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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.
@fanoush
there is also unused SPI2 interface, if you are really going for speed, that could be even faster. spi is already compiled in so it should not enlarge code size as the driver code is already there. or it can be even written without using nordic drivers, without using interrupts it is just writing RXD,TXD registers and polling ready flag, this would be similar style to current bitbanging way but could be even shorter (and faster)