原创 基于相互关联的数据结构的技巧定义

 最近在开发项目中，涉及到多维相关联常量表。基于传统的直接的方法就是多维常量表。

比如我们定义多维的向量表:

/* (name, mask, code, persistence, sympt, enlamp, fault_type */

XX_TAB[]={

   "A1_NUMB", 0X0001, 0X9567,DTC_FAIL, SYSTEMFAIL, LAMP_ON，SYS_TYPE,

  "A2_NUMB",0X00020,0X9568,DTC_SYSFAIL,SYSTEMSENSORFAIL,LAMP_ON,SENSOR_TYPE,

  "A3_NUMB",0X0040,0X9578,DTC_LRSENSOR,SYSSENSORFAIL,LAMP_ON,SENSOR_TYPE

 }；

这里笔者发现一种简洁的构造表达的方法：

我们分三步来实现表达：

1。先建立 一个列表文件：FL_list.h

/****************************************************************************

 * File        : FL_list.h

 * Project     : 

 * Description  :   Fault Enum, code and mask defined.

 * Copyright   :

 ***************************************************************************/ 

 #ifdef FAULT_ENUM

  #define FAULT(name, mask, code, persistence, sympt, enlamp, fault_type)   \

                                                                                                                       name##_ENUM,

 #endif 

 #ifdef FAULT_MASK

  #define FAULT(name, mask, code, persistence, sympt, enlamp, fault_type)    \

                                                                                                                       (unsigned long)mask,

 #endif

 #ifdef FAULT_CODE

  #define FAULT(name, mask, code, persistence, sympt, enlamp, fault_type)    \

                                                                                                                       (unsigned short)code,

 #endif

 #ifdef FAULT_RETAIN

  #define FAULT(name, mask, code, persistence, sympt, enlamp, fault_type)     \

                                                                                                                       (unsigned char)persistence,

 #endif

 #ifdef FAULT_SYMPT

  #define FAULT(name, mask, code, persistence, sympt, enlamp, fault_type)     \

                                                                                                                       (unsigned char)sympt,

 #endif

  #ifdef FAULT_ENLAMP

  #define FAULT(name, mask, code, persistence, sympt, enlamp, fault_type)      \

                                                                                                                       (unsigned char)enlamp,

 #endif

 #ifdef FAULT_TYPE

  #define FAULT(name, mask, code, persistence, sympt, enlamp, fault_type)      \

                                                                                                                       (unsigned char)fault_type,

 #endif

 /*1*/FAULT( BATTERY_LOW,  0x00000002, 0x5406, DTC_NOT_PERSISTENT, DTC_BELOW_MIN_THRESHOLD,     DTC_TPMS_LAMP_ON, FLT_SYS                                  )

 /*2*/FAULT( BATTERY_HIGH,     0x00000004, 0x5407, DTC_NOT_PERSISTENT, DTC_ABOVE_MAX_THRESHOLD, DTC_TPMS_LAMP_ON, FLT_SYS                                  )

 /*3*/FAULT( SELF_CHECK,  0x00000008, 0x5800, DTC_NOT_PERSISTENT, DTC_INVALID_SIGNAL, DTC_TPMS_LAMP_ON, FLT_SYS                                )

 /*4*/FAULT( SENSOR_NOT_CALIBRATED,    0x00000010, 0x5802, DTC_NOT_PERSISTENT, DTC_INVALID_SIGNAL, DTC_TPMS_LAMP_ON, FLT_SYS      )

 /*5*/FAULT( EEPROM_CHECKSUM_FAILURE, 0x00000010, 0x5801, DTC_NOT_PERSISTENT, DTC_INVALID_SIGNAL, DTC_TPMS_LAMP_ON, FLT_SYS                                  )

 /*6*/FAULT( SENSOR_FL_BATTERY_LOW,  0x00010000, 0x5807, DTC_PERSISTENT, DTC_BELOW_MIN_THRESHOLD, DTC_TPMS_LAMP_ON, FLT_FL_SENSOR         )

