69 lines
2.1 KiB
JavaScript
69 lines
2.1 KiB
JavaScript
// IMPORTANT: install the dependency via 'npm i node-hid' in the same location as the script
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// If the install fails on windows you may need to run 'npm i -g windows-build-tools' first to be able to compile native code needed for this library
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var HID = require('node-hid');
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var os = require('os')
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// list of supported devices
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var boards = require('./boards.js')
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var devices = HID.devices();
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// this will choose any device found in the boards.js file
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var deviceInfo = devices.find(anySupportedBoard);
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var reportLen = 64;
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var message = "Hello World!"
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// Turn our string into an array of integers e.g. 'ascii codes', though charCodeAt spits out UTF-16
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// This means if you have characters in your string that are not Latin-1 you will have to add additional logic for character codes above 255
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var messageBuffer = Array.from(message, function(c){return c.charCodeAt(0)});
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// HIDAPI requires us to prepend a 0 for single hid report as dummy reportID
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messageBuffer.unshift(0)
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// Some OSes expect that you always send a buffer that equals your report length
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// So lets fill up the rest of the buffer with zeros
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var paddingBuf = Array(reportLen-messageBuffer.length);
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paddingBuf.fill(0)
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messageBuffer = messageBuffer.concat(paddingBuf)
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// check if we actually found a device and if so send our messageBuffer to it
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if( deviceInfo ) {
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console.log(deviceInfo)
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var device = new HID.HID( deviceInfo.path );
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// register an event listener for data coming from the device
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device.on("data", function(data) {
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// Print what we get from the device
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console.log(data.toString('ascii'));
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});
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// the same for any error that occur
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device.on("error", function(err) {console.log(err)});
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// send our message to the device every 500ms
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setInterval(function () {
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device.write(messageBuffer);
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},500)
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}
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function anySupportedBoard(d) {
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for (var key in boards) {
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if (boards.hasOwnProperty(key)) {
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if (isDevice(boards[key],d)) {
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console.log("Found " + d.product);
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return true;
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}
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}
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}
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return false;
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}
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function isDevice(board,d){
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// product id 0xff is matches all
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return d.vendorId==board[0] && (d.productId==board[1] || board[1] == 0xFFFF);
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}
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