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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.
@SergeP
By the way, usual issue with DMA-controlled serial communications is that CS line is goes back to inactive state too early, when last byte is sent to DMA subsystem or to shift register, not waiting for it is fully goes out of system. I have seen that even in some hardware USARTs.