TinyJS on mbed. TinyJS is very simple JavaScript engine.
TinyJS on mbed
what's this ?
TinyJS is an extremely simple (under than 2000 lines) JavaScript interpreter engine.
I ported on mbed. but it restrict any features.
TinyJS project is https://github.com/gfwilliams/tiny-js
TinyJSは2000行以下で書かれた非常に小さいJavaScriptインタプリタエンジンです。
これをmbedに移植してみました。(ただし、いろいろ制限があります)
本家はこちら。 https://github.com/gfwilliams/tiny-js
how to use
You must use on serial terminal application by mbed serial USB.
baud is 57600bps
USBシリアルとして、ターミナルソフトを接続するとコンソールが表示されます。
ボーレートは57600bpsになってます。
functions
functions for mbed.
mbed用関数
- mbed.DigitalIn(pinName, mode)
- mbed.DigitalOut(pinName, val)
- mbed.AnalogIn(pinName)
- mbed.AnalogOut(pinName, val)
- mbed.InterruptIn(pinName, edge, mode, callback)
- mbed.TimerStart()
- mbed.TimerStop()
- mbed.TimerReset()
- mbed.TimerRead()
- mbed.Timeout(callback, t)
- mbed.wait(s)
- mbed.memfree()
sample JavaScript codes
DigitalOut
mbed.DigitalOut('LED1', 1); mbed.DigitalOut('LED2', 0); mbed.DigitalOut('LED3', 1); mbed.DigitalOut('LED4', 0);
LED1 = On, LED2=Off, LED3=On, ED4=Off
LED1 = 点灯、LED2=消灯、LED3=点灯、LED4=消灯
DigitalIn
print(mbed.DigitalIn('p5', 'PullUp'));
p5 is pull up, read, and print on console.
p5をPullUpして読みプリントする。
AnalogOut
mbed.AnalogOut('p18', 0.8);
p18 is analog output, value is 0.8.
p18を 値0.8でアナログ出力する。
AnalogIn
print(mbed.AnalogIn('p20'));
p20 is read analog voltage, and print on console.
p20をアナログ入力しプリントする。
InterruptIn
var led1 = 0; mbed.InterruptIn('p5', 'fall', 'PullUp', function() {led1 = !led1; mbed.DigitalOut('LED1', led1);});
Interrupt on p5, and ON/OFF does LED1.
p5で割り込んでLED1をON/OFFする。
Timeout and wait sample code
mbed.Timeout(function() {mbed.DigitalOut('LED1', 1);mbed.wait(3);mbed.DigitalOut('LED1', 0);}, 4);
LED1=on when wait for 4 seconds. and LED1=off for 3 seconds later.
LED1を4秒待って点灯して3秒後に消灯する。
memfree
print(mbed.memfree());
This prints the number of bytes of the remainder memory on mbed where TinyJS is usable.
これはTinyJSが使えるmbed上での残りメモリのバイト数をプリントアウトする。
LED Blinker by Timeout
blinker = function() {var led = 0; mbed.Timeout(function() {led = !led; mbed.DigitalOut('LED1', led);blinker();}, 0.5);}; blinker();
LED Blinker by Timeout.
Timeoutを使ったLチカ。
restrictions
- There is very little available memory. (Less than 9kbytes on LPC1768)
- Registration of InterruptIn is 4 limit.
- The loop to 8,192 times.
- The built-in functions (general JavaScript functions) that TinyJS prepares for for securing of memory is not included.
more, more, more ....
