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59 lines
1.7 KiB
JavaScript
59 lines
1.7 KiB
JavaScript
/*
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* Author: Zion Orent <zorent@ics.com>
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* Copyright (c) 2015 Intel Corporation.
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*
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* This program and the accompanying materials are made available under the
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* terms of the The MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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*/
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var LEDBar = require("jsupm_my9221");
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// Instantiate a MY9221, we use D8 for the data, and D9 for the
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// data clock. This was tested with a Grove LED bar.
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var myLEDBar = new LEDBar.GroveLEDBar(8, 9);
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var directionBool = true;
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// A note on timing:
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// In the C++ example, the system sleeps 10 times for 50 milliseconds
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// between each LED lighting. After the LED has reached the last light
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// of the cycle, the system sleeps again for 1 second.
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// The sleeps are cumulative, so the system has slept for 1.5 seconds
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// sum total for each cycle.
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// setInterval and setTimeout make asynchronous function calls;
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// they aren't cumulative.
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// In order to approximate the behavior of the C++ example, we need
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// to call each iteration 1.5 seconds apart instead of 1 second apart.
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var myInterval = setInterval(function()
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{
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// start showing LED strip with just the first one lit
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show_LED(1, directionBool);
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}, (1000 + (10*50)) );
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function show_LED(level, direction)
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{
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// If it's less than 10
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// light up the LED now
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// call show_LED again in 50 ms
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if (level <= 10)
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{
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myLEDBar.setBarLevel(level, directionBool);
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setTimeout(show_LED, 50, ++level, directionBool);
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}
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// Switch LED lighting directions between lighting cycles
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else
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directionBool = !directionBool;
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}
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// When exiting: clear LED strip lights, clear interval, print exit message
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process.on('SIGINT', function()
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{
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myLEDBar.setBarLevel(0, true);
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clearInterval(myInterval);
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console.log("Exiting...");
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process.exit(0);
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});
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