AUTOSAR-like MCU Driver
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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 provided start-up code description in this document is for guidance and implies functionality which has to be taken into account before standardized MCU initialization is able to start. The start-up code is provided by Evidence Srl within Erika Enterprise.
The MCU driver accesses the microcontroller hardware directly and is located in the Microcontroller Abstraction Layer.
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
Configuration
Compiling
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