AT90USBxxx CDC 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 CDC application with the AT90USBxxx controller.

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. When using an AT90USBKey only joystich events are send to the USB serial COM port (the full USART <-> USB bridge is not availabla as the AT90USBKey does not provide physical USART interface).

This application will enumerates as a CDC (communication device class) virtual COM port. The application can be used as a USB to serial converter.

Revision

V2.0.6
Update license

V2.0.5

V2.0.4
USB Device Stack :

V2.0.3 and before
Old releases

About the source code

This source code is usable with the following compilers:

Support for other compilers may required modifications or attention for:

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 dual role application is based on two different tasks:

arch_full.gif

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