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Trinket M0 no longer entering bootloader mode on Mac
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Trinket M0 no longer entering bootloader mode on Mac

by seefar on Thu Aug 15, 2019 12:10 pm

Hi,

I've tried to looking for past answers to this, but most of the similar posts/issues seem be for older Trinket boards.

I'm using –
  • Trinket M0
  • Mac
  • MakeCode

Here's what I'm experiencing –

  • On first use, I was able to mount the Trinket successfully in bootloader mode for MakeCode and add a program
  • When trying to re-mount the Trinket, to update the program, I can no longer get it to enter bootloader mode
    1. Connect to Mac
    2. Green LED lights up solid
    3. Press reset button once
    4. Red LED & Dotstar flash for several seconds
    5. Red LED & Dotstar turn off
    6. Green LED remains lit
  • I get the same behavior if I push the reset button twice
  • Have tried different USB ports and cables with same results
  • When the Trinket is hooked up to LEDs the earlier program runs successfully

Video – https://www.dropbox.com/s/twfz304iou2tnjt/IMG_8562.MOV?dl=0

Have I entered some sort of corrupt state for the bootloader, and is there a way to clear this?

Thanks!
Clayton

IMG_8563.jpg
IMG_8563.jpg (264.54 KiB) Viewed 76 times

seefar
 
Posts: 13
Joined: Fri Aug 02, 2019 4:34 pm

Re: Trinket M0 no longer entering bootloader mode on Mac

by adafruit_support_carter on Thu Aug 15, 2019 1:04 pm

Sounds like you've run into this issue:
https://learn.adafruit.com/adafruit-cir ... bootloader

That guide is specific to the CPX, but the issue can happen with any M0 based board using non-updated versions of the UF2 bootloader. So the same thing has probably happened to your Trinket.

I think unfortunately at this point you are in the situation where you will need to find another computer to use to update the bootloader.
https://learn.adafruit.com/adafruit-cir ... yboot-5-12

adafruit_support_carter
 
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Re: Trinket M0 no longer entering bootloader mode on Mac

by seefar on Thu Aug 15, 2019 1:25 pm

Thanks Carter.

Would the bootloader being out of date still be the issue even if it mounted successfully originally?

seefar
 
Posts: 13
Joined: Fri Aug 02, 2019 4:34 pm

Re: Trinket M0 no longer entering bootloader mode on Mac

by adafruit_support_carter on Thu Aug 15, 2019 2:14 pm

It would. The issue is very sneaky - it will work once, but then gets broken after the first MakeCode upload. And remains broken until the bootloader gets updated. And if your only PC is the one Mac, then you are sort of painted into a corner. Hopefully you can find another PC to use to perform the bootloader update.

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Joined: Tue Nov 29, 2016 2:45 pm

Re: Trinket M0 no longer entering bootloader mode on Mac

by seefar on Thu Aug 15, 2019 2:55 pm

Thanks Carter. I'll give that shot.

Anyone have a Windows machine? ;)

seefar
 
Posts: 13
Joined: Fri Aug 02, 2019 4:34 pm

Please be positive and constructive with your questions and comments.