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JavaScript scripting engine Arduino IDE Library for ESP8266

ESP8266-Arduino-JavaScript is a Arduino IDE Library to implement a JavaScript engine for ESP8266 microcontroller.

• Download the latest github release zip fileESP8266-Arduino-JavaScript-0.0.12
• In the Arduino IDE, navigate to Sketch > Include Library > Add .ZIP Library. At the top of the drop down list, select the option to "Add .ZIP Library''.
• You will be prompted to select the library you would like to add. Navigate to the .zip file's location and open it.
• Load the demo sketch using the Arduino IDE menu (File->Examples->ESP8266-Arduino-JavaScript->blink)
• Build and Upload.

• Clean ISO C, ISO C++. Builds on old (VC98) and modern compilers, from 8-bit (e.g. Arduino mini) to 64-bit systems
• No dependencies
• Implements a restricted subset of ES6 with limitations
• Preallocates all necessary memory and never callsmalloc,reallocat run time. Upon OOM, the VM is halted
• Object pool, property pool, and string pool sizes are defined at compile time
• The minimal configuration takes only a few hundred bytes of RAM
• RAM usage: an object takes 6 bytes, each property: 16 bytes,a string: length + 6 bytes, any other type: 4 bytes
• Strings are byte strings, not Unicode.For example,'ы'.length === 2,'ы'[0] === '\xd1','ы'[1] === '\x8b'
• Limitations: max string length is 256 bytes, numbers hold32-bit float value, no standard JS library
• mJS VM executes JS source directly, no AST/bytecode is generated
• Simple FFI API to inject existing C functions into JS

#include<mjs3.h>externvoidmyDelay(int x) {delay(x);}externvoidmyDigitalWrite(int x,int y) {digitalWrite(x, y);}voidsetup() {pinMode(16, OUTPUT);// Initialize the LED_BUILTIN pin as an outputstructmjs *vm =mjs_create();// Create JS instancemjs_ffi(vm,"delay", (cfn_t) myDelay,"vi");// Import delay()mjs_ffi(vm,"write", (cfn_t) myDigitalWrite,"vii");// Import write()mjs_eval(vm,"while (1) { write(16, 0); delay(500); write(16, 1); delay(500); }", -1);}voidloop() {//delay(1000);}

Sketch uses 271568 bytes (26%) of program storage space. Maximum is 1044464 bytes.Global variables use 27828 bytes (33%) of dynamic memory, leaving 54092 bytes for local variables. Maximum is 81920 bytes.

Dual license: GPLv2 or commercial. For commerciallicensing, please contactsupport@mongoose-os.com