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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.
@ConorONeill
This is the code I use for an ESP32 with MAX7219. Relevant init code at the end.
https://github.com/conoro/im-on-a-call-ble/blob/master/light_esp32.js