EasyManuals Logo

Arduino NG User Manual

Arduino NG
311 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #288 background imageLoading...
Page #288 background image
it to the
bind
method.
bind
creates a new function and sets the new functions
this
keyword to the value you passed to
bind
originally. Using
bind
, you can
define a function now, but make sure that it has a certain context when you
actually call it.
When working with event handlers, this is often necessary. Users of the
Seri-
alDevice
class should be able to pass their own callback functions, but they
should be executed in the class context. Youll see how this works in a minute.
At the end of the constructor, we define three instance variables that are all
instances of the
chrome.Event
class.
10
This class provides some nice features to
define and dispatch events within Chrome apps. We use it to define the three
events that users of our
SerialDevice
class can listen for. Now users can register
for
readLine
events using the
onReadLine
property.
The next three methods of the
SerialDevice
class implement everything needed
for connecting and disconnecting serial devices:
ChromeApps/SerialDevice/js/serial_device.js
SerialDevice.prototype.connect = function() {
Line 1
chrome.serial.connect(
-
this.path,
-
{ bitrate: this.baudRate },
-
this.onConnectComplete.bind(this))
5
};
-
-
SerialDevice.prototype.onConnectComplete = function(connectionInfo) {
-
if (!connectionInfo) {
-
console.log("Could not connect to serial device.");
10
return;
-
}
-
this.connectionId = connectionInfo.connectionId;
-
chrome.serial.onReceive.addListener(this.boundOnReceive);
-
chrome.serial.onReceiveError.addListener(this.boundOnReceiveError);
15
this.onConnect.dispatch();
-
};
-
-
SerialDevice.prototype.disconnect = function() {
-
if (this.connectionId < 0) {
20
throw "No serial device connected.";
-
}
-
chrome.serial.disconnect(this.connectionId, function() {});
-
};
-
10.
https://developer.chrome.com/extensions/events
Appendix 4. Controlling the Arduino with a Browser 276
report erratum discuss
www.it-ebooks.info

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Arduino NG and is the answer not in the manual?

Arduino NG Specifications

General IconGeneral
BrandArduino
ModelNG
CategoryMotherboard
LanguageEnglish

Related product manuals