Teensy 4.1 Not Working With M2 Mac

O

oliverrsachs

New member
I am in a digital electronics class and have not been able to get my Arduino to connect to my Teensy. The Arduino program itself isn't working on my M2 Mac so I have been trying to use Teensyduino, which works all the way up until the point of compiling. Then I get the error message "Opening Teensy Loader... Unable find Teensy Loader. (p) Is the Teensy Loader application running? quitexit status 1", even though the teensy loader does open. Anyone have any help with this?
 
Rezo said:
I have an M2 Pro running TD 1.8.19 without an issue
Click to expand...
and when you try to send code from the laptop to the teensy you don't get that error? strange, id like to see what your settings look like to connect the teensy to the arduino. maybe I missed a step or unchecked a box.
 
Is this a brand new Teensy 4.1 that has never been programmed?

If so, try doing a verify command in the IDE with some real simple program like the blink example.

When it finishes compiling and the Teensy app is opened up. Then go to the teensy and press the program button.
Does it then program the teensy. After this, assuming you previously build a sketch with a USB type that includes some form of Serial
(Either normal Serial or Serial emulation), then the next builds should be able to automatically be able to program your Teensy
without having to push the button.
 
oliverrsachs said:
Then I get the error message "Opening Teensy Loader... Unable find Teensy Loader. (p) Is the Teensy Loader application running? quitexit status 1", even though the teensy loader does open. Anyone have any help with this?
Click to expand...

First, make sure you're running the latest Teensyduino version. For the old IDE on MacOS, click Teensyduino > About to check the version. (on Windows and Linux the same thing is done by clicking Help > About)

One of the recent MacOS versions changed stuff. Sorry, I don't recall which one. But I do know this problem happens if you have an older Teensyduino version (1.59 is the latest) previously installed and then you update MacOS. There was also a problem with older Teensyduino on newer MacOS where Teensy Loader wouldn't automatically start, again due to Apple making subtle system changes, but a workaround was found so it works with latest 1.59 version.

This might also be due to a restrictive security setting. I know we've had a few of those with recent MacOS, but the ones that I recall where things like access to Documents folder. If you do not allow, then stuff fails until you go into Settings > Security and find Arduino or Teensyduino and allow access. But I don't recall this specific issue (which is really about inter-process communication using localhost networking) on recent MacOS with latest Teensyduino. It has come up a few times with people having misconfigured Linux systems, and long ago used to be common on Windows when people installed lame security software like Zone Alarm.
 
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