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isochronic
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Joined: 21/01/2012
Location: Australia
Posts: 689

Posted: 01:31am 21 Jun 2018

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I'm stumped..
I have got logging to an auxiliary SD card running fine, it is writing
1 or 2 meg files by slow increments second by second, no worries.
But it shows up a problem - overnight the parent system (pic32mx128b)
is apparently restarting sometimes, at random times.
The power is from batteries with no mains or USB connected and should be clean as.
The reset pin is tied high via a reset resistor circuit/button; if I manually reset it it goes to a prompt as it is supposed to do.
Some random time after a few hours, a restart occurs and the variables etc reinitialise, but it does not go back to the user prompt.
I thought it may be a memory leak in my program, but it happens at random and sometimes not at all.

WTF ??????

Maybe I have to shield all the wiring :(.
Any ideas welcome.

Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9751

Posted: 01:42am 21 Jun 2018

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The 128 runs a very old version of MMBASIC now. Have you tried a 170 chip in it's place? Unfortunately, I doubt you will get that much support for the poor old 128 chip now.

I am prepared to be corrected on that though!

Smoke makes things work. When the smoke gets out, it stops!

Azure

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Joined: 09/11/2017
Location: Australia
Posts: 446

Posted: 02:13am 21 Jun 2018

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I am not familiar with the PIC32MX128, what version of MMBasic did it run and what was the system called?

isochronic
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Joined: 21/01/2012
Location: Australia
Posts: 689

Posted: 03:00am 21 Jun 2018

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errgh ! sorry that should have been pic32mx170b .. ie pretty standard.
Not running MMBasic, just my own programs.
It is probably a bug somehow but ... why the random timing ?

OA47

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Joined: 11/04/2012
Location: Australia
Posts: 1013

Posted: 03:02am 21 Jun 2018

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Chronic, a couple of years ago I was chasing a similar issue with the MX128 that was resetting randomly. The problem turned out to be an occasional higher level on the analog input (>3V3) which caused the reset. Not sure what your set up is...�
OA47

isochronic
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Joined: 21/01/2012
Location: Australia
Posts: 689

Posted: 03:11am 21 Jun 2018

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OA47-
Excellento !!! that makes perfect sense, I will nail things down a bit,
Thanks

Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3308

Posted: 08:19am 21 Jun 2018

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The capacitor on Vcap has also caused random resets. Preferably it should be a ceramic with a high quality dielectric.

Geoff Graham - http://geoffg.net

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