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.
 **/

// Sample Node-RED node file

// Require main module
var RED = require("../../red/red");
var HID = require('node-hid');
var device;
var node;

// The main node definition - most things happen in here
function DigiRGBNode(n) {
    // Create a RED node
    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");
   }
}

// Register the node by name. This must be called before overriding any of the
// Node functions.
RED.nodes.registerType("digiRGB",DigiRGBNode);


DigiRGBNode.prototype.close = function() {
    // Called when the node is shutdown - eg on redeploy.
    // Allows ports to be closed, connections dropped etc.
    // eg: this.client.disconnect();
    if (device) {
      device.close();
    }
}