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Extract getUsbEndpoints() to util.js. Use ES6 features in led_pwm.js

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László Monda
2017-01-15 01:00:55 +01:00
parent 180d40a7a5
commit 199030effb
2 changed files with 31 additions and 28 deletions
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36
usb/led_pwm.js
View File

@@ -1,39 +1,19 @@
#!/usr/bin/env node #!/usr/bin/env node
'use strict'; let util = require('./util');
var usb = require('usb'); let LED_PWM_COMMAND_ID = 10;
var util = require('./util'); let [endpointIn, endpointOut] = util.getUsbEndpoints();
let brightnessPercent = 0;
var vid = 0x16d3; setInterval(() => {
var pid = 0x05ea;
var LED_PWM_COMMAND_ID = 10;
var device = usb.findByIds(vid, pid);
device.open();
var usbInterface = device.interface(0);
// https://github.com/tessel/node-usb/issues/147
// The function 'isKernelDriverActive' is not available on Windows and not even needed.
if (process.platform !== 'win32' && usbInterface.isKernelDriverActive()) {
usbInterface.detachKernelDriver();
}
usbInterface.claim();
var endpointIn = usbInterface.endpoints[0];
var endpointOut = usbInterface.endpoints[1];
var brightnessPercent = 0;
setInterval(function() {
brightnessPercent = brightnessPercent ? 0 : 100 brightnessPercent = brightnessPercent ? 0 : 100
console.log('Sending ', brightnessPercent); console.log('Sending ', brightnessPercent);
endpointOut.transfer(new Buffer([LED_PWM_COMMAND_ID, brightnessPercent]), function(err) { endpointOut.transfer(new Buffer([LED_PWM_COMMAND_ID, brightnessPercent]), err => {
if (err) { if (err) {
console.error("USB error: %s", err); console.error("USB error: %s", err);
process.exit(1); process.exit(1);
} }
endpointIn.transfer(64, function(err2, receivedBuffer) { endpointIn.transfer(64, (err2, receivedBuffer) => {
if (err2) { if (err2) {
console.error("USB error: %s", err2); console.error("USB error: %s", err2);
process.exit(2); process.exit(2);
@@ -41,4 +21,4 @@ setInterval(function() {
console.log('Received', util.bufferToString(receivedBuffer)); console.log('Received', util.bufferToString(receivedBuffer));
}) })
}); });
}, 500) }, 500);

23
usb/util.js
View File

@@ -1,4 +1,27 @@
var usb = require('usb');
exports = module.exports = { exports = module.exports = {
getUsbEndpoints: function() {
var vid = 0x16d3;
var pid = 0x05ea;
var device = usb.findByIds(vid, pid);
device.open();
var usbInterface = device.interface(0);
// https://github.com/tessel/node-usb/issues/147
// The function 'isKernelDriverActive' is not available on Windows and not even needed.
if (process.platform !== 'win32' && usbInterface.isKernelDriverActive()) {
usbInterface.detachKernelDriver();
}
usbInterface.claim();
var endpointIn = usbInterface.endpoints[0];
var endpointOut = usbInterface.endpoints[1];
return [endpointIn, endpointOut];
},
bufferToString: function(buffer) { bufferToString: function(buffer) {
var str = ''; var str = '';
for (var i = 0; i < buffer.length; i++) { for (var i = 0; i < buffer.length; i++) {