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<h1>src/module/RFID.js <small>File</small></h1>
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<pre class="prettyprint linenums">
+(function (global, factory) {
if (typeof exports === 'undefined') {
factory(global.webduino || {});
} else {
module.exports = factory;
}
}(this, function (scope) {
'use strict';
var Module = scope.Module,
BoardEvent = scope.BoardEvent,
proto;
var RFIDEvent = {
/**
* Fires when the RFID entered.
*
* @event RFIDEvent.ENTER
*/
ENTER: 'enter',
/**
* Fires when the RFID leaved.
*
* @event RFIDEvent.LEAVE
*/
LEAVE: 'leave'
};
/**
* The RFID class.
*
* RFID reader is used to track nearby tags by wirelessly reading a tag's unique ID.
*
* @namespace webduino.module
* @class RFID
* @constructor
* @param {webduino.Board} board Board that the RFID is attached to.
* @extends webduino.Module
*/
function RFID(board) {
Module.call(this);
this._board = board;
this._isReading = false;
this._enterHandlers = [];
this._leaveHandlers = [];
this._messageHandler = onMessage.bind(this);
this._board.on(BoardEvent.BEFOREDISCONNECT, this.destroy.bind(this));
this._board.on(BoardEvent.ERROR, this.destroy.bind(this));
this._board.send([0xf0, 0x04, 0x0f, 0x00, 0xf7]);
}
function onMessage(event) {
var _this = this;
var msg = event.message;
var val;
if (!msg.length) {
return false;
}
if (msg.length === 1) {
_this._leaveHandlers.forEach(function (fn) {
fn.call(_this, val);
});
_this.emit(RFIDEvent.LEAVE, val);
val = null;
} else {
val = String.fromCharCode.apply(null, msg);
_this._enterHandlers.forEach(function (fn) {
fn.call(_this, val);
});
_this.emit(RFIDEvent.ENTER, val);
}
}
RFID.prototype = proto = Object.create(Module.prototype, {
constructor: {
value: RFID
},
/**
* The state indicating whether the module is reading.
*
* @attribute isReading
* @type {Boolean} isReading
* @readOnly
*/
isReading: {
get: function () {
return this._isReading;
}
}
});
/**
* Start reading RFID.
*
* @method read
* @param {Function} [enterHandler] Callback when RFID entered.
* @param {Function} [leaveHandler] Callback when RFID leaved.
*/
proto.read = function (enterHandler, leaveHandler) {
if (!this._isReading) {
this._board.send([0xf0, 0x04, 0x0f, 0x01, 0xf7]);
this._board.on(BoardEvent.SYSEX_MESSAGE, this._messageHandler);
this._isReading = true;
}
if (typeof enterHandler === 'function') {
this._enterHandlers.push(enterHandler);
}
if (typeof leaveHandler === 'function') {
this._leaveHandlers.push(leaveHandler);
}
};
/**
* Stop reading RFID.
*
* @method stopRead
*/
proto.stopRead = function () {
if (this._isReading) {
this._board.send([0xf0, 0x04, 0x0f, 0x02, 0xf7]);
this._board.removeListener(BoardEvent.SYSEX_MESSAGE, this._messageHandler);
this._isReading = false;
this._enterHandlers = [];
this._leaveHandlers = [];
}
};
/**
* Remove listener.
*
* @method off
* @param {String} evtType Type of event.
* @param {Function} handler Callback function.
*/
proto.off = function (evtType, handler) {
this.removeListener(evtType, handler);
};
/**
* Stop reading RFID and remove all listeners.
*
* @method destroy
*/
proto.destroy = function () {
this.stopRead();
this.removeAllListeners(RFIDEvent.ENTER);
this.removeAllListeners(RFIDEvent.LEAVE);
};
scope.module.RFIDEvent = RFIDEvent;
scope.module.RFID = RFID;
}));
</pre>
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