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Metro M4 Grand Central rebooting every 13 sec.
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Metro M4 Grand Central rebooting every 13 sec.

by hnaseri on Mon Apr 26, 2021 3:07 pm

I programmed my board with bootloader-grandcentral_m4-v3.13.0.bin bootloader and the board reboots every 13 seconds or so. It seems some registers get corrupted after rebooting.
(1) Is there an updated bootloader that does not have this bug?
(2) Where can I get the correct fuse register values for my device?

Thank you,
Hamid

hnaseri
 
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Re: Metro M4 Grand Central rebooting every 13 sec.

by mikeysklar on Wed Apr 28, 2021 3:35 pm

Hamid,

How did you update the bootloader? I see you mentioned the BIN file format so you were not using the drag and drop UF2 file, but maybe a command line utility to upload it?

This bootloader has been around for months so I'm thinking you might have another issue. Is there anything connected to your grandcentral? Were you running Arduino or CircuitPython?

Here is the link to the previous January release of 3.12 feel you must roll back a release.

https://github.com/adafruit/uf2-samdx1/ ... tag/3.12.0

mikeysklar
 
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Re: Metro M4 Grand Central rebooting every 13 sec.

by danhalbert on Tue May 04, 2021 11:09 am

I was able to help hnaseri in discord. The fuses were set wrong and made the watchdog timer go on. The fuses were rewritten, but they do not completely take effect until the board is power-cycled. After that was done everything was fine.

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Please be positive and constructive with your questions and comments.