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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.
@billsalt
Thanks @allObjects. I'll also be interested to hear what @Gordon has to say, but I'm guessing that is indeed my issue.
No, I'm not measuring. I want to use the pulse to trigger other operations (SPI bus transactions), but if you read earlier, it wasn't working so in the debugging I pared it down to the code shown so as to isolate the issue.
Appreciate your insights! I guess I was expecting that since the chip I'm using (nRF) would have no issues with normal interrupts of this style, then this should work.