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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.
@Snerkle
I've tried software SPI and the result is much the same. Its slower in in the first instance for each write, not as bad as half the speed of the best hardware SPI rate I can get. However it suffers delays of the same length (~0.2 sec) as in the log above with similar frequency and these delays do block the serial interrupts the same way as for hardware SPI.