Android AOA / OTG HUB

PDF	Connecting to the IOIO-OTG Connection to an Android Device When connected to an Android device the IOIO-OTG will act as a USB host using either the widely supported Android Debug Bridge (ADB) protocol or the newer higher performance Android Open Accessory (AOA) protocol if supported by the Android

What is Android Open Accessory (AOA)?

Android Open Accessory (AOA) support allows external USB hardware (Android USB accessories) to interact with Android-powered devices in accessory mode. When an Android-powered device is in accessory mode, the connected accessory acts as the USB host (powers the bus and enumerates devices) and the Android-powered device acts as the USB accessory.

What does aoav2 do?

AOAv2 includes new USB product IDs for each combination of USB interfaces available in accessory mode: Provides two bulk endpoints for communicating with an Android application. For debugging purposes during accessory development. Available only if the user has enabled USB Debugging in the Android device settings.

Is aoav2 backward compatible?

AOAv2 is backward-compatible with AOAv1, so accessories designed for the original accessory protocol continue to work with newer Android devices. The following example from the Accessory Development Kit 2011 source code ( /adk1/board/AndroidAccessory/AndroidAccessory.cpp ) library demonstrates this protocol check:

Does Android 8.0 support aoav2 audio?

Caution: AOAv2 audio support has been deprecated in Android 8.0. AOAv2 includes support for audio output from an Android device to an accessory via a standard USB audio class interface capable of 2 channel, 16-bit PCM audio with a bit rate of 44100 Khz (additional audio modes may be added in the future).

Wait For and Detect ConnectedDevices

Accessories should continuously check for connected Android-powered devices.When a device is connected, the accessory should determine if the devicesupports accessory mode. source.android.com

Determine Accessory Mode Support

Note: USB debugging isn't required for connecting accessories but ADB might be necessary during development. For details, see Debug considerations. When an Android-powered device connects, it can be in one of three states: 1. Supports Android accessory mode and is already in accessory mode. 2. Supports Android accessory mode but it is not in access

Attempt to Start in Accessorymode

If the version, vendor, and product IDs do not correspond to an Android-powereddevice in accessory mode, the accessory cannot determine if the device supports (butis not in) accessory mode or if the device does not support accessory mode. Thiscan occur because devices that support accessory mode (but are not in accessorymode) initially report the d

Establish Communication withthe Device

If the accessory detects an Android-powered device in accessory mode, theaccessory can query the device interface and endpoint descriptors to obtain thebulk endpoints for communicating with the device. The number of interfaces and bulk endpoints depends on the product ID. AnAndroid-powered device with a product ID of: 1. 0x2D00has one interface wit

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