123 lines
3.0 KiB
JavaScript
123 lines
3.0 KiB
JavaScript
/*
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* device
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* cylonjs.com
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*
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* Copyright (c) 2013-2014 The Hybrid Group
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* Licensed under the Apache 2.0 license.
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*/
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'use strict';
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var EventEmitter = require('events').EventEmitter;
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var Logger = require('./logger'),
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Utils = require('./utils');
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// Public: Creates a new Device
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//
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// opts - object containing Device params
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// name - string name of the device
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// pin - string pin of the device
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// robot - parent Robot to the device
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// connection - connection to the device
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// driver - string name of the module the device driver logic lives in
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//
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// Returns a new Device
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var Device = module.exports = function Device(opts) {
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if (opts == null) {
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opts = {};
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}
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this.halt = Utils.bind(this.halt, this);
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this.start = Utils.bind(this.start, this);
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this.robot = opts.robot;
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this.name = opts.name;
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this.pin = opts.pin;
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this.connection = this.determineConnection(opts.connection) || this.defaultConnection();
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this.driver = this.initDriver(opts);
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Utils.proxyFunctionsToObject(this.driver.commands, this.driver, this);
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};
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Utils.subclass(Device, EventEmitter);
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// Public: Starts the device driver
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//
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// callback - callback function to be executed by the driver start
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//
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// Returns result of supplied callback
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Device.prototype.start = function(callback) {
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var msg = "Starting device '" + this.name + "'";
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if (this.pin != null) {
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msg += " on pin " + this.pin;
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}
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msg += ".";
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Logger.info(msg);
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return this.driver.start(callback);
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};
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// Public: Halt the device driver
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//
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// callback - function to trigger when the device has been halted
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//
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// Returns result of supplied callback
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Device.prototype.halt = function(callback) {
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Logger.info("Halting device '" + this.name + "'.");
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this.driver.halt(callback);
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};
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// Public: Expresses the Device in JSON format
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//
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// Returns an Object containing Connection data
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Device.prototype.toJSON = function() {
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return {
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name: this.name,
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driver: this.driver.constructor.name || this.driver.name,
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pin: this.pin,
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connection: this.connection.toJSON(),
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commands: this.driver.commands
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};
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};
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// Public: Retrieves the connections from the parent Robot instances
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//
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// conn - name of the connection to fetch
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//
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// Returns a Connection instance
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Device.prototype.determineConnection = function(conn) {
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return this.robot.connections[conn];
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};
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// Public: Returns a default Connection to use
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//
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// Returns a Connection instance
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Device.prototype.defaultConnection = function() {
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var first = 0;
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for (var c in this.robot.connections) {
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var connection = this.robot.connections[c];
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first || (first = connection);
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}
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return first;
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};
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// Public: sets up driver with @robot
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//
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// opts - object containing options when initializing driver
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// driver - name of the driver to intt()
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//
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// Returns the set-up driver
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Device.prototype.initDriver = function(opts) {
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if (opts == null) {
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opts = {};
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}
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Logger.debug("Loading driver '" + opts.driver + "'.");
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return this.robot.initDriver(opts.driver, this, opts);
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};
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