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      1 /*jslint node:true, vars:true, bitwise:true, unparam:true */
      2 /*jshint unused:true */
      3 /*
      4 * Author: Zion Orent <zorent (at) ics.com>
      5 * Copyright (c) 2015 Intel Corporation.
      6 *
      7 * Permission is hereby granted, free of charge, to any person obtaining
      8 * a copy of this software and associated documentation files (the
      9 * "Software"), to deal in the Software without restriction, including
     10 * without limitation the rights to use, copy, modify, merge, publish,
     11 * distribute, sublicense, and/or sell copies of the Software, and to
     12 * permit persons to whom the Software is furnished to do so, subject to
     13 * the following conditions:
     14 *
     15 * The above copyright notice and this permission notice shall be
     16 * included in all copies or substantial portions of the Software.
     17 *
     18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     21 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
     22 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     23 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     24 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25 */
     26 
     27 function exit()
     28 {
     29 	console.log("Exiting");
     30 
     31 	if (myLEDController_obj)
     32 	{
     33 		// clear the bits we set earlier
     34 		myLEDController_obj.ledFullOff(3, false);
     35 		myLEDController_obj.ledFullOn(4, false);
     36 	}
     37 	myLEDController_obj = null;
     38 	if (LEDController_lib)
     39 	{
     40 		LEDController_lib.cleanUp();
     41 		LEDController_lib = null;
     42 	}
     43 	process.exit(0);
     44 }
     45 
     46 // The pca9685 is an led controller.
     47 // It's being used in this case to drive motors.
     48 var LEDController_lib = require('jsupm_pca9685');
     49 
     50 var I2CBus = LEDController_lib.PCA9685_I2C_BUS;
     51 var I2CAddr = LEDController_lib.PCA9685_DEFAULT_I2C_ADDR;
     52 // Instantiate an PCA9685 on I2C bus 0
     53 var myLEDController_obj = new LEDController_lib.PCA9685(I2CBus, I2CAddr);
     54 
     55 // put device to sleep
     56 myLEDController_obj.setModeSleep(true);
     57 
     58 // setup a period of 50Hz
     59 myLEDController_obj.setPrescaleFromHz(50);
     60 
     61 // wake device up
     62 myLEDController_obj.setModeSleep(false);
     63 
     64 // Setup a 50% duty cycle -- on time at 0, off time at 2048 (4096 / 2)
     65 // Set for all channels
     66 var LEDNum = LEDController_lib.PCA9685_ALL_LED;
     67 myLEDController_obj.ledOnTime(LEDNum, 0);
     68 myLEDController_obj.ledOffTime(LEDNum, 2048);
     69 
     70 // but, turn channel 3 full off and channel 4 full on
     71 console.log("Turning channel 3 off, and channel 4 on.");
     72 console.log("All other channels will be PWM'd at a 50% duty cycle.");
     73 
     74 myLEDController_obj.ledFullOff(3, true);
     75 myLEDController_obj.ledFullOn(4, true);
     76 
     77   // now, just sleep for 5 seconds, reset channels 3 and 4, and exit.
     78 console.log("Sleeping for 5 seconds...");
     79 
     80 setTimeout(exit, 5000);
     81 
     82 process.on('SIGINT', function()
     83 {
     84 	exit();
     85 });
     86