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microphone: JavaScript example for Grove microphone

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Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Sarah Knepper <sarah.knepper@intel.com>
This commit is contained in:
Zion Orent 2015-01-07 13:39:17 -05:00 committed by Sarah Knepper
parent 0ef81a3b1c
commit 2a8bbb0b8c
2 changed files with 67 additions and 0 deletions
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61
examples/javascript/mic.js Normal file
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/*jslint node:true, vars:true, bitwise:true, unparam:true */
/*jshint unused:true */
/*global */
/*
* Author: Zion Orent <zorent@ics.com>
* Copyright (c) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
var upmMicrophone = require("jsupm_mic");
// Attach microphone to analog port A0
var myMic = new upmMicrophone.Microphone(0);
var threshContext = new upmMicrophone.thresholdContext;
threshContext.averageReading = 0;
threshContext.runningAverage = 0;
threshContext.averagedOver = 2;
var is_running = false;
// Infinite loop, ends when script is cancelled
// Repeatedly, take a sample every 2 microseconds;
// find the average of 128 samples; and
// print a running graph of the averages
while(1)
{
var buffer = new upmMicrophone.uint16Array(128);
var len = myMic.getSampledWindow(2, 128, buffer);
if (len)
{
var thresh = myMic.findThreshold(threshContext, 30, buffer, len);
myMic.printGraph(threshContext);
if (thresh)
console.log("Threshold is " + thresh);
}
}
// Print message when exiting
process.on('SIGINT', function()
{
console.log("Exiting...");
process.exit(0);
});

6
src/mic/jsupm_mic.i
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%include "../upm.i"
%include "../carrays_uint16_t.i"
%typemap(in) uint16_t * {
void *argp = 0 ;
int res = SWIG_ConvertPtr($input, &argp,SWIGTYPE_p_uint16Array, 0 | 0 );
$1 = (uint16_t *)(argp);
}
%{
#include "mic.h"
%}