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Thread: Teensy 3.2 : Error opening serial port 'COMx' (Port busy).

  1. #26
    Senior Member+ KurtE's Avatar
    Join Date
    Jan 2014
    Sorry, I have no idea how that IDE works. I would assume that it would only use the COM port when it is open, but...

    Sometimes when things are not working well, I try a few other tricks to see if it helps. Like go to device manager, and find your comm port. Go into advanced options and change what COm port number it is.

    Then try rebooting and see if it works on the new comm port number...

  2. #27
    Senior Member
    Join Date
    Dec 2016
    Montreal, Canada
    try to disable usb hub power management in device manager for all your hubs, this solved latest win10 updates issues with my teensy

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