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Merge pull request #78 from PTS93/master

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Made node.js hid example more friendly for new users
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hathach 2019-05-27 10:21:50 +07:00 committed by GitHub
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1 changed files with 55 additions and 10 deletions
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65
examples/device/hid_generic_inout/hid_test.js
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@ -1,22 +1,67 @@
// IMPORTANT: install 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')
var isWin = (os.platform() === 'win32');
var devices = HID.devices();
var deviceInfo = devices.find( function(d) {
var isNRF = d.vendorId===0Xcafe && d.productId===0X4004;
return isNRF;
});
// choose either of the following supported devices:
// Metro_nRF52840, Feather_nRF52840
var deviceInfo = devices.find(Feather_nRF52840);
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)});
// Windows wants you to prepend a 0 to whatever you send
if(isWin){
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 );
device.on("data", function(data) { console.log(data.toString('hex')); });
// 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 () {
var buf = Array(reportLen);
for( var i=0; i<buf.length; i++) {
buf[i] = 0x30 + i; // 0x30 = '0'
}
device.write(buf);
device.write(messageBuffer);
},500)
}
function Feather_nRF52840(d) {
return isDevice(0X239A,0X8029,d)
}
function Metro_nRF52840(d) {
return isDevice(0X239A,0X803F,d)
}
function isDevice(vid,pid,d){
return d.vendorId==vid && d.productId==pid;
}