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Can't enter bootloader mode on GEMMA v2
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Please be positive and constructive with your questions and comments.

Can't enter bootloader mode on GEMMA v2

by fungineersma on Wed Oct 27, 2021 4:59 pm

When I power the GEMMA by USB (I've tried 5 different cables now), there's just a pulsating rainbow of colors on the onboard rgb. Pressing the reset button causes the red button to flash quickly for a fraction of a second and then back to the rainbow flashing.

fungineersma
 
Posts: 2
Joined: Wed Oct 27, 2021 4:57 pm

Re: Can't enter bootloader mode on GEMMA v2

by dastels on Wed Oct 27, 2021 6:23 pm

The rainbow flashing is most likely a CircuitPython error code. What is output in the REPL?

If you aren't familiar with using the REPL (or even just the serial connection), see
https://learn.adafruit.com/welcome-to-circuitpython/kattni-connecting-to-the-serial-console
https://learn.adafruit.com/welcome-to-circuitpython/interacting-with-the-serial-console
https://learn.adafruit.com/welcome-to-circuitpython/the-repl

Double-pressing reset should put you in bootloader mode and mount the GEMMABOOT drive.

Dave

dastels
 
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Joined: Tue Oct 20, 2015 3:22 pm

Re: Can't enter bootloader mode on GEMMA v2

by fungineersma on Wed Oct 27, 2021 7:08 pm

Double clicking the reset did the trick, thank you.

fungineersma
 
Posts: 2
Joined: Wed Oct 27, 2021 4:57 pm

Please be positive and constructive with your questions and comments.