TECH ARTICLE

EB tresos Classic AUTOSAR：
MCAL Module Training

Explore the lowest layer of the AUTOSAR software architecture, MCAL, understanding its definition, main driver categories, and graphical configuration mechanisms to achieve hardware abstraction.

This article is based on the video content of 'EB tresos Classic AUTOSAR-MCAL Module Basic Training' provided by Elektrobit. The video introduces the definition, structure, configuration, and update principles of MCAL in the AUTOSAR software architecture, helping developers understand and implement standardization and modularization of vehicle network communication design, thereby making the creation, design, and implementation of specific ECU functions easier.

1. Definition and Positioning of MCAL

MCAL (Microcontroller Abstraction Layer) It is the lowest layer in the Basic Software (BSW). It interacts directly with the Microcontroller (MCU) registers and is the only layer highly dependent on hardware.

  • target Core Objectives:Encapsulates MCU hardware functions (like pins, timers, communication interfaces) into standardized APIs.
  • diamond Significance:This frees upper-layer software (like the application layer or other BSW modules) from worrying about the specific details of chip registers, thereby achieving high software portability across different chip platforms.

2. Main Driver Categories in MCAL

The video divides internal MCAL modules into four main categories, covering all essential hardware operations required for ECU execution:

memory A. Microcontroller Drivers

  • MCU Module:Responsible for clock setting (PLL), Reset, and power management.
  • GPT Module (General Purpose Timer):Provides general timing functions.
  • Wdg Module (Watchdog):Manages the hardware watchdog to prevent program runaway.

settings_input_component B. I/O Drivers

  • PORT Module:Responsible for Pin Muxing configuration, defining whether each pin is an input, output, or special communication function.
  • DIO Module (Digital I/O):Read and write high/low levels on general-purpose digital pins.
  • ADC Module:Converts analog signals to digital values.
  • PWM Module:Outputs Pulse Width Modulation signals (commonly used for controlling motors or lights).

router C. Communication Drivers

CAN, LIN, SPI, FlexRay, Eth：These modules interact with the communication controllers inside the microcontroller and provide a unified data transmission interface for the upper communication stack.

save D. Memory Drivers

FLS Module (Flash Driver):Provides erase and write operations for internal or external Flash memory.

3. MCAL Configuration Mechanism

In EB tresos Studio, MCAL development is not 'handwriting drivers', but through 'Graphical Configuration」：

1
Import Chip Software Package Import the corresponding MCAL delivery package based on the hardware used (e.g., Infineon Aurix, NXP S32K, etc.).
2
Hardware Resource Allocation Configure each pin's function, CAN bus baud rate, and timer period within the tool.
3
Code Generation The C code generated by the tool based on the configuration directly operates the chip's registers.

4. Key Concepts: Static Configuration and Standardization

lock Static Properties

Most MCAL parameters are determined during the configuration phase, ensuring a high degree of determinism when the system is running.

api API Unification

Regardless of which vendor provides the underlying chip, the upper layers call Can_Write() or Dio_ReadChannel() methods are consistent. This is also why automakers can easily change controller suppliers.

This article summarizes the core role of MCAL as a hardware 'translator'. It is the physical support point of the entire AUTOSAR architecture.

Tutorial Video

play_circle Watch the full video on Bilibili