AT90USBxxx Keyboard demonstration

License

Use of this program is subject to Atmel's End User License Agreement.

Please read file lic_page for copyright notice.

Description

This embedded application source code illustrates how to implement a HID keyboard application with the AT90USBxxx controller.

About the source code

This source code is usable with the following compilers:

• IAR Embedded Workbench (5.11A and higher)
• AVRGCC (WinAVR 20080411 and higher).

Support for other compilers may required modifications or attention for:

• compiler.h file
• special registers declaration file
• interrupt subroutines declarations

Revision

V2.0.2

Update license header Fix compiler warning

V2.0.1

USB Stack

• Improve USB chap9 compliance
• Add three possibilities for SN on USB
• Move VBus interrupt to VBus pooling
• Fix USB constant about Device Status
• clean and fix specific request
• fix error HID class compliant
• WorkAround for "Transient perturbation in USB suspend mode generates overconsumption"

New watchdog driver

V2.0.0 and before

Old versions

About the sample application

By default the sample code is delivered configured for STK525, but this sample application can be configured for both STK525 or AT90USBKey hardware, see TARGET_BOARD define value in config.h file.

Architecture

As illustrated in the figure bellow, the application entry point is located is the main.c file. The main function first performs the initialization of a scheduler module and then runs it in an infinite loop. The scheduler is a simple infinite loop calling all its tasks defined in the conf_scheduler.h file. No real time schedule is performed, when a task ends, the scheduler calls the next task defined in the configuration file (conf_scheduler.h).

The sample device application is based on two different tasks:

• The usb_task (usb_task.c associated source file), is the task performing the USB low level enumeration process in device mode.
• The keyboard task performs keyboard decoding and build the HID keyboard repport.

This demonstration application displays a welcome message generated from keyboard input when pushing the select button of the joystick.

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