By Rajaram Regupathy
While you're a multimedia developer on Android platform you would like USB for media move or playback audio. This publication explores MTP and USB Audio in either USB equipment and USB host mode.
If you're an center developer who paintings on charging you want to comprehend USB charging specification that's defined within the book,
If you're a networking developer drawn to tethering, USB performs a job utilizing RNDIS specification that is defined within the book
If you're an software developer drawn to dealing with USB units in from an Android platform, this e-book explores Android USB provider framework which manages USB functionalities
Last no longer the least, Android Debug Bridge (ADB) the debugging instrument of Android is over USB and information of its internals is a outline price upload for any program or platform developer. This booklet info the interior of ABD until eventually the kernel level.
Thus this publication covers every thing approximately USB on Android from diversified USB periods supported in machine mode to the USB host framework that manages USB machine hooked up to an Android platform. every one bankruptcy will clarify USB category specification prior to exploring how the performance (class) is applied in Android. this offers a fresh viewpoint for you as a reader on what the USB specification calls for and the way it applied in Android.
What you will learn
- Understand Android USB framework from APIs to the kernel layer and let improve USB program development.
- Learn all significant USB functionalities by way of exploring the USB type specification no longer coated in any of the USB books
- Learn the newly brought Android Open accent (AOA) Protocol and discover constructing NFC reader utilizing AOA protocol.
- Learn serious adjustments within the Android USB framework among various Android versions.
- Learn how USB charging works with rationalization from the USB Battery Specification.
- Learn easy methods to swap among MTP to Mass garage and vice versa to percentage garage to host PC.
Who this booklet is for
- The basic audiences of this e-book are software builders and engineers who do fingers on paintings with Android. This publication is for an program developer who has an APP thought with USB and wonders the right way to enforce it. This publication could be a distinct advisor for the developer and aid him/her to control USB on Android.
- With the publication overlaying from APIs to the Linux kernel, center platform builders reveals it effortless to place info element to debug. hence center Android platform builders engaged on USB, Audio, media and others are the following basic audiences of the book.
- Technical Managers or Architects or senior managers who search for eagle eye view of a procedure, are the secondary audiences of the ebook. The ebook will let them to appreciate the several blocks of the Android USB subsystem and could support plan and estimate complexity involved.
- Student and engineers can use this ebook as a do it your self reference e-book because the booklet explains diversified blocks the Android USB framework from program point to the kernel. scholars can use related learn method of comparable Android framework.
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Extra resources for Unboxing Android USB: A hands on approach with real world examples
Brought within the Jelly Bean model of Android, this option permits proprietors to come back up with new different types of add-ons which could obtain audio circulate from an Android gadget via USB and play it again to the clients. even though there aren't many units out there other than what was once established in Google I/O 2012 (by Gear4), the later 1/2 this bankruptcy explores easy methods to construct this accent audio machine. Now that you’ve learn a short assessment of the various USB audio units in the market, let’s discover how the Android framework contains the later USB audio gadget kinds inside of an Android-powered equipment. to appreciate the Android framework, it’s vital to appreciate USB audio. the next part presents a quick evaluate of the USB audio specification. USB Audio Specification The USB audio type specification presents a customary mechanism to move audio over USB, and this part relies at the USB-IF’s gadget classification definition for audio units, liberate 1. zero. The USB audio specification permits audio units to interoperate by means of making software program drivers as accepted CHAPTER 6: USB Audio 103 as attainable. like every different USB machine, USB audio units use descriptors to explain their features to a number. those descriptors carry designated information regarding the audio gadget, together with information regarding how you can keep an eye on and move electronic audio. yet in contrast to different USB periods like Mass garage classification (MSC) or MTP, the place the descriptors are kind of mounted, a USB audio machine descriptor varies in line with the topology of the product. for the reason that lots of the good points are not obligatory and owners can construct an audio gadget with a number of functionalities, hence the descriptor tree varies among units. An audio equipment exposes its performance to a bunch via its interfaces, specifically the audio keep an eye on interfaceAudio streaming interface and the midi streaming interface. An audio functionality should have a minimum of one audio regulate interface; the streaming interfaces are non-compulsory. a suite of unmarried regulate interfaces and units of streaming interfaces is named an “audio interface assortment. ” determine 6-1 represents an audio functionality with various interfaces, as illustrated within the USB audio category specification. determine 6-1. Audio functionality view as illustrated by means of the USB audio type specification in basic terms, the audio keep an eye on interface is used to regulate performance that without delay impacts audio notion, together with quantity keep an eye on, and the audio streaming interface is especially used to move audio info among the audio functionality and the exterior global. 104 bankruptcy 6: USB Audio to regulate the homes of an audio functionality, the USB audio type specification represents the audio functionality as addressable entities, specifically terminals and devices. devices shape the construction blocks of an audio functionality, representing sub-functionality of the USB functionality. those are the 5 average devices as outlined through the USB audio specification: Mixer Unit (MU) Selector Unit (SU) function Unit (FU) Processing Unit (PU) Extension Unit (XU) each one unit manages a undeniable performance of the audio functionality and is linked to a unit descriptor, which could determine and describe the features of the unit.