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// IMPORTANT: install the dependency via 'npm i node-hid' in the same location as the script
// 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
var HID = require('node-hid');
var os = require('os')
// list of supported devices
var boards = require('./boards.js')
var devices = HID.devices();
// this will choose any device found in the boards.js file
var deviceInfo = devices.find(anySupportedBoard);
var reportLen = 64;
var message = "Hello World!"
// Turn our string into an array of integers e.g. 'ascii codes', though charCodeAt spits out UTF-16
// 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
var messageBuffer = Array.from(message, function(c){return c.charCodeAt(0)});
// HIDAPI requires us to prepend a 0 for single hid report as dummy reportID
messageBuffer.unshift(0)
// Some OSes expect that you always send a buffer that equals your report length
// So lets fill up the rest of the buffer with zeros
var paddingBuf = Array(reportLen-messageBuffer.length);
paddingBuf.fill(0)
messageBuffer = messageBuffer.concat(paddingBuf)
// check if we actually found a device and if so send our messageBuffer to it
if( deviceInfo ) {
console.log(deviceInfo)
var device = new HID.HID( deviceInfo.path );
// register an event listener for data coming from the device
device.on("data", function(data) {
// Print what we get from the device
console.log(data.toString('ascii'));
});
// the same for any error that occur
device.on("error", function(err) {console.log(err)});
// send our message to the device every 500ms
setInterval(function () {
device.write(messageBuffer);
},500)
}
function anySupportedBoard(d) {
for (var key in boards) {
if (boards.hasOwnProperty(key)) {
if (isDevice(boards[key],d)) {
console.log("Found " + d.product);
return true;
}
}
}
return false;
}
function isDevice(board,d){
// product id 0xff is matches all
return d.vendorId==board[0] && (d.productId==board[1] || board[1] == 0xFFFF);
}
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