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Problems connecting to Metro Express M0 via USB
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Please be positive and constructive with your questions and comments.

Problems connecting to Metro Express M0 via USB

by pwf1960 on Fri Feb 15, 2019 4:18 pm

I recently purchased 3 Metro Express M0 (PID 3505) boards for a project. I can connect and upload sketches to two of them from both my MacBook and PC development platforms. The third board, seems to be running the blink example sketch (at least the onboard LED labelled R is blinking steadily, unless I'm attempting a reset or upload), and when I connect it, is reported to be COM19 on the PC (the Macbook never seems to see it), I upload a sketch, the LEDs seem to blink appropriately, but I get this error:
Arduino: 1.8.7 (Windows 7), Board: "Adafruit Metro M0 Express"

Sketch uses 12504 bytes (4%) of program storage space. Maximum is 262144 bytes.
No device found on COM19
An error occurred while uploading the sketch

And it resumes blinking the onboard LED. The onboard NeoPixel never lights in the manner the two siblings do, and I am using the exact same wiring setup for all three devices.

Is there a way to persuade this device to work, or am I simply out of luck?

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Re: Problems connecting to Metro Express M0 via USB

by adafruit_support_carter on Fri Feb 15, 2019 4:22 pm

Try double pressing reset to get it into bootloader mode. You should see a METROBOOT folder show up. Try uploading to it in that mode and see if behaves better.

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Re: Problems connecting to Metro Express M0 via USB

by pwf1960 on Fri Feb 15, 2019 5:21 pm

I tried the double reset tap, and observed no discernible effect. This device seems to reset really fast (or is that an illusion?)
And to be clear, when I attempt an upload, the yellow RX/TX lights blink and it behaves like its getting the sketch. Just doesn't seem to actually
be doing the reset/boot/load properly.
Got any other suggestions?

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Re: Problems connecting to Metro Express M0 via USB

by adafruit_support_carter on Fri Feb 15, 2019 5:27 pm

The timing of the double press can be a little tricky. Try using one of the other boards to verify you can get it to show up. They should all do the same thing with the double reset press.

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Re: Problems connecting to Metro Express M0 via USB

by pwf1960 on Wed Feb 20, 2019 2:38 pm

Got the METROBOOT to appear with one of the working boards. Same double tap reset on the problem board doesn't produce anything other than a brief reset blink.
Was away for the long weekend, now back . Sorry for the delay.

pwf1960
 
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Re: Problems connecting to Metro Express M0 via USB

by adafruit_support_carter on Wed Feb 20, 2019 3:53 pm

Thanks. So may something is up with that one board. It sounds like the PC at least sees something when you connect it:
and when I connect it, is reported to be COM19 on the PC

Can you post a screen shot of what it shows up as in Device Manager.

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Re: Problems connecting to Metro Express M0 via USB

by pwf1960 on Wed Feb 20, 2019 4:29 pm

The non-working board appears in Device Manager as a UART interface:
Non-workingMetroM0.pdf
Screen shot of Device Manager with non-working Metro M0 Express attached to PC
(148.27 KiB) Downloaded 7 times

The working board appears in Device Manager as the Arduino controller:
WorkingMetroM0.pdf
Screen shot of Device Manager with working Metro M0 Express attached
(144.48 KiB) Downloaded 6 times


Thanks for reminding me to look in Device Manager, I had been focused on whether or not a COM port appeared.

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Re: Problems connecting to Metro Express M0 via USB

by adafruit_support_carter on Wed Feb 20, 2019 4:35 pm

I think your non-working board is not a Metro M0 Express. If device manager is seeing a CP210x, then it might be a PID 2488:
https://www.adafruit.com/product/2488

Can you check that. Look for "express" printed on the front.
express.jpg
express.jpg (40.03 KiB) Viewed 107 times

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Re: Problems connecting to Metro Express M0 via USB

by pwf1960 on Wed Feb 20, 2019 4:56 pm

you are correct, of course....guess there was a mixup in shipping.
The non-working board is indeed not an express.
Changed the board, and now I am working with the former delinquent.

I suppose I am okay now that I have a working part. Sorry for my "seeing what I expected" blindness.

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Re: Problems connecting to Metro Express M0 via USB

by pwf1960 on Wed Feb 20, 2019 5:09 pm

Still having issues getting my MacBook Pro (runnng Mojave) platform to recognize it consistently, but that seems to be a horse of a different color and I don't think I need to clutter up this thread with that...

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Re: Problems connecting to Metro Express M0 via USB

by adafruit_support_carter on Wed Feb 20, 2019 5:12 pm

If this was a shipping mix up, we should fix it and send you what you ordered. Do you still have your order number?

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Re: Problems connecting to Metro Express M0 via USB

by pwf1960 on Wed Feb 20, 2019 9:49 pm

It was order number 1963780.

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Please be positive and constructive with your questions and comments.