AUTOSAR LAYERED SOFTWARE ARCHITECTURE PDF

The AUTOSAR architecture is based on a 3-layered architecture model, developed jointly by the stakeholders of the automotive industry including — the automobile manufacturers, the suppliers, and the tool developers. The AUTOSAR specifies a three-layer architecture, which are categorized into following modules: Basic software BSW : can be defined as standardized software module offering various services necessary to run the functional part of the upper software layer. Thus, MCAL helps in making the upper layers independent of the low lying hardware platform. Application layer: The AUTOSAR application layer includes various application specific software components that are designed to execute specific set of tasks, as per the use-case. The application software component constitutes the simplest form of an application with certain functionality. AUTOSAR defines standardized interfaces associated with all the application software components required to develop automotive applications.

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The AUTOSAR architecture is based on a 3-layered architecture model, developed jointly by the stakeholders of the automotive industry including — the automobile manufacturers, the suppliers, and the tool developers. The AUTOSAR specifies a three-layer architecture, which are categorized into following modules: Basic software BSW : can be defined as standardized software module offering various services necessary to run the functional part of the upper software layer.

Thus, MCAL helps in making the upper layers independent of the low lying hardware platform. Application layer: The AUTOSAR application layer includes various application specific software components that are designed to execute specific set of tasks, as per the use-case.

The application software component constitutes the simplest form of an application with certain functionality. AUTOSAR defines standardized interfaces associated with all the application software components required to develop automotive applications.

These software components are connected with the help of well-defined ports. Runnable or Runnable Entities are defined within the VFB specifications and is part of an atomic software component described in a later section.

Runnable are defined as the smallest fragments of code or a sequence of instructions given by component and executed by RTE. A runnable entity is triggered either cyclically or during an event such as data reception. Composite Software Component: A composite component offers a logical interconnection of other components, which could be either atomic or composite.

These components are called prototypes and usually are not required to be deployed on the same ECU. Instead these can be distributed over several ECUs. Application Software Component: The application software component is an atomic software component that implements a part of an application. Calibration Parameter Component: This component provides values for calibration parameters. It can define ports to interact with other components in specific ways and can also interact directly with other basic-software modules.

A port is mapped to a single component and represents a communication point between the components. This definition of the interfaces helps in obtaining the required functionality of the vehicle application. The port interface required by an application software component serves as the input to the RTE port creation.

Here the client initiates the communication, and requests the server to perform a service. The server performs the request service and sends a response to the request.

Sender-Receiver interface: This interface defines an asynchronous information distribution and allows for a more data-oriented information exchange over the virtual function bus. The decision related to what all information should be exchanged through sender-receiver communication and which of the services should be called by the client-server communication — are taken by the interface.

This virtual bus abstracts the applications from the infrastructure. The VFB communicates via dedicated ports, which means that the communication interfaces of the application software must be mapped to these ports. Or Intra-ECU as explained in the diagram above. Both the inter and intra-ECU communication between the application software components communication is managed through the RTE. Application layer exchanges data with the underlying layers via the sender and receiver ports of the RTE.

And it is here that the Complex Device Driver comes into scenario. The concept of Complex driver is useful for application components that call for a direct access to the hardware devices on the ECU. Injection control or electronic valve control applications are good examples of such applications that require direct access to the hardware.

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AUTOSAR Software Architecture

The AUTOSAR architecture is based on a 3-layered architecture model, developed jointly by the stakeholders of the automotive industry including — the automobile manufacturers, the suppliers, and the tool developers. The AUTOSAR specifies a three-layer architecture, which are categorized into following modules: Basic software BSW : can be defined as standardized software module offering various services necessary to run the functional part of the upper software layer. Thus, MCAL helps in making the upper layers independent of the low lying hardware platform. Application layer: The AUTOSAR application layer includes various application specific software components that are designed to execute specific set of tasks, as per the use-case. The application software component constitutes the simplest form of an application with certain functionality. AUTOSAR defines standardized interfaces associated with all the application software components required to develop automotive applications. These software components are connected with the help of well-defined ports.

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