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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.
MaBe
@fanoush
not sure if it is related or there already is fix in espruino code for this issue but there is known bug when sending and receiving one byte over nrf52 spi with DMA, see https://devzone.nordicsemi.com/f/nordic-q-a/16401/sending-single-bytes-over-hw-spi-0xff-appended-every-other-time with link to workaround zip with source or see directly https://infocenter.nordicsemi.com/topic/errata_nRF52832_Rev2/ERR/nRF52832/Rev2/latest/anomaly_832_58.html?cp=4_2_1_0_1_8 for issue described