1/*jslint node:true, vars:true, bitwise:true, unparam:true */
2/*jshint unused:true */
3/*global */
4/*
5* Author: Zion Orent <zorent@ics.com>
6* Copyright (c) 2014 Intel Corporation.
7*
8* Permission is hereby granted, free of charge, to any person obtaining
9* a copy of this software and associated documentation files (the
10* "Software"), to deal in the Software without restriction, including
11* without limitation the rights to use, copy, modify, merge, publish,
12* distribute, sublicense, and/or sell copies of the Software, and to
13* permit persons to whom the Software is furnished to do so, subject to
14* the following conditions:
15*
16* The above copyright notice and this permission notice shall be
17* included in all copies or substantial portions of the Software.
18*
19* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
23* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
24* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26*/
27
28var upmMicrophone = require("jsupm_mic");
29
30// Attach microphone to analog port A0
31var myMic = new upmMicrophone.Microphone(0);
32
33var threshContext = new upmMicrophone.thresholdContext;
34threshContext.averageReading = 0;
35threshContext.runningAverage = 0;
36threshContext.averagedOver = 2;
37
38var is_running = false;
39// Infinite loop, ends when script is cancelled
40// Repeatedly, take a sample every 2 microseconds;
41// find the average of 128 samples; and
42// print a running graph of the averages
43while(1)
44{
45    var buffer = new upmMicrophone.uint16Array(128);
46    var len = myMic.getSampledWindow(2, 128, buffer);
47    if (len)
48    {
49        var thresh = myMic.findThreshold(threshContext, 30, buffer, len);
50        myMic.printGraph(threshContext);
51        if (thresh)
52            console.log("Threshold is " + thresh);
53    }
54}
55
56// Print message when exiting
57process.on('SIGINT', function()
58{
59	console.log("Exiting...");
60	process.exit(0);
61});
62