AUTOSAR中MemMap

内存映射（MemMap）

头文件

原理：利用#if #elif #ifndef #undef #pragma（将源代码中的字符串编码直接转换为编译指令）进行条件编译

以一个BSW模块DCM的内存映射为例：
1. Dcm_MemMap.h

/** @file     Dcm_MemMap.h
  *
  * @brief    RTE Sample SWC MemMap file
  *
  * @note     AUTOMATICALLY GENERATED FILE! DO NOT EDIT!
  *
  */
#if defined (START_WITH_IF)
#elif defined(Dcm_START_SEC_CODE)
#undef Dcm_START_SEC_CODE
#define RTE_START_SEC_APPL_CODE
#elif defined(Dcm_STOP_SEC_CODE)
#undef Dcm_STOP_SEC_CODE
#define RTE_STOP_SEC_APPL_CODE

#endif /* START_WITH_IF */

#include "Rte_MemMap.h"

嵌套include了 Rte_MemMap.h

2. Rte_MemMap.h

/** \file         Rte_MemMap.h
  *
  * \brief        RTE Memory Mapping header file
  *
  * \note         Implemented SWS: N/A
  *
  * \note         PLATFORM DEPENDANT [yes/no]: no
  *
  * \note         TO BE CHANGED BY USER [yes/no]: yes
  *
  */
#ifndef RTE_MEMMAP_H_   //避免重复定义
#define RTE_MEMMAP_H_

#include "MemMap.h"
#endif /* RTE_MEMMAP_H_ */

再一次嵌套include了 MemMap.h

3 MemMap.h

/*----------------------------------------------------------------------------*/
/************** *SAMPLE* of MemMap.h. Not for production purposes *************/
/*----------------------------------------------------------------------------*/
#define MEM_VENDOR_ID        (11U)
#define MEM_AR_MAJOR_VERSION (4U)
#define MEM_AR_MINOR_VERSION (0U)
#define MEM_AR_PATCH_VERSION (3U)
#define MEM_SW_MAJOR_VERSION (5U)
#define MEM_SW_MINOR_VERSION (6U)
#define MEM_SW_PATCH_VERSION (3U)

/*******************************************************************************
**                      Default section mapping                               **
*******************************************************************************/

#if defined (START_WITH_IF)
/* -------------------------------------------------------------------------- */
/* RAM variables not initialized                                              */
/* -------------------------------------------------------------------------- */
#elif defined (DEFAULT_START_SEC_VAR_NOINIT_BOOLEAN)
  #undef      DEFAULT_START_SEC_VAR_NOINIT_BOOLEAN
#elif defined (DEFAULT_STOP_SEC_VAR_NOINIT_BOOLEAN)
  #undef      DEFAULT_STOP_SEC_VAR_NOINIT_BOOLEAN

#elif defined (DEFAULT_START_SEC_VAR_NOINIT_8BIT)
  #undef      DEFAULT_START_SEC_VAR_NOINIT_8BIT
#elif defined (DEFAULT_STOP_SEC_VAR_NOINIT_8BIT)
  #undef      DEFAULT_STOP_SEC_VAR_NOINIT_8BIT

#elif defined (DEFAULT_START_SEC_VAR_NOINIT_16BIT)
  #