Trigger. Thank you anyway!

RE: Power Profiler Kit tremendous delay, what's going on?

wlgrd — Mon, 23 Oct 2017 07:18:38 GMT

Davide; to me it got perfect (switching between external and dk measurement shows up instantaneous), but I know people are struggling if using hubs and older machines. Can you make sure to use a proper cable directly to your computer? No docking stations or the like. Also, can you post some hardware specs for your computer?

Also, as the user guide says; don't run trigger at the same time as average if you want the average to be your main focus. It causes some package drops as well as some delay for some people.

RE: Power Profiler Kit tremendous delay, what's going on?

erltot — Fri, 20 Oct 2017 10:46:08 GMT

It's better for me too. I am using windows 7 btw

RE: Power Profiler Kit tremendous delay, what's going on?

Davide — Fri, 20 Oct 2017 08:52:03 GMT

It seems to be a little bit better (the 2 sec window is filled in almost 3 sec) but it is still not in real time.

RE: Power Profiler Kit tremendous delay, what's going on?

wlgrd — Fri, 20 Oct 2017 07:38:27 GMT

I think it is because of the logging module introduced in 1.1.0.

Can you try commenting out line 196 of ppk.py;

# plotter.start_log_thread()

This was primarily tested on Windows 7, which seemed to have handled it fine, but not on Windows 10 and Linux.

RE: Power Profiler Kit tremendous delay, what's going on?

Davide — Thu, 19 Oct 2017 14:26:20 GMT

It is not an issue of my firmware nor the PPK hardware. It is an issue related to the Python script or libraries because with the old version (1.0.0) of the script the PPK works as expected.

RE: Power Profiler Kit tremendous delay, what's going on?

MartinBL — Thu, 19 Oct 2017 13:05:57 GMT

Ok, so do you think it's an issue with the PPK or your firmware? If the latter, do you mind uploading your firmware too?

RE: Power Profiler Kit tremendous delay, what's going on?

Davide — Thu, 19 Oct 2017 12:34:07 GMT

I don't think its a bandwidth problem because there is no missing data. If it was bandwidth issue at some point the buffer in the PPK or in the debugger would be full filled. Instead it seems that the data is correctly transferred to the PC, but the GUI reads it at slower speed. And I don't think it is an hardware problem because I tested this PPK board one month ago and everything was working (but with the previous sw release).

EDIT: by using the SW 1.0.0 (only the GUI, you do not need to upload a new firmware) everything is works as expected.

RE: Power Profiler Kit tremendous delay, what's going on?

erltot — Thu, 19 Oct 2017 12:29:27 GMT

I have the same experience from having tried two different PPK boards. It might be USB bandwidth problem? It seems it slows down further the longer you log

RE: Power Profiler Kit tremendous delay, what's going on?

MartinBL — Thu, 19 Oct 2017 09:04:48 GMT

Hi,

There might be some lag when you use a wide average window. I think 4 seconds should be fine though.

What is your system details? OS, etc.
Can you edit your question and add a screenshot of what you see?