The IDE is reporting multiple instances of COM3...and wont recognise devices, saying that the port is always open. I've been into Device Manager and cleared all the ports, plugged in my Trinket M0 again, but it won't upload it. and still says (currently) that I have six ports all called COM3.
I can boot the Trinket by resetting it with a double click, at which point it opens like a disk drive...but I think that for Circuit Python?
Any suggestions?
pert
July 7, 2019, 2:50am
2
It sounds like this bug:
opened 04:15AM - 05 May 19 UTC
closed 08:12AM - 18 Jul 19 UTC
Type: Bug
Type: Regression
Component: Uploading
Component: IDE Serial monitor
Arduino IDE Hourly Build 2019/04/18 12:33 / Arduino IDE 1.9.0-beta build 105, Wi… ndows 10 64 bit
1. Plug the USB cable of a native USB (Leonardo, MKR, Due (Native USB Port)) into your computer.
1. Tools > Serial Monitor
1. Unplug the USB cable.
1. Close Serial Monitor (to avoid https://github.com/arduino/Arduino/issues/8518 when using Arduino IDE 1.9.0-beta).
1. Plug the USB cable of the board into your computer. It doesn't matter whether this is done before or after closing Serial Monitor.
1. Sketch > Upload
The upload process completes successfully, but the Arduino IDE doesn't recognize this and after a delay the upload is shown to have failed with the error:
```
Couldn't find a Board on the selected port. Check that you have the correct port selected. If it is correct, try pressing the board's reset button after initiating the upload.
```
You must now exit the Arduino IDE and start it again before you can upload without the spurious failure.
When using Arduino IDE 1.8.9 or the Hourly Build, disconnecting the board while Serial Monitor is open and then reconnecting causes multiple duplicate ports to be shown in the **Tools > Port** menu. This does not occur with Arduino IDE 1.9.0-beta, but the spurious upload failure still does occur.
The duplicate ports and spurious upload failure issue does not occur with Arduino IDE 1.8.8.
Originally reported at:
- https://forum.arduino.cc/index.php?topic=613070
- https://forum.arduino.cc/index.php?topic=443558.msg4160634#msg4160634
Is the problem fixed when you restart the Arduino IDE?
Regrettably, no...
I've posted a screenshot in that thread you linked to...