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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.
@MaBe
solved, broken homemade build, have been using a build that generated stars or snow instead of display text .....
After using a new build every thing is working as expected !
If you start building firmware you should add comment to your source to remember you which build you used for that code ....