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  1. Yes, those work fine in ISRs. Printing to...

    Yes, those work fine in ISRs.



    Printing to Serial (USB) within interrupts is dicey. The code isn't perfectly thread safe, so if you print in an ISR which interrupts the main program (or a...
  2. Teensy 3.x and LC have nested priority...

    Teensy 3.x and LC have nested priority interrupts, so the answer depends on the priority level of the other ISR.

    Priority numbers are 0 to 255, where lower numbers means higher priority. The...
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