6 ms·

I'm curious and couldn't find the info from a quick search of the repo, how much flash space does the JS virtual machine take up? And how much space is left to

I'm curious and couldn't find the info from a quick search of the repo, how much flash space does the JS virtual machine take up? And how much space is left to include libraries you may need? Between the Arduino runtime, wifi library, mqtt library, libraries for talking to peripherals, and my C++ application code I'm already getting pretty close to the 512KiB limit for an ESP8266-based thermostat I've been working on. Hard to imagine JS being small enough to fit on that, but perhaps it's designed for embedded chips with a bit more flash space available

thamer 5y ago
I can't speak for a JS virtual machine, but for a point of comparison CircuitPython[1] runs on many ESP32 boards and builds are often under 1.5 MB. It does come with a whole set of modules, with the ones you'd expect to have in Python like "re" or "time" (although they only have a few functions in there), but also with CircuitPython-specific modules like "board" or "digitalio" to access peripherals, or "wifi" for networking. The boards listed on the CircuitPython downloads page usually have between 2 and 8 MB of flash, so you often have enough for the VM and your own code plus a few files. [1] https://circuitpython.org/ https://circuitpython.org/
__ryan__ 5y ago
This makes use of a JS interpreter made for embedded devices: Espruino More details in the Espruino repo: https://github.com/espruino/Espruino https://github.com/espruino/Espruino
skittleson 5y ago
Devices memory vary in size https://en.wikipedia.org/wiki/ESP8266 https://en.wikipedia.org/wiki/ESP8266. Minification has been common with JS for years so it should be easy to add that in with the rollup.js build. Some checking be a nice to have.
Already__Taken 5y ago
Well, related to espruino as linked below. Having the VM does allow it to handle power and sleep states for you by the nature of the VM understanding the scheduling that's required.
scommab 5y ago
https://github.com/Moddable-OpenSource/moddable https://github.com/Moddable-OpenSource/moddable lets you do JS development targeting ESP8266/ESP32 .
- deleted 5y ago
  [deleted]

thamer 5y ago

I can't speak for a JS virtual machine, but for a point of comparison CircuitPython[1] runs on many ESP32 boards and builds are often under 1.5 MB. It does come with a whole set of modules, with the ones you'd expect to have in Python like "re" or "time" (although they only have a few functions in there), but also with CircuitPython-specific modules like "board" or "digitalio" to access peripherals, or "wifi" for networking. The boards listed on the CircuitPython downloads page usually have between 2 and 8 MB of flash, so you often have enough for the VM and your own code plus a few files. [1] https://circuitpython.org/ https://circuitpython.org/

__ryan__ 5y ago

This makes use of a JS interpreter made for embedded devices: Espruino More details in the Espruino repo: https://github.com/espruino/Espruino https://github.com/espruino/Espruino

skittleson 5y ago

Devices memory vary in size https://en.wikipedia.org/wiki/ESP8266 https://en.wikipedia.org/wiki/ESP8266. Minification has been common with JS for years so it should be easy to add that in with the rollup.js build. Some checking be a nice to have.

Already__Taken 5y ago

Well, related to espruino as linked below. Having the VM does allow it to handle power and sleep states for you by the nature of the VM understanding the scheduling that's required.

scommab 5y ago

https://github.com/Moddable-OpenSource/moddable https://github.com/Moddable-OpenSource/moddable lets you do JS development targeting ESP8266/ESP32 .

deleted 5y ago
[deleted]