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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.
@rj
OK, I think I got to the heart of the problem, SPI1 is working beautifully (I haven't tested with the SX library and all that, but I get data through MOSI now).
Apparantly capacitors on the AI Thinker ESP32-A1S prevents us from using GPIOs 5, 18, 19 and 23 for SPI (according to this comment (Edit: may be incorrect, the comment is referring to a dev. kit using the same chip)).
Thank you MaBe for your help!
Edit: still having issues, posting a new question 🙂