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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Yes, it'd be handy if you could keep it running then...
Basically there are a few counters, and a lot of calculations are done in the SysTick IRQ. Those need to be fast, so they all use integers.
If it happens to roll over at intervals of say, 32768 - then it gives be a clear idea of where the error might be occurring.