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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
@Gordon and @allObjects: solved! I used a J-K flip flop (74AC109) inline configured as a toggle. Then changed the setWatch to edge: 'both'. Pretty simple hardware solution.
Doing my SPI transfers in the setWatch with enough time, helps confirm that the issue was the narrow pulse.