Espruino Emulator

Espruino JavaScript interpreter for microcontollers, running in the browser

Gordon Williams

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Description

Ever wanted to try developing some software for hardware, but don't have the hardware handy? This allows you to use the same Espruino IDE that you'd use to program real devices, but to run a complete instance of the Espruino interpreter (which would usually run on the microcontroller) inside the web browser and communicate with it just like you would real hardware.

Try it here:https://www.espruino.com/ide/emulator.html?codeurl=https://raw.githubusercontent.com/espruino/BangleApps/master/apps/blobclk/clock-blob.js

Click 'upload' in the middle of the screen to start the VM and upload the code to it. This is emulating a VM with a 240x240 screen, running https://banglejs.com/ code

Details

Currently this emulates a JS interpreter with Graphics, and 2500 vars storage - similar to Bangle.js

There's some stuff that would be really neat though:

Support for emulating different types of board
Robot support! We could have a WebGL virtual world and an emulated robot controlled by the emulated Espruino

Very basic digital IO is done - you can play t-rex now! https://www.espruino.com/ide/emulator.html?codeurl=https://raw.githubusercontent.com/espruino/BangleApps/master/apps/trex/trex.js - so actually hooking on to this to do robots should be relatively easy

Build Instructions

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Building

Ensure you have Emscripten installed: https://emscripten.org/docs/getting_started/downloads.html

git clone https://github.com/espruino/EspruinoWebIDE
git clone https://github.com/espruino/Espruino
cd Espruino
BOARD=EMSCRIPTEN RELEASE=1 make
mv emulator_espruino.js ../EspruinoWebIDE/js/plugins/emulator_espruino.js

Then open EspruinoWebIDE/emulator.html in a web browser

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