• thanks, got it, so LRCK goes nowhere but must be used to enable i2s and some clock is produced there. Then it is indeed not a good idea to connect this to reset pin :-)

    So there are couple of pins not connected at all on 52840 dongle, one is P0.16 on the picture posted above.

    just tried D16 on dongle clone (E104-BT5040U) and writing 1 or 0 does nothing, reading gives true by default and false when configured as D16.mode("input_pulldown"), so I guess the pin is floating. D23.write(0) reboots to bootloader indeed


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