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Itsy Bitsy M0 Fails to Enter Bootloader Mode
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Itsy Bitsy M0 Fails to Enter Bootloader Mode

by jorrojj on Mon May 17, 2021 2:46 pm

I recently bought a new Itsy Bitsy M0 through Digikey for some prototyping, but when connecting the device over USB to my Windows 10 PC and double clicking the reset button, the dot star does not turn on as expected. Here's what I've tried so far:

    Connecting an Itsy Bitsy 32u4 on the same USB cable to confirm it's a sync capable cable: works
    Checking if device shows up on Device Manager or as disk drive: doesn't work
    Probing 5V and 3.3V rails: 5.1V & 3.295V
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itsybitsym0_nodrive.JPG
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jorrojj
 
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Re: Itsy Bitsy M0 Fails to Enter Bootloader Mode

by adafruit_support_mike on Mon May 17, 2021 10:38 pm

First, verify your USB cable by using it to connect some other, known-working device to the computer. There's a plague of charge-only cables out there with USB connectors at both ends, but no wires for the data signals.

Just swapping cables has no diagnostic value. It's normal for people to say they had to try three or four cables before they found one that worked. You need the true positive of a working USB connection to rule out the false negative of a charge-only cable.

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Re: Itsy Bitsy M0 Fails to Enter Bootloader Mode

by jorrojj on Tue May 18, 2021 12:59 pm

Connecting an Itsy Bitsy 32u4 on the same USB cable to confirm it's a sync capable cable: works


Hi Mike,

I mentioned on the original post that I used the SAME USB cable on an Itsy Bitsy 32u4 and it worked. I've already confirmed it's NOT a charge-only cable.

Best,

jorrojj
 
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Re: Itsy Bitsy M0 Fails to Enter Bootloader Mode

by adafruit_support_mike on Tue May 18, 2021 6:27 pm

Does anything happen when you double-click the reset button?

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Re: Itsy Bitsy M0 Fails to Enter Bootloader Mode

by jorrojj on Wed May 19, 2021 2:32 pm

Nothing happens when i double click the reset button: the dotstar doesn't turn on, nor I hear the Microsoft sound from mounting serial device.

jorrojj
 
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Re: Itsy Bitsy M0 Fails to Enter Bootloader Mode

by adafruit_support_mike on Sun May 23, 2021 6:16 pm

Thank you. Combined with the supply voltages and the lack of response from a reset means there's probably something wrong with the microcontroller's USB hardware.

Send a note containing a link to this page and your order number to support@adafruit.com. The folks there will get you a replacement.

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Please be positive and constructive with your questions and comments.