joystick12: JavaScript example for the Grove joystick

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>

examples/javascript/joystick12.js

@@ -0,0 +1,54 @@
+/*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 joystick = require('jsupm_joystick12');
+
+// Instantiate a joystick on analog pins A0 and A1
+var myJoystick = new joystick.Joystick12(0, 1);
+
+// Print the X and Y input values every second
+setInterval(function()
+{
+	var XString = "Driving X:" + roundNum(myJoystick.getXInput(), 6);
+	var YString = ": and Y:" + roundNum(myJoystick.getYInput(), 6);
+	console.log(XString + YString);
+}, 1000);
+
+function roundNum(num, decimalPlaces)
+{
+	var extraNum = (1 / (Math.pow(10, decimalPlaces) * 1000));
+	var numerator = Math.round((num + extraNum) * (Math.pow(10, decimalPlaces)));
+	var denominator = Math.pow(10, decimalPlaces);
+	return (numerator / denominator);
+}
+
+// Print message when exiting
+process.on('SIGINT', function()
+{
+	console.log("Exiting...");
+	process.exit(0);
+});