1/*jslint node:true, vars:true, bitwise:true, unparam:true */ 2/*jshint unused:true */ 3/* 4* Author: Zion Orent <zorent@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 27var LEDBar = require("jsupm_my9221"); 28 29// Instantiate a MY9221, we use D2 for the data, and D3 for the 30// data clock. This was tested with a Grove LED bar. 31var myLEDBar = new LEDBar.MY9221(2, 3); 32 33var directionBool = true; 34 35// A note on timing: 36// In the C++ example, the system sleeps 10 times for 50 milliseconds 37// between each LED lighting. After the LED has reached the last light 38// of the cycle, the system sleeps again for 1 second. 39// The sleeps are cumulative, so the system has slept for 1.5 seconds 40// sum total for each cycle. 41// setInterval and setTimeout make asynchronous function calls; 42// they aren't cumulative. 43// In order to approximate the behavior of the C++ example, we need 44// to call each iteration 1.5 seconds apart instead of 1 second apart. 45var myInterval = setInterval(function() 46{ 47 // start showing LED strip with just the first one lit 48 show_LED(1, directionBool); 49}, (1000 + (10*50)) ); 50 51function show_LED(level, direction) 52{ 53 // If it's less than 10 54 // light up the LED now 55 // call show_LED again in 50 ms 56 if (level <= 10) 57 { 58 myLEDBar.setBarLevel(level, directionBool); 59 setTimeout(show_LED, 50, ++level, directionBool); 60 } 61 // Switch LED lighting directions between lighting cycles 62 else 63 directionBool = !directionBool; 64} 65 66// When exiting: clear LED strip lights, clear interval, print exit message 67process.on('SIGINT', function() 68{ 69 myLEDBar.setBarLevel(0, true); 70 clearInterval(myInterval); 71 console.log("Exiting..."); 72 process.exit(0); 73}); 74