For others, this is now reported in the Espruino bug tracker: https://github.com/espruino/Espruino/issues/1866
Espruino was originally only designed with ASCII in mind, so this doesn't work with char codes >127
It shouldn't be too hard to fix, and for now you could actually overwrite String.prototype.toUpperCase with a JS version if you need it in a hurry
String.prototype.toUpperCase
@Gordon 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.
For others, this is now reported in the Espruino bug tracker: https://github.com/espruino/Espruino/issues/1866
Espruino was originally only designed with ASCII in mind, so this doesn't work with char codes >127
It shouldn't be too hard to fix, and for now you could actually overwrite
String.prototype.toUpperCase
with a JS version if you need it in a hurry