Teensy4 IntervalTimer Channels Problem

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@Quadrupel - where did you insert the startup patch in startup.c - that is a VERY busy file - don't want to break it. Also - I'm keeping a copy of the original..

I stuck it in the resetHandler function.
Because, I don't like modifying core files, and until there's a production fix to IntervalTimer, I'm putting the fix into the beginning of setup(). It works, and the appropriate comments identify why it's included in the code.
 
Paul fixed in startup.c of Teensyduino 1.48 beta 1

Thanks for the update. I took a look at the change in startup.c. Interesting that it was PIT channel three causing the problem.

Update: i was looking at a file showing changes only and it didn't show the entire fix. I see the fix is actually your entire recommendation.
 
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