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

 

8413A-AVR-09/11 

The demo application consists of different applications selectable from a list when the 
device is started: 

Available applications 

Time zone application 

timezone.c timezone.h 

Date time application 

date_time.c date_time.h 

Production date application 

production_date.c production_date.h 

Temperature application 

ntc_sensor.c ntc_sensor.h 

Light sensor application 

lightsensor.c lightsensor.h 

Backlight toggling 

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When the XMEGA-A3BU Xplained 
board is powered on for the first time, 
the user is prompted to supply it with 
the current time zone from a list of 

hours from UTC -12 to UTC +12, as 
well as minute offsets. The new time 
zone settings are stored in EEPROM. As the UNIX timestamps generated by the RTC 
is in Coordinated Universal Time (UTC), this info will be used to display the time as 
local time. The time zone application is available in the date and time application 
available from the main menu, and is located in 

timezone.c

 and 

timezone.h

 

together with other time zone functionality. When the time zone application is started, 
it is not possible to return to the main menu before a time zone is selected. 

The date time application presents the user with a menu with the following options: 

•  “Show date&time” – display local date and time in the selected time zone 
•  “Set date” – Set the date 
•  “Set time”  - Set local time 
•  “Set timezone” – Set time zone hour and minute offset 

The menu uses the menu system, and all strings and options are defined at the top of 

date_time.c.

 This function handles calling the correct application based on the 

user’s choice in the menu. If the back 
button is pressed, the user will return 
to the main menu. 

The “Show date&time” application 
shows the current local date and time, 
computed from the RTC UNIX 
timestamp. Note that this time will not be completely accurate, due to inaccuracies in 
the RTC.