December 2011
Intermediate to advanced
485 pages
15h 47m
English
Content preview from OS X and iOS Kernel ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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USB Architecture
In a USB system, the host controller is the master and the USB devices are the subordinates. The USB topology is organized in a tree-like structure, which forms a bus, with the host controller being the root and the controller of the subordinated device. The host controller is responsible for coordinating activities on the bus, and a device is not able to perform I/O, or any other activity on the bus, without first being asked to do so by the host.
The tree structure branches out with the help of hubs, which allow connected devices to become part of the bus, and thus extend it, as a new branch. The subordinate devices of a hub can have other hubs connected to them— up to four levels deep is possible. The root hub is usually embedded ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.