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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.
@Gordon
Yes, it would eliminate the branch but I think in real terms that may not make a noticeable difference.
The debugger isn't something I provide - you'd just have to wire up an nRF52832DK board. 3 wires basically, but you do have to pull back the LCD so it's not ideal if you plan on putting the watch back together again :)
https://www.espruino.com/Bangle.js+Technical - there's a link to Macronix MX25 which seems to be a similar chip. I believe pretty much all SPI flash are driven the same way though