I've found something interesting in https://github.com/espruino/Espruino/blob/master/libs/banglejs/jswrap_bangle.c
ifdef BANGLEJS_Q3 ... define GPS_UART EV_SERIAL1 ... /*JSON{ "type" : "EV_SERIAL1", "generate" : "jswrap_banglejs_gps_character", "#if" : "defined(BANGLEJS_F18) || defined(DTNO1_F5) || defined(BANGLEJS_Q3)" }*/ bool jswrap_banglejs_gps_character(char ch) { ...
Maybe that's what you are looking for.
@HilmarSt started
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.
I've found something interesting in https://github.com/espruino/Espruino/blob/master/libs/banglejs/jswrap_bangle.c
Maybe that's what you are looking for.