In-vehicle operating system: some differences between CP and AP!-EEWORLD

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The Classic Autosar platform supports high-security and high-real-time application scenarios, so deeply embedded software functions need to be deployed and run on the classic platform; while AdapTIve Autosar supports parallel processing of big data, so high-performance computing functions need to run on the AdapTIve platform.

AUTOSAR itself is a software architecture idea or a software framework system. AUTOSAR does not directly lock the code, but only makes unified specifications for the functions, interfaces and code frameworks of each layer. This achieves the decoupling of software and hardware and enhances the portability and platform nature of the overall system.

As the code framework and functions become more unified, there is gradually no need to type code manually. At the same time, for the sake of code consistency and maintainability, the Autosar system has given birth to code tools. That is, Autosar engineers no longer need to type all the code, but can use tools to generate it.

So today we will simply list some of the differences between CP and AP!

Classic Platform	AdapTIve platform
Support 8-bit, 16-bit, 32-bit microcontrollers (MCU), chip computing power is less than 1000DMIPS (flash space above 512KB is generally 1M)	Supports high-performance processors (MPU) and SoCs running on 64-bit high-computing platforms. The computing power is generally higher than 20,000 DMIPS. For high-computing chips, the computing power can reach dozens or hundreds of TOPS.
Embedded language is mainly C language	The programming language is C++
RTOS Real-time operating system——Based on OSEK Developed by various AUTOSAR basic software suppliers	Compatible with real-time and non-real-time operating systems - Based on POSIX, Linux, QNX, and Android are all supported
The OS uses a fixed task scheduling configuration and executes tasks in a fixed order according to established rules.	OS supports a variety of dynamic adjustment strategies, which are configured at runtime.
The task scheduling cycle can be at the us level, hard real-time system	The task scheduling cycle is at the ms level, which can be a soft real-time system at best, and a non-real-time system in some cases.
ASIL-D	ASIL-B
The PC pointer reads the code directly from the ROM and executes it	The code needs to be loaded into RAM first, and then the program is run in RAM
All applications have one executable file (elf), MPU memory protection unit, and use domain registers for protection management	Each application is a separate elf. The MMU memory management unit is more powerful than the MPU and is managed using virtual address mapping technology.
Signal-based static configuration communication mode, software development of FOA architecture (function-oriented architecture). At present, CP can also support service-based SOA architecture, but it needs to preset Ethernet interface (although SOME/IP can be integrated, it converts sender-receiver bus communication into client-server Ethernet communication)	Dynamic communication methods based on services (SOME/IP, IPC, RPC) can realize software development based on service-oriented architecture (SOA) and achieve parallel processing capabilities
Configuration before compilation, fixed functions, all applications are compiled and linked into a whole binary file, which is burned for use, so the upgrade process requires overall reintegration, compilation, and burning.	AP AUTOSAR is a modular framework that dynamically loads configuration from the Manifests file during runtime. It can delete/update/add a single Application, or upgrade the code of a functional cluster separately. The application software is compiled and deployed independently as an independent executable file, and the entire software system can be flexibly upgraded online.
Use step function, the step length is configurable, and time slice polling scheduling is adopted	Support dynamic scheduling strategies, which can change the scheduling timing and trigger conditions during operation
For scenarios with high real-time performance, high security and low computing power, such as engine control, braking system and other traditional ECUs	There are certain requirements for real-time and security, but they are not high. However, there are application scenarios with high computing power requirements, complex scenarios, and complex algorithm logic, such as domain controllers, smart cockpits, and intelligent driving domain controllers

QNX is recognized by the industry as one of the best embedded real-time operating systems on the X86 platform. It has a unique microkernel real-time platform, built on the basis of microkernel and complete address space protection, real-time, stable and reliable. It has completed the porting to PowerPC, MIPS, ARM and other kernels, and has become an embedded real-time operating system widely used in China. List important pages and add hyperlinks for quick viewing.

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