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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
Yes, if it's not coming back your best bet is to use the debugger (or to add loads of jsiConsolePrint statements).
If you're up for it, the ideal solution would be to use
jshSPISetupandjshSPISendfunctions though - and then filesystem would work on any platform that normal SPI was supported on.