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.
 **/

var RED = require(process.env.NODE_RED_HOME+"/red/red");
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 (msg != null) {
            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);