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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
I'm pretty sure A9 is fine once you start to write to it with
digitalWrite.However because of the STM32F1, it gets interesting if you try and use it for a 'peripheral' that's not GPIO :) The F4 in the Pico has a much better arrangement and won't suffer from those kinds of issues...