TinyJS on mbed. TinyJS is very simple JavaScript engine.

Dependencies:   mbed

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

Committer:
ohneta
Date:
Mon Jan 20 00:07:35 2014 +0000
Revision:
8:819934a27c2d
Parent:
3:f56c36ea8266
update InterruptIn, Timer, Timeout functons

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ohneta 0:aae260bdcdd9 1 /*
ohneta 0:aae260bdcdd9 2 * TinyJS
ohneta 0:aae260bdcdd9 3 *
ohneta 0:aae260bdcdd9 4 * A single-file Javascript-alike engine
ohneta 0:aae260bdcdd9 5 *
ohneta 0:aae260bdcdd9 6 * Authored By Gordon Williams <gw@pur3.co.uk>
ohneta 0:aae260bdcdd9 7 *
ohneta 0:aae260bdcdd9 8 * Copyright (C) 2009 Pur3 Ltd
ohneta 0:aae260bdcdd9 9 *
ohneta 0:aae260bdcdd9 10 * Permission is hereby granted, free of charge, to any person obtaining a copy of
ohneta 0:aae260bdcdd9 11 * this software and associated documentation files (the "Software"), to deal in
ohneta 0:aae260bdcdd9 12 * the Software without restriction, including without limitation the rights to
ohneta 0:aae260bdcdd9 13 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
ohneta 0:aae260bdcdd9 14 * of the Software, and to permit persons to whom the Software is furnished to do
ohneta 0:aae260bdcdd9 15 * so, subject to the following conditions:
ohneta 0:aae260bdcdd9 16
ohneta 0:aae260bdcdd9 17 * The above copyright notice and this permission notice shall be included in all
ohneta 0:aae260bdcdd9 18 * copies or substantial portions of the Software.
ohneta 0:aae260bdcdd9 19
ohneta 0:aae260bdcdd9 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
ohneta 0:aae260bdcdd9 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
ohneta 0:aae260bdcdd9 22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
ohneta 0:aae260bdcdd9 23 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
ohneta 0:aae260bdcdd9 24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
ohneta 0:aae260bdcdd9 25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
ohneta 0:aae260bdcdd9 26 * SOFTWARE.
ohneta 0:aae260bdcdd9 27 */
ohneta 0:aae260bdcdd9 28
ohneta 0:aae260bdcdd9 29 /*
ohneta 0:aae260bdcdd9 30 * This is a simple program showing how to use TinyJS
ohneta 0:aae260bdcdd9 31 */
ohneta 0:aae260bdcdd9 32
ohneta 0:aae260bdcdd9 33 /*
ohneta 0:aae260bdcdd9 34 * TinyJS for mbed.
ohneta 0:aae260bdcdd9 35 *
ohneta 0:aae260bdcdd9 36 * Authored by Takehisa Oneta (ohneta@gmail.com)
ohneta 0:aae260bdcdd9 37 * 10th Jan. 2013
ohneta 0:aae260bdcdd9 38 */
ohneta 0:aae260bdcdd9 39 #include "TinyJS.h"
ohneta 0:aae260bdcdd9 40 #include "TinyJS_Functions.h"
ohneta 3:f56c36ea8266 41 #ifdef MBED
ohneta 3:f56c36ea8266 42 #include "Mbed_Functions.h"
ohneta 3:f56c36ea8266 43 #endif
ohneta 3:f56c36ea8266 44
ohneta 0:aae260bdcdd9 45 #include <assert.h>
ohneta 0:aae260bdcdd9 46 #include <stdio.h>
ohneta 0:aae260bdcdd9 47
ohneta 0:aae260bdcdd9 48 //const char *code = "var a = 5; if (a==5) a=4; else a=3;";
ohneta 0:aae260bdcdd9 49 //const char *code = "{ var a = 4; var b = 1; while (a>0) { b = b * 2; a = a - 1; } var c = 5; }";
ohneta 0:aae260bdcdd9 50 //const char *code = "{ var b = 1; for (var i=0;i<4;i=i+1) b = b * 2; }";
ohneta 0:aae260bdcdd9 51 const char *code = "function myfunc(x, y) { return x + y; } var a = myfunc(1,2); print(a);";
ohneta 0:aae260bdcdd9 52
ohneta 0:aae260bdcdd9 53 void js_print(CScriptVar *v, void *userdata) {
ohneta 0:aae260bdcdd9 54 printf("> %s\n", v->getParameter("text")->getString().c_str());
ohneta 0:aae260bdcdd9 55 }
ohneta 0:aae260bdcdd9 56
ohneta 0:aae260bdcdd9 57 void js_dump(CScriptVar *v, void *userdata) {
ohneta 0:aae260bdcdd9 58 CTinyJS *js = (CTinyJS*)userdata;
ohneta 0:aae260bdcdd9 59 js->root->trace("> ");
ohneta 0:aae260bdcdd9 60 }
ohneta 0:aae260bdcdd9 61
ohneta 0:aae260bdcdd9 62 #ifndef MBED
ohneta 0:aae260bdcdd9 63 int main(int argc, char **argv)
