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GPIO triggering during boot


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#1 Cohbra11

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Posted 19 September 2015 - 09:27 PM

I am looking for a solution to what seems to be the random firing of some/all of the GPIO while the system is booting up.  Almost all of my GPIO has relays attached to them, and having the relays come on during the booting process is not an acceptable option for me.  I've tried to search for a solution, but I haven't had any luck.  I did come across a link here in the forum for an update that supposedly fixed the issue, but it only directs me to the top level pcduino product page.  

 

Has anyone else found a solution for this?


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#2 cwilt

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Posted 19 September 2015 - 10:26 PM

Whatrelease are you running? I thought all released now started with GPIO low by default.



#3 Cohbra11

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Posted 19 September 2015 - 11:14 PM

It's the  pcduino3b_nano_dd_1404.img on a 3b

 

edit: I should mention that it is the 2-4-2015 release.



#4 Cohbra11

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Posted 20 September 2015 - 12:42 AM



#5 cwilt

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Posted 20 September 2015 - 01:16 AM

Its the pcDuino 3A that I was thinking of. Will send an email to developers.



#6 Cohbra11

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Posted 20 September 2015 - 02:22 AM

Thank you!



#7 LS-Support-12

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Posted 20 September 2015 - 12:38 PM

I am looking for a solution to what seems to be the random firing of some/all of the GPIO while the system is booting up...

Are other releases helpful to you?



#8 Cohbra11

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Posted 20 September 2015 - 04:42 PM

I haven't tried any of the others yet, but I would definitely prefer to use the latest 14.04 release.  


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#9 Cohbra11

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Posted 04 December 2015 - 04:19 AM

Has anyone heard of an update on this issue?



#10 nightseas

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Posted 05 December 2015 - 03:13 AM

It's a little tricky for processors like A20 on pcDuino to keep IO stable on boot up. The issue is related to initialization codes on both bootloader and kernal phases.

If adding external pull-up/down resistors on the pins don't work for your case, then you may have to modify the script.bin, which is a configuration file defined the default state of each IO, and even u-boot code.


Just a lazy rabbit~~





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