Automotive Embedded System Development in AUTOSAR

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Automotive Embedded System Development in AUTOSAR
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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

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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

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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