Transcription of AN249: Human Interface Device Tutorial - Silicon Labs
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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
data reception and transmission-related events, by setting flags. These flags trigger the servicing of an interrupt service routine (ISR) if interrupts have been enabled. 3.1.3. USB Device Classes The USB specification and supplemental documents define a number of device classes that categorize USB
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