1/*jslint node:true, vars:true, bitwise:true, unparam:true */
2/*jshint unused:true */
3
4/*
5* Author: Zion Orent <zorent@ics.com>
6* Copyright (c) 2015 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 digitalAccelerometer = require('jsupm_mma7660');
29
30// Instantiate an MMA7660 on I2C bus 0
31var myDigitalAccelerometer = new digitalAccelerometer.MMA7660(
32					digitalAccelerometer.MMA7660_I2C_BUS,
33					digitalAccelerometer.MMA7660_DEFAULT_I2C_ADDR);
34
35// place device in standby mode so we can write registers
36myDigitalAccelerometer.setModeStandby();
37
38// enable 64 samples per second
39myDigitalAccelerometer.setSampleRate(digitalAccelerometer.MMA7660.AUTOSLEEP_64);
40
41// place device into active mode
42myDigitalAccelerometer.setModeActive();
43
44var x, y, z;
45x = digitalAccelerometer.new_intp();
46y = digitalAccelerometer.new_intp();
47z = digitalAccelerometer.new_intp();
48
49var ax, ay, az;
50ax = digitalAccelerometer.new_floatp();
51ay = digitalAccelerometer.new_floatp();
52az = digitalAccelerometer.new_floatp();
53
54var outputStr;
55
56var myInterval = setInterval(function()
57{
58	myDigitalAccelerometer.getRawValues(x, y, z);
59	outputStr = "Raw values: x = " + digitalAccelerometer.intp_value(x) +
60	" y = " + digitalAccelerometer.intp_value(y) +
61	" z = " + digitalAccelerometer.intp_value(z);
62	console.log(outputStr);
63
64	myDigitalAccelerometer.getAcceleration(ax, ay, az);
65	outputStr = "Acceleration: x = "
66		+ roundNum(digitalAccelerometer.floatp_value(ax), 6)
67		+ "g y = " + roundNum(digitalAccelerometer.floatp_value(ay), 6)
68		+ "g z = " + roundNum(digitalAccelerometer.floatp_value(az), 6) + "g";
69	console.log(outputStr);
70}, 500);
71
72// round off output to match C example, which has 6 decimal places
73function roundNum(num, decimalPlaces)
74{
75	var extraNum = (1 / (Math.pow(10, decimalPlaces) * 1000));
76	return (Math.round((num + extraNum)
77		* (Math.pow(10, decimalPlaces))) / Math.pow(10, decimalPlaces));
78}
79
80// When exiting: clear interval and print message
81process.on('SIGINT', function()
82{
83	clearInterval(myInterval);
84
85	// clean up memory
86	digitalAccelerometer.delete_intp(x);
87	digitalAccelerometer.delete_intp(y);
88	digitalAccelerometer.delete_intp(z);
89
90	digitalAccelerometer.delete_floatp(ax);
91	digitalAccelerometer.delete_floatp(ay);
92	digitalAccelerometer.delete_floatp(az);
93
94	myDigitalAccelerometer.setModeStandby();
95
96	console.log("Exiting...");
97	process.exit(0);
98});
99