Where to buy android accessory development kit

The following sections provide more information about the Android Accessory Development Kits, how to use them, and how to get started building your own accessories for Android. About Android Legal Support. Quicknav Quicknav. Results Loading The AndroidAccessory::switchDevice method takes care of this:.

If a device is detected as being in accessory mode, the accessory must find the proper bulk endpoints and set up communication with the device. The AndroidAccessory::findEndpoints function queries the Android-powered device's configuration descriptor and finds the bulk data endpoints in which to communicate with the USB device. To do this, it first gets the device's first four bytes of the configuration descriptor only need descBuff[2] and descBuff[3] , which contains the information about the total length of data returned by getting the descriptor.

This data is used to determine whether or not the descriptor can fit in the descriptor buffer. This descriptor also contains information about all the interfaces and endpoint descriptors. If the descriptor is of appropriate size, the method reads the entire configuration descriptor and fills the entire descriptor buffer with this device's configuration descriptor. If for some reason the descriptor is no longer attainable, an error is returned.

Once the descriptor is in memory, a pointer is assigned to the first position of the buffer and is used to index the buffer for reading. There are two endpoint pointers input and output that are passed into AndroidAccessory::findEndpoints and their addresses are set to 0, because the code hasn't found any suitable bulk endpoints yet. A loop reads the buffer, parsing each configuration, interface, or endpoint descriptor.

For each descriptor, Position 0 always contains the size of the descriptor in bytes and position 1 always contains the descriptor type. Using these two values, the loop skips any configuration and interface descriptors and increments the buffer with the descLen variable to get to the next descriptor.

Note: An Android-powered device in accessory mode can potentially have two interfaces, one for the default communication to the device and the other for ADB communication.

The default communication interface is always indexed first, so finding the first input and output bulk endpoints will return the default communication endpoints, which is what the demokit. If you are writing your own firmware, the logic to find the appropriate endpoints for your accessory might be different. When it finds the first input and output endpoint descriptors, it sets the endpoint pointers to those addresses. If the findEndpoints function finds both an input and output endpoint, it returns true.

It ignores any other endpoints that it finds the endpoints for the ADB interface, if present. Back in the configureAndroid function, if there were endpoints found, they are appropriately set up for communication. The device's configuration is set to 1 and the state of the device is set to "running", which signifies that the device is properly set up to communicate with your USB accessory.

Setting this status prevents the device from being re-detected and re-configured in the AndroidAccessory::isConnected function. Lastly, methods to read and write to the appropriate endpoints are needed. The demokit. For instance, moving the joystick on the ADK shield writes data that is read by the DemoKit application running on the Android-powered device. Moving sliders on the DemoKit application is read by the demokit. Android Design Android. Was ist Android?

Qu'est-ce qu'Android? Through Tradefed. Through Suite. Developing TF. XML Configuration. Global Configuration. Advanced Concepts. Device Manager. Device setup. Evaluating Performance. Feature Implementation. Dynamic Partitions. Audio accessories Android supports local on-device audio and remote off-device audio over a wired 3. Custom accessories What do you want to connect to your Android device?

When an Android-powered powered device is in accessory mode, the connected accessory acts as the USB host powers the bus and enumerates devices and Android-powered device acts as the device. The reference ADK boards will be available for software and hardware developers or even anyone interested in things electronic to develop accessories that will work with apps.