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-   -   Reading log files of current (http://www.chiefdelphi.com/forums/showthread.php?t=135166)

thrashercharged 25-02-2015 08:11
Reading log files of current
 
We're able to monitor PDP current and log it (have 2015 DS, roboRIO and PDP with latest firmware (Rev 1.4 from http://crosstheroadelectronics.com/control_system.html) with CAN connected between them) and we see the log file created when the robot is disabled following an enabled period. This log file is in C:\Users\Public\Documents\FRC\Log Files with the extension .pdplog. Problem is, we're having trouble finding a way to read the file? Is there a reader we need to download?

Mark McLeod 25-02-2015 08:16
Re: Reading log files of current
 
The reader for the .pdplog hasn't been released yet.

Pratik Kunapuli 25-02-2015 08:16
Re: Reading log files of current
 
Quote:
Originally Posted by thrashercharged (Post 1449589)
We're able to monitor PDP current and log it (have 2015 DS, roboRIO and PDP with latest firmware (Rev 1.4 from http://crosstheroadelectronics.com/control_system.html) with CAN connected between them) and we see the log file created when the robot is disabled following an enabled period. This log file is in C:\Users\Public\Documents\FRC\Log Files with the extension .pdplog. Problem is, we're having trouble finding a way to read the file? Is there a reader we need to download?
If you instantiate a PowerDistributionPanel object (I know you can do this in Java and C++, but I don't know about Labview), you can access the current of individual channels as well as the total current in real time.

thrashercharged 25-02-2015 08:43
Re: Reading log files of current
 
Quote:
Originally Posted by Mark McLeod (Post 1449591)
The reader for the .pdplog hasn't been released yet.

Well that's a bummer. I thought the ability to log current was one of the big marketing points about this new roboRIO and PDP?

[quote]If you instantiate a PowerDistributionPanel object ... you can access the current of individual channels as well as the total current in real time. /QUOTE]

We use labview - our programmer's able to display the individual currents in real time - didn't know we could display total current? I'd considered asking him to sum all the individual together or something like that and display the sum but if there's an easier way that's inherent to labview - can anyone advise on that?

Looking at instantaneous current values is better than nothing, but it'll really be nice to be able to look at a log after the fact. Any advice?

amreuland 25-02-2015 09:01
Re: Reading log files of current
 
You might consider saving the current values to your own log file every couple second or milliseconds. Probably best to use a csv or tab delimited format, then you could put it into a spreadsheet program and possibly graph the data there.

fovea1959 25-02-2015 09:08
Re: Reading log files of current
 
have your programmers read the current during the match and write a file on the roboRIO?

virtuald 25-02-2015 10:54
Re: Reading log files of current
 
Quote:
Originally Posted by thrashercharged (Post 1449595)
Well that's a bummer. I thought the ability to log current was one of the big marketing points about this new roboRIO and PDP?
My understanding is that the log viewer will be released after week 1.

Ether 25-02-2015 11:02
Re: Reading log files of current
 
Quote:
Originally Posted by Mark McLeod (Post 1449591)
The reader for the .pdplog hasn't been released yet.
Has the spec for the .pdplog file format been released?

Ether 04-03-2015 15:21
Re: Reading log files of current
 
Quote:
Originally Posted by Ether (Post 1449650)
Has the spec for the .pdplog file format been released?
Is the file human-readable?

Jared 04-03-2015 15:29
Re: Reading log files of current
 
Quote:
Originally Posted by Ether (Post 1453496)
Is the file human-readable?
It would appear that it isn't, but I haven't tried too much.
Here's a link to one of ours https://drive.google.com/file/d/0Bzf...ew?usp=sharing


Can logging be disabled? It's quite useless as it is now, and we end up in a bad state if we enable and disable quickly, which I believe is the log file being sent over.

Alan Anderson 04-03-2015 15:36
Re: Reading log files of current
 
Quote:
Originally Posted by Jared (Post 1453504)
Can logging be disabled? It's quite useless as it is now, and we end up in a bad state if we enable and disable quickly, which I believe is the log file being sent over.
The PDP firmware update (1.40) addresses this bug.

Ether 04-03-2015 15:45
Re: Reading log files of current
 
Quote:
Originally Posted by Jared (Post 1453504)
It would appear that it isn't...
Uh yeah. Here's all the text extracted:

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AF AG AH AI AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY AZ Aa Ab Ac Ad Ae
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engunneer 04-03-2015 22:57
Re: Reading log files of current
 
For fun, I started reverse engineering the file to see what I can see. Here's a snippet of the file displayed as hex:

(exported from frhed, and trimming off the first 0x14 bytes on a hunch (I think it's the header))

Code: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 see two different kinds of record here. The first 4 bytes looks like a timestamp to me (reverse the byteorder (little-endian))
018ab94b
019da94c
01b0a94d

I've also been looking for floating point numbers (put a 4 byte likely candidate into an IEEE-754 calculator to see if it's a meaningful number).
My guess is that it's recording low resolution data quickly, or it's higher resolution data very quickly and they are multiplexing the current sensing.

I'm still trying to make sense of it. It would be super helpful to have a file from a robot under known conditions. Something like
Code:
power up
disabled for 30s
start teleop, but do nothing for 10s
run a motor on channel 1 forward and back in 5s intervals for 30s
run a motor on channel 2 forward for 5s
ch3 for 5s, etc
disabled
power off
I'll poke for a little while longer and maybe try to get a file off the robot at comp, but I probably won't have it decoded by the time a viewer is released.

I know the OP wasn't looking for a research project, but this is an interesting type of problem that can be solved with a little testing.


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