ohneta 0:aae260bdcdd9 64 {
ohneta 0:aae260bdcdd9 65 CTinyJS *js = new CTinyJS();
ohneta 0:aae260bdcdd9 66 /* add the functions from TinyJS_Functions.cpp */
ohneta 0:aae260bdcdd9 67 registerFunctions(js);
ohneta 0:aae260bdcdd9 68 /* Add a native function */
ohneta 0:aae260bdcdd9 69 js->addNative("function print(text)", &js_print, 0);
ohneta 0:aae260bdcdd9 70 js->addNative("function dump()", &js_dump, js);
ohneta 0:aae260bdcdd9 71 /* Execute out bit of code - we could call 'evaluate' here if
ohneta 0:aae260bdcdd9 72 we wanted something returned */
ohneta 0:aae260bdcdd9 73 try {
ohneta 0:aae260bdcdd9 74 js->execute("var lets_quit = 0; function quit() { lets_quit = 1; }");
ohneta 0:aae260bdcdd9 75 js->execute("print(\"Interactive mode... Type quit(); to exit, or print(...); to print something, or dump() to dump the symbol table!\");");
ohneta 0:aae260bdcdd9 76 } catch (CScriptException *e) {
ohneta 0:aae260bdcdd9 77 printf("ERROR: %s\n", e->text.c_str());
ohneta 0:aae260bdcdd9 78 }
ohneta 0:aae260bdcdd9 79
ohneta 0:aae260bdcdd9 80 while (js->evaluate("lets_quit") == "0") {
ohneta 0:aae260bdcdd9 81 char buffer[2048];
ohneta 0:aae260bdcdd9 82 fgets ( buffer, sizeof(buffer), stdin );
ohneta 0:aae260bdcdd9 83 try {
ohneta 0:aae260bdcdd9 84 js->execute(buffer);
ohneta 0:aae260bdcdd9 85 } catch (CScriptException *e) {
ohneta 0:aae260bdcdd9 86 printf("ERROR: %s\n", e->text.c_str());
ohneta 0:aae260bdcdd9 87 }
ohneta 0:aae260bdcdd9 88 }
ohneta 0:aae260bdcdd9 89 delete js;
ohneta 0:aae260bdcdd9 90 #ifdef _WIN32
ohneta 0:aae260bdcdd9 91 #ifdef _DEBUG
ohneta 0:aae260bdcdd9 92 _CrtDumpMemoryLeaks();
ohneta 0:aae260bdcdd9 93 #endif
ohneta 0:aae260bdcdd9 94 #endif
ohneta 0:aae260bdcdd9 95 return 0;
ohneta 0:aae260bdcdd9 96 }
ohneta 0:aae260bdcdd9 97 #else
ohneta 0:aae260bdcdd9 98
ohneta 0:aae260bdcdd9 99 int mbedErrorFlag;
ohneta 0:aae260bdcdd9 100 std::string mbedErrorMessage;
ohneta 0:aae260bdcdd9 101
ohneta 0:aae260bdcdd9 102 extern int readOneLine(char *buffer, const int bufferSize);
ohneta 0:aae260bdcdd9 103
ohneta 0:aae260bdcdd9 104 int tinyjs_main(int argc, char **argv)
ohneta 0:aae260bdcdd9 105 {
ohneta 0:aae260bdcdd9 106 CTinyJS *js = new CTinyJS();
ohneta 0:aae260bdcdd9 107 //registerFunctions(js);
ohneta 0:aae260bdcdd9 108
ohneta 0:aae260bdcdd9 109 js->addNative("function print(text)", &js_print, 0);
ohneta 0:aae260bdcdd9 110 js->addNative("function dump()", &js_dump, js);
ohneta 0:aae260bdcdd9 111
ohneta 0:aae260bdcdd9 112 js->execute("var lets_quit = 0; function quit() { lets_quit = 1; }");
ohneta 0:aae260bdcdd9 113 js->execute("print(\"Interactive mode... Type quit(); to exit, or print(...); to print something, or dump() to dump the symbol table!\");");
ohneta 0:aae260bdcdd9 114
ohneta 0:aae260bdcdd9 115 // add mbed functions
ohneta 3:f56c36ea8266 116 registerMbedFunctions(js);
ohneta 3:f56c36ea8266 117
ohneta 0:aae260bdcdd9 118
ohneta 0:aae260bdcdd9 119 while (js->evaluate("lets_quit") == "0") {
ohneta 0:aae260bdcdd9 120 char buffer[2048];
ohneta 0:aae260bdcdd9 121 int len = readOneLine(buffer, 2048);
ohneta 0:aae260bdcdd9 122 {
ohneta 0:aae260bdcdd9 123 mbedErrorFlag = 0;
ohneta 0:aae260bdcdd9 124 js->execute(buffer);
ohneta 0:aae260bdcdd9 125 if (mbedErrorFlag != 0) {
ohneta 0:aae260bdcdd9 126 printf("ERROR: %s\n", mbedErrorMessage.c_str());
ohneta 0:aae260bdcdd9 127 }
ohneta 0:aae260bdcdd9 128 }
ohneta 0:aae260bdcdd9 129 }
ohneta 0:aae260bdcdd9 130 delete js;
ohneta 0:aae260bdcdd9 131
ohneta 0:aae260bdcdd9 132 #ifdef _WIN32
ohneta 0:aae260bdcdd9 133 #ifdef _DEBUG
ohneta 0:aae260bdcdd9 134 _CrtDumpMemoryLeaks();
ohneta 0:aae260bdcdd9 135 #endif
ohneta 0:aae260bdcdd9 136 #endif
ohneta 0:aae260bdcdd9 137 return 0;
ohneta 0:aae260bdcdd9 138 }
ohneta 0:aae260bdcdd9 139 #endif