 /*7*/FAULT( SENSOR_FR_BATTERY_LOW,  0x00010000, 0x5808, DTC_PERSISTENT, DTC_BELOW_MIN_THRESHOLD, DTC_TPMS_LAMP_ON, FLT_FR_SENSOR         )

 /*8*/FAULT( SENSOR_RL_BATTERY_LOW,  0x00010000, 0x5809, DTC_PERSISTENT, DTC_BELOW_MIN_THRESHOLD, DTC_TPMS_LAMP_ON, FLT_RL_SENSOR         )

 /*9*/FAULT( SENSOR_RR_BATTERY_LOW,  0x00010000, 0x5810, DTC_PERSISTENT, DTC_BELOW_MIN_THRESHOLD, DTC_TPMS_LAMP_ON, FLT_RR_SENSOR        )

 /*10*/FAULT( SENSOR_FL_NOT_TRANSMITTING, 0x00020000, 0x5803, DTC_PERSISTENT, DTC_NOT_TRANSMITTING, DTC_TPMS_LAMP_ON, FLT_FL_SENSOR         )

 /*11*/FAULT( SENSOR_FR_NOT_TRANSMITTING, 0x00020000, 0x5804, DTC_PERSISTENT, DTC_NOT_TRANSMITTING, DTC_TPMS_LAMP_ON, FLT_FR_SENSOR         )

 /*12*/FAULT( SENSOR_RL_NOT_TRANSMITTING, 0x00020000, 0x5805, DTC_PERSISTENT, DTC_NOT_TRANSMITTING, DTC_TPMS_LAMP_ON, FLT_RL_SENSOR         )

 /*13*/FAULT( SENSOR_RR_NOT_TRANSMITTING, 0x00020000, 0x5806, DTC_PERSISTENT, DTC_NOT_TRANSMITTING, DTC_TPMS_LAMP_ON, FLT_RR_SENSOR        )

 #undef FAULT /*(name, mask, code, persistence, sympt, enlamp, fault_type) 

 #undef FAULT_ENUM

 #undef FAULT_MASK

 #undef FAULT_CODE

 #undef FAULT_RETAIN

 #undef FAULT_SYMPT

 #undef FAULT_ENLAMP

 #undef FAULT_TYPE

/******************************End of File**********************************/

2。 头文件定义引用的常量

  在另外的头文件内，这样定义引用

使用一个采用符号的枚举变量来定位索引，便于后面的数据结构的定位：

typedef enum
{
   #define   FAULT_ENUM
   #include "FL_list.h"
} T_FAULT;

这里通过采用枚举变量类型定义，多维数组通过常量变量实现了数组的偏移定位，同时达到名字易于理解的目的。

3。 原代码内定义常量数组

#define NUMBER_OF_DTC      13

 static const uint32 FLT_u32MaskArray [NUMBER_OF_DTC] =
{
   #define   FAULT_MASK
   #include "fault_list.h"
};

static const uint8 FLT_u8FaultType [NUMBER_OF_DTC] =
{
   #define   FAULT_TYPE
   #include "fault_list.h"
};

const uint8 FLT_u8Persistence [NUMBER_OF_DTC] =

{

   #define   FAULT_RETAIN

   #include "fault_list.h"

};

const uint8 FLT_u8Symptom [NUMBER_OF_DTC] =

{

   #define   FAULT_SYMPT

   #include "fault_list.h"

};

const uint8 FLT_u8EnLamp [NUMBER_OF_DTC] =

{

   #define   FAULT_ENLAMP

   #include "fault_list.h"

};

这里，可以看到我们通过T_FAULT 枚举常量，可以定位后面的 FLT_u32MaskArray ，FLT_u8FaultType 等常量。

程序的引用采用与实际表示的对象对应。简单，明了。