Standard advice on ISRs from the forums often includes one or more of the following: avoid putting too much inside an ISR - keep them lean and mean simply set a flag of some kind in the ISR, then poll that flag in the main loop and do the bulk of any processing required there dont use function cal…

Interrupt heresy - reactions?

nickgammon September 22, 2012, 2:21am 5

Flashing LEDs are perfectly acceptable

The time intervals are so short that using a logic analyzer might be advisable rather than trying to spot an LED flash.

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