Bizarre behavior between ISR and loop()

[ScruffR]

I think this one deals with the same

Sporadic value from micros()

Hey everyone, Just starting with a Photon. I am trying to measure pulse times via a low triggered interrupt. I think it’s a pretty simple handler. I started getting occasional random errors, and began storing the micros() values into an array, so when I got a bad value I could print the timings. The bit errors come in different places, but each time it appears there is a reading with an extra 1ms, and the next delta is negative because the reading gets back on track. Time jumping ahead leads m…