嵌入式系统通用驱动程序接口及其实现-EERPOM存取位置标准化(视频教学时的同步输入文件)

嵌入式系统通用驱动程序接口及其实现-EERPOM存取位置标准化

存储单元 结构

保存永久性数据 每次读 写位置 要一致 才能恢复

• flash 程序存储器宽间
• RAM 空间
• EEPROM空间 由我们决定的。
  编译器所决定的

---

LED控制器

LedCtrler.h:

struct _LedCtrlerInfo{
  unsigned char DispMode,
  unsigned char FlashCount
  unsigned char OnCount;
  unsigned char OfCount;
  .
  .
  .
  .
};

Struct _LedCtrler{
  struct _LedCtrlerInfo Info;
  unsigend char a;
  unsigned char b;
  .
  .
  .
};

Sen.h //亮度传感器模块：

   struct _SenInfo{
     unsigned short Zero;
     unsigned short Gain;
   };

  struct _Sen{
    struct _SenInfo Info;
      unsigend char a;
      unsigned char b;
      .
      .
      .

  };

传统做法： InfoBase.h
//EEPROM初始化标志
#define INFO_BASE_INIT_FLAG_ADR 0x0000
#define INFO_BASE_INIT_FLAG_LEN 1
//应用相关：LED_CTRLER_INFO
#define INFO_BASE_LED_CTRLER_INFO_ADR (INFO_BASE_INIT_FLAG_ADR + INFO_BASE_INIT_FLAG_LEN)
#define INFO_BASE_LED_CTRLER_INFO_LEN 8
//应用相关：SEN_INFO
#define INFO_BASE_SEN_INFO_ADR (INFO_BASE_LED_CTRLER_INFO_ADR + INFO_BASE_LED_CTRLER_INFO_LEN)
#define INFO_BASE_SEN_INFO_LEN 8
.
.

---

换一种思路，解决这个问题：

• 并不关心，放在那个位置，需要的的：从那儿写，从那儿读回来

• 能否让编译器像flash RAM一样，让系统帮我们分配：固定

  define struct_offset(type, member)

  unsigned long Adr = struct_offset(struct _LedCtrlerInfo, OnCount);
  //编译器结果： Adr = 2;

*struct_offset 原理：
typedef struct _type{
member0; //0位置
member1; //1位置
.
.
.
memberN;
}type;

   type A;  //flash分配空间（自动）  0X50
   type *a = &A;  //a = 0x50;
   a->member1 = ？？ //&a->member1 地址 0x51
   unsigend char memberOffset = (char*)(&a->member1)- (char*)a  = 0x51 - 0x50;

#define struct_offset(type,member) \
  (unsigned int)(&(((type) *)0)->(member)))

Infobase_LedCtrler_V100.h 实现：

    //整个EEProm空间
    struct _LedCtrlerInfo_Ini{
      unsigned char Reversed[8];
    }
    struct _SenInfo_Ini{
      unsigned char Reversed[8];
    }

    typedef struct _InfoBase{
     unsigned char InitFlag;
     struct _LedCtrlerInfo_Ini LedCtrlerInfo;  //4存储空间 ->预留8个空间
     struct _SenInfo_ini SenInfo;  //4个空间

    }InfoBase_t;

    #define InfoBase_GetLedCtrlerInfo() struct_offset(InfoBase_t, LedCtrlerInfo);

    #define InfoBase_GetSenInfo() struct_offset(InfoBase_t,SenInfo);

Infobase_LedCtrler_V200.h 实现：
略

Infobase.h实现：
#ifdef HW_V100
#inlude “Infobase_LedCtrler_V100.h”
#endif

  #ifdef HW_V200
    #inlude "Infobase_LedCtrler_V200.h"
  #endif