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2 Overview
The Atmel Sensors Xplained software is implemented as a common service
extension to the Atmel AVR Software Framework (ASF), version 2.5 and later. The
sensor software includes a high-level, portable C/C++ API, binary libraries containing
sensor drivers, sensor configuration mechanisms, and example applications
illustrating sensor API calls. Applications do not require any code that is specific to a
particular sensor device. Instead, the application interacts with sensors in a device-
independent manner and can be retargeted to different combinations of
microcontrollers and sensors using a few basic configuration constants and linking
against the appropriate driver library.
2.1 Common sensors service
The Sensors Xplained API portion is installed as a shared service in an ASF 2.x tree
in the common/services/sensors directory, and includes API and driver header files,
configuration header files for ASF services and target board support modules, and
high-level utility functions.
Sensor device drivers and some interface routines in the Sensors Xplained API are
distributed only as linkable binary modules, without source code. All applications
written to this API must link against the appropriate library archive found in toolchain-
specific subdirectories below the thirdparty/sensors/libs directory. In addition,
the sensor hardware and platform interfaces make extensive use of conditionally
compiled ASF services and platform interfaces. As a result, additional ASF source
files are required when building an application that uses the Sensors Xplained
libraries. These dependencies are managed by the Atmel AVR Studio ? 5 project
facility.
2.1.1 Sensors Xplained API modules
The common/services/sensors directory contains header files and C language
implementation files defining the Sensors Xplained application programming interface
(API). These include the
sensor.h
file (described below) and the
sensor_platform.c source file that is part of the sensor configuration mechanism.
A sensor API hardware abstraction layer (HAL) acts as a translation layer between
the AVR Software Framework drivers, sensor drivers, target board platform, and
sensor API. These statically configured modules provide access to the various driver
and board interfaces. The sensor_platform_init() routine is the primary runtime
mechanism by which applications initialize the target Xplained evaluation board and
Sensors Xplained board for use by the sensor API. Your application should call
sensor_platform_init() as its first step during system initialization. It replaces the
board_init() call that is typically made in other ASF-based applications.
The common/services/sensors directory also contains various other header and
source files. These are used by modules within the sensor service. You should not
include these files directly in your application or depend on the internal definitions,
which are subject to change in future releases.
2.1.2 The sensor.h header file
The common/services/sensors directory contains the sensor.h header file, which
is the primary file containing definitions that are required to use the Common Sensors
Service. These definitions include function prototypes for all API interfaces, data
2
Atmel AVR4016
8367B-AVR-06/11
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