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      1 /*jslint node:true, vars:true, bitwise:true, unparam:true */
      2 /*jshint unused:true */
      3 
      4 /*
      5 * Author: Zion Orent <zorent (at) 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 
     28 var MOSFETsensor = require("jsupm_cjq4435");
     29 
     30 var g_addnumBool = true;
     31 var g_cycleNum = 0.0;
     32 var g_cycleCount = 0;
     33 
     34 // Instantiate a CJQ4435 MOSFET on a PWM capable digital pin D3
     35 var myMOSFETsensor = new MOSFETsensor.CJQ4435(3);
     36 
     37 myMOSFETsensor.setPeriodMS(10);
     38 myMOSFETsensor.enable(true);
     39 
     40 // A note on timing:
     41 //	In the C++ example, the system sleeps 11 times for 100 milliseconds
     42 //	between each duty cycle. After reaching the last point of the cycle,
     43 //	the system sleeps again for 1 second.
     44 //	The sleeps are cumulative, so the system has slept for 2.1 seconds
     45 //	sum total for each cycle.
     46 //	setInterval and setTimeout make asynchronous function calls;
     47 //	they aren't cumulative.
     48 //	In order to approximate the behavior of the C++ example, we need
     49 //	to call each iteration 2.1 seconds apart instead of 1 second apart.
     50 
     51 var myInterval = setInterval(function()
     52 {
     53 	setDutyCycle();
     54 }, (1000 + (11*100)) );
     55 
     56 
     57 // We start with a duty cycle of 0.0 (off) and increment to 1.0 (on)
     58 // Then we take it back down,
     59 // starting with a duty cycle of 1.0 (on) and decrement to 0.0 (off)
     60 function setDutyCycle()
     61 {
     62 	myMOSFETsensor.setDutyCycle(g_cycleNum);
     63 	if (g_addnumBool)
     64 		g_cycleNum += 0.1;
     65 	else
     66 		g_cycleNum -= 0.1;
     67 	g_cycleCount++;
     68 	if (g_cycleCount > 10)
     69 	{
     70 		g_addnumBool = !g_addnumBool;
     71 		g_cycleCount = 0;
     72 	}
     73 	else
     74 		setTimeout(setDutyCycle, 100);
     75 }
     76 
     77 
     78 // When exiting: clear interval and print exit message
     79 process.on('SIGINT', function()
     80 {
     81 	clearInterval(myInterval);
     82 	myMOSFETsensor = null;
     83 	MOSFETsensor.cleanUp();
     84 	MOSFETsensor = null;
     85 	console.log("Exiting...");
     86 	process.exit(0);
     87 });
     88