Atmel Xplained Evaluation Board ATXMEGAA3BU-XPLD ATXMEGAA3BU-XPLD Hoja De Datos

 

8413A-AVR-09/11 

• SPI 

clock 

• SPI 

data 

 
 
The ST7565R is always initialized by performing a hard reset of the LCD controller to 
bring it to a known state, as its state cannot be read from the controller.  Please refer 
to the “XMEGA-A3BU Xplained Hardware User’s Guide” for more information about 
physical pin connections. 

The ST7565R driver (

st7565r.c

 and 

st7565r.h

) takes care of all low level 

interfacing with the reset line, register select line, chip select line and the SPI driver. 
The ST7565R driver offers a number of functions used by higher level display stacks, 
such as the 

gfx_mono

 service. The driver may also be used directly, if needed. These 

functions are described and thoroughly documented in the ASF documentation. 

 
A white LCD backlight is also available for the screen. The backlight can simply be 
either on or off, or controlled by a PWM signal, which in turn controls the intensity of 
the backlight. 

The Atmel AVR XMEGA-A3BU Xplained board contains one Atmel

®

QTouch

®

 button 

named QTB0. This button is utilized by the inclusion of the QTouch library. Please 
refer to the Atmel QTouch Library User Guide for details on this library. 

From the application the QTouch button functionality is initialized from main with the 
call to 

touch_init()

, and the button is checked with the function 

check_touch_key_pressed()

. It is polled together with the other buttons in the file 

keyboard.c, and will provide menu navigation to the application. The QTouch API is 

available under the directory 

qtouch

 as the file 

touch_api.h

 together with other files 

from the QTouch library. Configuration of the QTouch library is done with defines 
declared in 

touch_qt_config.h

.