AUTOSAR-like MCU Driver

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Contents

Synopsis

The MCU driver provides services for basic microcontroller initialization, power down functionality, reset and microcontroller specific functions required by other MCAL [Microcontroller Abstraction Layer] software modules. The initialization services allow a flexible and application related MCU initialization in addition to the start-up code (see figure below). The start-up code is very MCU specific. The start-up code is provided by Evidence Srl within Erika Enterprise.

Startup Code.png

MCU driver Features:

  • Initialization of MCU clock, PLL, clock prescalers and MCU clock distribution
  • Initialization of RAM sections
  • Activation of μC reduced power modes
  • Activation of a μC reset
  • Provides a service to get the reset reason from hardware

The MCU driver accesses the microcontroller hardware directly and is located in the Microcontroller Abstraction Layer.

File Structure

MCU Driver File structure.png

Configuration

Build

To enable AUTOSAR-like MCU Driver in Erika Enterprise compiler toolchain, the following EE_OPT attribute is needed in the OS object of the OSEK/VDX configuration:

 EE_OPT = "__AS_MCU_DRIVER__";

The configuration C header file inclusion is done by CFLAGS attribute in the OS object of the OSEK/VDX configuration:

 CFLAGS = "-I<PATH>";

Where <PATH> is the absolute or relative directory path which configuration C header file is stored.

Instead the configurations C source file is added to the compilation process by APP_SRC attribute in the CPU_DATA object of the OSEK/VDX configuration:

 APP_SRC = "<PATH>/Mcu_Cfg.c";

Where <PATH> is the absolute or relative directory path which configuration C source file is stored.

Usage

Examples

Usage examples of the AUTOSAR-like MCU Driver for can be found at examples/cortex_mx/lm4f232xxxx/as

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