Preface I am a complete beginner when it comes to these boards.
I'm stumped. I've been working on some code to get a 8x32 LED matrix display to function for a capstone project. I had the display CS (50), Din(51) and CLK(52) plugged into the board and power to the display going through a separate powered breadboard. As I was about to start testing some code the display starting acting up. I tried to reset the board and re upload the program. After a few of these it stopped recognizing the board. Now any time I plug the board in it states Unknown USB device (Device Descriptor Request Failed). When I push reset twice I can get to the boot loader and if I try to update it. When I drag the updater into the GCM4BOOT it closes and 4 lights turn on and stay that way. On is green, TX is yellow, RX is yellow and L is a flashing red. It will recognize the device while all the lights are on. If I try to update any of the code through Arduino IDE the yellow and red lights turn off and it stops being recognized and gives me the Unknown USB device error again. I've ordered another while I try to troubleshoot this one.
Grand Central M4 Unknown USB device
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- adafruit_support_carter
- Posts: 29189
- Joined: Tue Nov 29, 2016 2:45 pm
Re: Grand Central M4 Unknown USB device
For the sake of testing, is it possible to disconnect everything from the Grand Central? So it's just the USB cable.
What are the contents of the INFO_UF2.TXT file found in the GCM4BOOT folder?
What are the contents of the INFO_UF2.TXT file found in the GCM4BOOT folder?
- BleuMoo
- Posts: 4
- Joined: Wed May 03, 2023 10:56 pm
Re: Grand Central M4 Unknown USB device
After it gave me the unknown usb device error I disconnected everything but the micro usb connected to my computer. I tried several cables and 3 different computers. Same error. Below is what I get from the INFO_UF2.TXT.
UF2 Bootloader v3.15.0 SFHWRO
Model: Grand Central M4 Express
Board-ID: SAMD51P20A-GrandCentral-v0
UF2 Bootloader v3.15.0 SFHWRO
Model: Grand Central M4 Express
Board-ID: SAMD51P20A-GrandCentral-v0
- adafruit_support_carter
- Posts: 29189
- Joined: Tue Nov 29, 2016 2:45 pm
Re: Grand Central M4 Unknown USB device
Thanks. That looks OK.
While still in bootloader mode, try uploading a basic Blink Arduino sketch.
It sounds like maybe the currently loaded sketch is causing issues. So by manually entering bootloader mode, and uploading the Blink example, it will get the board back to a good state.
While still in bootloader mode, try uploading a basic Blink Arduino sketch.
It sounds like maybe the currently loaded sketch is causing issues. So by manually entering bootloader mode, and uploading the Blink example, it will get the board back to a good state.
- BleuMoo
- Posts: 4
- Joined: Wed May 03, 2023 10:56 pm
Re: Grand Central M4 Unknown USB device
The code is the problem. All fixed! Thanks!
Last edited by BleuMoo on Thu May 04, 2023 4:05 pm, edited 1 time in total.
- adafruit_support_carter
- Posts: 29189
- Joined: Tue Nov 29, 2016 2:45 pm
Re: Grand Central M4 Unknown USB device
Having a sketch interfere like that can just happen sometimes, for various reasons. Hopefully you'll be able to trace through and figure it out. You've got a way to recover now at least.
- BleuMoo
- Posts: 4
- Joined: Wed May 03, 2023 10:56 pm
Re: Grand Central M4 Unknown USB device
Got it working again. Thanks!
Please be positive and constructive with your questions and comments.