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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
I know about it, not sure how it could help me in this case. I am trying to do it directly on the device on the fly as the data is already there. More helpful is this https://github.com/espruino/Espruino/blob/master/scripts/create_custom_font.js but still I didn't get what is correct format from that code.
The page http://www.espruino.com/Fonts#custom-fonts says "You'll need a string containing a column-first, most significant bit first, 1 bit per pixel bitmap" which is still not enough for me to understand. Also when looking at font sources like https://github.com/espruino/Espruino/blob/master/libs/graphics/bitmap_font_6x8.c it looks like the data is in rows, not columns.