teensy serial port problem Win 11

L

leonid

Member
I've installed Adruino/Teensy on Win11 (I tried v1.8.19/1.58 and v2.3.2) and in both combinations have a problem with serial port recognition. When compiled I choose "Tools/Ports/Teensy ports/COM9 Serial (Teensy 3.6)", although the compiler complains that "Teensy should be selected from "teensy ports" rather than "Serial ports" in Arduino's Tools > Port menu". In device manager I can see COM9 with "USB Serial device" (not Teensy), and NI MAX (Labview) does not see that port at all. Device manager shows usbser.sys driver connected to this port. On another computer with Win10, where Teensy is properly recognized, Dev manager shows two drivers: usbser.sys and serenum.sys. De-installing and reinstalling Adruino/Teensy did not help. Any suggestions on how to fix the driver issue?
 
Connect your teensy 3.6 to the PC with Windows 11.

Press the reset button for about 15 seconds.

You will see that the red LED will start flashing. It is a reset that deletes the recent program in memory and leaves it with the factory program
 
Thanks for the reply. I followed the instructions, it looks like the program is erased but the factory one is not restored (no LED flashing after 15+ min, not recognized as a serial interface either). After erasing the memory and re-compiling the program the errors are the same (the board is not recognized as a proper Teensy serial). I want to note that the same configuration works under Win 10 on another computer, it more looks like a Win11 configuration issue I cannot figure out.
 
Generally, not had problems since Win 11.
Search forum for tycommander - that is most often used SerMon program here and generaly provides better connectivity and feedback.

Is this really a T_3.6? or is it a T_4.x being misidentified?

On a T_3.6 there is no Red LED bootloader feedback LED for timing the 15 second Restore after pressing/holding the Program Button.
 
And on T_3.6 there is no factory program after 15s holding of program button only empty flash and for programming you need to press the program button again (IIRC)
 
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