制限事項
- 利用できるメモリは非常に少ない。(LPC1768で9kbytes以下)
- InterruptInで登録できる割り込みは4つまで。4つを超えると1つめから順番に削除される。
- ループは8192回まで。
- メモリ確保のためTinyJSが用意している組み込み関数(一般的なJavaScript関数)は含まれない。
他、多数....
sample movies
http://www.youtube.com/watch?v=ARp0DK70JGM
http://www.youtube.com/watch?v=UOZQ4eEC4xA
Script.cpp
- Committer:
- ohneta
- Date:
- 2014-01-20
- Revision:
- 8:819934a27c2d
- Parent:
- 3:f56c36ea8266
File content as of revision 8:819934a27c2d:
/* * TinyJS * * A single-file Javascript-alike engine * * Authored By Gordon Williams <gw@pur3.co.uk> * * Copyright (C) 2009 Pur3 Ltd * * Permission is hereby granted, free of charge, to any person obtaining a copy of * this software and associated documentation files (the "Software"), to deal in * the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies * of the Software, and to permit persons to whom the Software is furnished to do * so, subject to the following conditions: * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ /* * This is a simple program showing how to use TinyJS */ /* * TinyJS for mbed. * * Authored by Takehisa Oneta (ohneta@gmail.com) * 10th Jan. 2013 */ #include "TinyJS.h" #include "TinyJS_Functions.h" #ifdef MBED #include "Mbed_Functions.h" #endif #include <assert.h> #include <stdio.h> //const char *code = "var a = 5; if (a==5) a=4; else a=3;"; //const char *code = "{ var a = 4; var b = 1; while (a>0) { b = b * 2; a = a - 1; } var c = 5; }"; //const char *code = "{ var b = 1; for (var i=0;i<4;i=i+1) b = b * 2; }"; const char *code = "function myfunc(x, y) { return x + y; } var a = myfunc(1,2); print(a);"; void js_print(CScriptVar *v, void *userdata) { printf("> %s\n", v->getParameter("text")->getString().c_str()); } void js_dump(CScriptVar *v, void *userdata) { CTinyJS *js = (CTinyJS*)userdata; js->root->trace("> "); } #ifndef MBED int main(int argc, char **argv) { CTinyJS *js = new CTinyJS(); /* add the functions from TinyJS_Functions.cpp */ registerFunctions(js); /* Add a native function */ js->addNative("function print(text)", &js_print, 0); js->addNative("function dump()", &js_dump, js); /* Execute out bit of code - we could call 'evaluate' here if we wanted something returned */ try { js->execute("var lets_quit = 0; function quit() { lets_quit = 1; }"); js->execute("print(\"Interactive mode... Type quit(); to exit, or print(...); to print something, or dump() to dump the symbol table!\");"); } catch (CScriptException *e) { printf("ERROR: %s\n", e->text.c_str()); } while (js->evaluate("lets_quit") == "0") { char buffer[2048]; fgets ( buffer, sizeof(buffer), stdin ); try { js->execute(buffer); } catch (CScriptException *e) { printf("ERROR: %s\n", e->text.c_str()); } } delete js; #ifdef _WIN32 #ifdef _DEBUG _CrtDumpMemoryLeaks(); #endif #endif return 0; } #else int mbedErrorFlag; std::string mbedErrorMessage; extern int readOneLine(char *buffer, const int bufferSize); int tinyjs_main(int argc, char **argv) { CTinyJS *js = new CTinyJS(); //registerFunctions(js); js->addNative("function print(text)", &js_print, 0); js->addNative("function dump()", &js_dump, js); js->execute("var lets_quit = 0; function quit() { lets_quit = 1; }"); js->execute("print(\"Interactive mode... Type quit(); to exit, or print(...); to print something, or dump() to dump the symbol table!\");"); // add mbed functions registerMbedFunctions(js); while (js->evaluate("lets_quit") == "0") { char buffer[2048]; int len = readOneLine(buffer, 2048); { mbedErrorFlag = 0; js->execute(buffer); if (mbedErrorFlag != 0) { printf("ERROR: %s\n", mbedErrorMessage.c_str()); } } } delete js; #ifdef _WIN32 #ifdef _DEBUG _CrtDumpMemoryLeaks(); #endif #endif return 0; } #endif