Abstract: A system and a method are disclosed for allowing a host device to communicate with an accessory device using a lightweight communications protocol. A communications link is first established between the connected accessory and host device. The host device sends a request for a register map file (RMF) to the accessory device. A RMF identifies registers for elements of the accessory device. The accessory device sends the RMF to host device, responsive to the request and the host device maps the RMF to interface with a higher level language such as C++ or JavaScript, allowing the host to act on the register mapping. Such interaction can be handled at the driver layer of an operating system, the application framework layer or the application layer. This permits both a layered service model and a fine-grant access at the application layer of the host device.

Abstract: A system and a method are disclosed for allowing a host device to communicate with an accessory device using a lightweight communications protocol. A communications link is first established between the connected accessory and host device. The host device sends a request for a register map file (RMF) to the accessory device. A RMF identifies registers for elements of the accessory device. The accessory device sends the RMF to host device, responsive to the request and the host device maps the RMF to interface with a higher level language such as C++ or JavaScript, allowing the host to act on the register mapping. Such interaction can be handled at the driver layer of an operating system, the application framework layer or the application layer. This permits both a layered service model and a fine-grant access at the application layer of the host device.