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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
Just to let you know that I rebuilt Espruino from source, started from MDBT42Q board but removed LEDs etc and changed usart pins, flashed the result from gdb and now I have Espruino with serial console on usb data pins for further exploring :-) Also bluetooth works of course, console was default on bluetooth so I had to do Serial1.setConsole(false) over BLE connection first.
I figured out the pins first by dumping hw registers for USART,TWI,SPI in gdb, currently I know there is TWI2 scl 13 sda 14 ,SPI2 master sck 5 mosi 6 miso -1 (display?) and UART rx 22, tx 23. Time to go to sleep.
Anyway, I like that the USB data pins are connected, so one has two gpios or console without taking it apart. Not bad for $8 watch :-)