Automotive Embedded System
Development in AUTOSAR
Contents
What is AUTOSAR
AUTOSAR from a Technical Point of View
Example AUTOSAR System
Automotive Embedded System Development in AUTOSAR
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What is AUTOSAR
AUTOSAR (AUTomotive Open System Architecture)
 De-facto standard, jointly developed by automobile manufacturers, suppliers and tool
developers.
 More than 100 member companies
 Homepage : www.autosar.org
The idea of AUTOSAR
 Standardized and uniquely-specified interfaces basic software modules help to master the
increasing complexity
 The consequence is reusability, efficiency and easy handling of electronic in the automobile
AUTOSAR Target and Goal




Define open reference architecture for ECU software
Specify a clear interface between basis software components and application
Reusability
Growing software quality
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What is AUTOSAR
AUTOSAR partnership
10 Core Partners
48 Associate
Members
CapeWare
52 Premium Members
OEM
Tier 1
Standard
Software
Source:
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Tools
Semiconductors
What is AUTOSAR
AUTOSAR Project Objectives
 AUTOSAR vision is an improved complexity management of highly integrated E/E architectures
through an increased reuse of SW modules between OEM and suppliers.
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What is AUTOSAR
Benefits from AUTOSAR
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AUTOSAR from a Technical Point of View
AUTOSAR Layered Architecture
AUTOSAR
Software
Component
Interface
Application
Software
Component
Actuator
Software
Component
Sensor
Software
Component
AUTOSAR
Interface
AUTOSAR
Interface
AUTOSAR
Interface
Standardized
Interface
API 0
API 3 Private
Interfaces inside
Basic Software
possible
Operating
System
Standardized
Inteface
API 2
VFB & RTE
relevant
API 1
RTE
relevant
..............
AUTOSAR
Interface
AUTOSAR Runtime Environment (RTE)
ECU
Firmware
Standard
Software
AUTOSAR
Software
Application
Software
Component
Standardized
AUTOSAR
Interface
Standardized
Interface
AUTOSAR
Interface
Services
Communication
ECU
Abstraction
Standardized
Interface
Standardized
Interface
Standardized
Interface
Standardized
Interface
Basic Software
ECU-Hardware
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Microcontroller
Abstraction
AUTOSAR
Interface
Complex
Device
Drivers
AUTOSAR from a Technical Point of View
AUTOSAR Layered Architecture
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AUTOSAR from a Technical Point of View
Methodology
 Derive E/E architecture from formal descriptions of soft- and hardware components
Functional software is described formally in terms
of “software Components” (SW-C).
Using “Software Component Descriptions” as input,
the “Virtual Functional Bus” validates the interaction
of all components and interfaces before software
implementation.
Mapping of “Software Components” to ECUs and
configuration of basic software.
The AUTOSAR Methodology supports the
generation of an E/E architecture.
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AUTOSAR from a Technical Point of View
AUTOSAR SW-C (Software Component)
 Application is divided into SW-Cs.
 Software Components consist of
 Ports
Interface to other SW-Cs
 Runnable Entities (or Runnables)
Procedures which contain the actual implementation
Triggered cyclically or on event (e.g. data reception)
 Other software components
Composite components for hierarchical design
 Three types of SW-C
 Atomic SW-C
 Composite SW-C
 Sensor/Actuator SW-C
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AUTOSAR from a Technical Point of View
RTE (Runtime Environment)





Implementation of Virtual Functional Bus
Interface between SW-Cs and Basic Software
All calls to basic software pass through the RTE
Communication method : Send/Receive signals, Client/Server functionality
Triggering of runnables : Cyclically or On event
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AUTOSAR from a Technical Point of View
MCAL (Microcontroller Abstraction Layer)
 MCAL is the lowest software layer of the Basic Software
 It contains internal drivers, which are software modules with direct access to the microcontroller
internal peripherals and memory mapped microcontroller external devices
 Make higher software layers independent of microcontroller
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AUTOSAR from a Technical Point of View
EAL (ECU Abstraction Layer)
 The EAL interfaces the drivers of the MACL
 It also contains drivers for external devices
 It offers an API for access to peripherals and divides regardless of their location and their
connection to the microcontroller (port pins, type of interface)
 Make higher software layers independent of ECU hardware layout
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AUTOSAR from a Technical Point of View
Services Layer
 Services Layer is the highest layer of the Basic software which also applies for its relevance for
the application software
 The Services layer offers
 Operating system functionality
 Vehicle network communication and management services
 Memory services (NVRAM management)
 Diagnostic services
 ECU state management
 Provide basic services for application and Basic Software modules
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Example AUTOSAR System : Lighting System
Software Component View
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Example AUTOSAR System : Lighting System
Virtual Functional Bus View
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Example AUTOSAR System : Lighting System
Mapped System
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Example AUTOSAR System : Lighting System
Basic Software Architecture
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