node-red-nodes/hardware/digiRGB/78-digiRGB.js

/**
 * Copyright 2013 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

module.exports = function(RED) {
    "use strict";
    var HID = require('node-hid');
    var device;
    var node;

    function DigiRGBNode(n) {
        RED.nodes.createNode(this,n);
        node=this;

        var devices = HID.devices(0x16c0,0x05df);
        for (var i=0; i< devices.length; i++) {
            if (devices[i].product == 'DigiUSB') {
                path = devices[i].path;
                node.log("found: " + path);
                try {
                    device = new HID.HID(devices[i].path);
                    break;
                } catch (e) {
                    node.log(e)
                }
            }
        }

        var p1 = /^\#[A-Fa-f0-9]{6}$/
        var p2 = /[0-9]+,[0-9]+,[0-9]+/

        if (device) {
            this.on("input", function(msg) {
                if (p1.test(msg.payload)) {
                    var r = parseInt(msg.payload.slice(1,3),16);
                    var g = parseInt(msg.payload.slice(3,5),16);
                    var b = parseInt(msg.payload.slice(5),16);
                    device.sendFeatureReport([115,r,g,b]);
                } else if (p2.test(msg.payload)) {
                    var args = msg.payload.split(',');
                    if (args.length == 3) {
                        device.sendFeatureReport([115,parseInt(args[0]),parseInt(args[1]),parseInt(args[2])]);
                    }
                } else {
                    node.warn("incompatable input - " + msg.payload);
                }
            });
        } else {
            node.warn("no digispark RGB found");
        }

        this.on('close', function() {
            if (device) { device.close(); }
        });
    }
    RED.nodes.registerType("digiRGB",DigiRGBNode);
}