Atmel Xplained Evaluation Board ATXMEGAA3BU-XPLD ATXMEGAA3BU-XPLD Data Sheet

 

8413A-AVR-09/11 

The production time application uses the calendar service to convert the production 
time timestamp and the current timestamp to a date and calculate the difference 
between them. 

The date and time application uses the service to convert the current timestamp into 
the local time and date. 

The demo application allows the XMEGA-A3BU Xplained board to communicate with 
a computer using USB with a CDC (Communications Device Class) setup, allowing 
the keyboard to be used to navigate in the demo application. This functionality is 
available in the files 

cdc.c

 and 

cdc.h

. The application calls 

cdc_start()

, which 

reads in the USB serial number from user signature row, which is later passed to the 
USB stack. The configuration of the USB CDC device is done in 

conf_usb.h

. The 

keyboard interface available in 

keyboard.c

 and 

keyboard.h

 uses 

cdc_getkey()

 to 

read a key from the CDC interface, and translates it to a usable keycode. 

The USB CDC service allows the demo application to be controlled by a computer 
keyboard. When the XMEGA-A3BU Xplained board is connected for the first time, 
Windows will try to install a driver for “Virtual CDC Com”. A driver file, 

XPLAINED_Virtual_Com_Port.inf

, is located in the demo application directory. If the 

driver is successfully installed, the board will show up in in the Device Manager, 
under Ports (

XPLAINED Virtual Com Port (COM**)

). This COM port can now be 

interfaced with your favourite terminal software.

2

 The connection parameters are as 

follows: 

115200 

8 

None 

1 

None 

 

If the connection has been successfully established, you should be greeted by this 
text on the screen of your terminal: 

Welcome to the XMEGA-A3BU Xplained Demo CDC interface! 
 
Key bindings for LCD menu control: 
  Enter      : Enter 
  Backspace  : Back 
  Arrow Up   : Up 
  Arrow Down : Down 

 

You should now be able to control the demo application with your keyboard. 

                                                      

2

 If you are using Windows XP, you can use the built in HyperTerminal (Run dialog → 

hypertrm). If you are using Windows 7, you can download PuTTY, or RealTerm.