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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.
@allObjects
...to finish @Spocki 's comment
relative to the baud rate SPI is set up.
In @Gordon 's fall back sulution (see post #2): 3200000. Because: 3200000 / 4 = 800kHz as specified to be the max speed (of today) neopixel strings can be driven.
See data sheets:
Surprisingly - or not - the timing specs do not match exactly... but most of the time stay within each other's tolerances...: