AN249: Human Interface Device Tutorial - Silicon Labs

Rev. 3/11 Copyright 2011 by Silicon LaboratoriesAN249AN249 Human Interface Device TUTORIAL1. IntroductionThe Human Interface Device (HID) class specification allows designers to create USB-based devices andapplications without the need for custom driver development. Their high levels of on-chip integration and robustUSB interfaces make Silicon Laboratories microcontrollers ideal devices for HID About this DocumentThis application note assumes that the reader has a basic understanding of the USB specification including someknowledge of endpoints, descriptors, and transfer protocols. This document concentrates on highlighting thebenefits of designing with HID and techniques for creating and optimizing HID-based systems that use SiliconLaboratories document includes the following: Discussion of HID Firmware template that can be used as a starting point for HID Device firmware Description of the HID DLL that can be used by host applications to communicate with HID devices Explanation of three example HID firmware systems implemented by modifying the template firmware Firmware source for each HID example discussed in the text Example code for host-side application HID ExamplesAll three HID examples in this application note were created using the included firmware template as a startingpoint.

The HID class of the universal serial bus (USB) protocol wa s created to define devices that interact to some degree with humans and transfer data within a computer system. 3.1. Universal Serial Bus The USB protocol presents significant advantages over other PC interfaces in versatility, speed, and reliability.

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