[AUTOSAR I overview]

1. AutoSAR summary

• AUTOSAR Namely AUTomotive Open System ARchitecture For short , The Chinese translation is the open system architecture of automobile

1.1 AutoSAR Architecture layering

1.1.1 Auto Three tier architecture of

• Application software layer (AppL) It is mainly used to store our own code
• Real time running environment (RTE) It is to provide the resources required by the application layer , At the same time, the application layer and the bottom layer are isolated
• Basic software layer (BSW) Is to package the hardware , All the way to the state of a standard operating system , So that the upper layer can call system services in a standardized way

The application layer and BSW Layers are larger than other layers , This is because they can be subdivided , Next, let's look at the following picture , We subdivide the application layer and the basic software layer , Now we will discuss these layers separately ：

1.1.2 Application software layer AppL

1.1.3 Real time running environment RTE

RTE More like a virtual machine , While isolating the upper application from the lower operating system , It is also compatible with software developed by different manufacturers .

1.1.4 Basic software layer BSW

The basic software layer is divided into 4 Most of the :

1. Hardware abstraction layer （MCAL）： Maybe I used it STM32 All children's shoes should know the concept of Library , The hardware abstraction layer is also called MCAL, That is to package the register operations of the chip into one AutoSAR Specified Unified Library Api. That is to say, this set Api It is supported by different manufacturers , But how to realize it at the bottom , It's about the chip manufacturer . There are also software tools EB, It can be configured through the interface MCAL function

2. ECU Abstraction layer ： if MCAL Only the chip is encapsulated , that ECU The abstraction layer encapsulates all the hardware on the hardware . For example, our controller has a main chip Infineon TC275, And sampling circuit , Power circuit ,CAN Circuits, etc . and MCAL It encapsulates the functions of the chip . and ECU The abstraction layer is to make all these into a unified package . So no matter how the hardware is implemented , After encapsulation here , Also formed a unified Api

3. Service layer ： Here is a more advanced level , The service layer contains the operating system （OS） Of .OS Will use ECU Abstract layer Api, Then expose the service interface to the upper layer , In fact, it is an embedded real-time operating system （RTOS） The work done .

4. Complex drive ： Also known as CDD, The main task is to AutoSAR Some undefined functions are encapsulated , Provide interfaces to the application layer to invoke these functions .（ Simply put, other concepts ）

1.2 Tool chain

2 Big schools ：

• MATLAB + DaVinci（ Domestic mainstream , Reference books are 《 be based on AUTOSAR Standardized software development of vehicle motor controller 》）

• MATLAB + ETAS（ Bosch and liandian mainly use this , Reference books are 《AUTOSAR Specification and software development of vehicle controller 》）

• There is also a domestic company that does AutoSAR Development tools , It's called Hengrun

2. Learning materials

2.1 AutoSAR file

2.2 Chip manual

2.3 Automobile related standard agreement