Question on how Bangle 2 watch from a firmware's perspective

Posted on Sat 21st, October 2023

• #1

user156811

Question one

https://github.com/espruino/Espruino/blob/master/boards/BANGLEJS2.py

So here is the list of configurations for the Bangle 2. I'm just wondering were are the actual drivers for this located at. For example there's this line "'device' : 'CST816S'". So there must be a CST816S c class somewhere right?

Question Two

Where's the code to handle the the Bangle 2 OS watch. The Espruino.js is just a runtime to make javascript work on the embedded device. So i'm guessing there's also a repo for the code for the watch right?

This is a very cool project. Just trying to figure out how it works :)
• #2

user156811

So even the hardware drivers are in javascript?

https://www.espruino.com/modules/ST7735.js
• #3

user140377

Try https://github.com/espruino/Espruino/blob/master/libs/banglejs/jswrap_bangle.c
• #4

Gordon

A lot of the simple drivers for hardware are actually in the jswrap_bangle.c file linked above - which handles most bangle-related stuff, like the Bangle JS class. Graphics/HRM drivers are elsewhere.

Some JS (for menus, prompts) is in Espruino/libs/js but a lot of the OS logic is written in JS in the BangleApps repo: https://github.com/espruino/BangleApps

Specifically the boot and settings apps which are always loaded onto the watch

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