結構體、指針、枚舉？有關于規范化和模塊化編程的例子，不解釋，你懂得

ID:71477 · 發表于 2015-1-1 23:51

自己寫的例子，MSP4305438 RTC程序，僅供參考：

本例子總共分三部分：

1 config.h文件，用于提供各種類型的簡稱，方便編寫代碼：

#ifndef __config_h__
#define __config_h__

typedef signed char             S8;
typedef signed int                S16;
typedef signed long             S32;
typedef unsigned char          U8;
typedef unsigned int             U16;
typedef unsigned long          U32;
typedef volatile signed char    VS8;
typedef volatile signed int    VS16;
typedef volatile signed long VS32;
typedef volatile unsigned char  VU8;
typedef volatile unsigned int VU16;
typedef volatile unsigned long VU32;
typedef const U8                FLASH;

typedef enum
{
FALSE = 0,
TRUE = !FALSE
} BOOL;
#endif

2.rtcReg.h文件，配置RTC物理層以及存儲RTC時間的結構變量

#ifndef __rtcReg_H
#define __rtcReg_H

#include "config.h"
#include "MSP430x54x.h"
typedef struct
{
VU16 RTCYEAR;
VU16 RTCMON;
VU16 RTCDOW;
VU16 RTCDAY;
VU16 RTCHOUR;
VU16 RTCMIN;
VU16 RTCSEC;
}RTC_RegisterDef;

typedef struct
{
VU16 Year;
VU16 Month;
VU16 DayOfWeek;
VU16 Day;
VU16 Hour;
VU16 Minute;
VU16 Second;
}RTC_TimerDef;

#define RTC_Delay2us _NOP();\
_NOP()

#define RTC_Delay1us _NOP()

/*----------------------------------------------------------------/
函數名:RTC_TimerInitial
參數：RTC相關寄存器結構體指針變量self,RTC時間變量結構體指針child
返回值：NULL
功能：初始化RTC寄存器結構體和RTC變量結構體相應都為0
/----------------------------------------------------------------*/
void RTC_TimerInitial(RTC_RegisterDef *self,RTC_TimerDef *child);

/*----------------------------------------------------------------/
函數名：RTC_TimerInfo
參數：RTC變量結構體指針，相應變量
返回值：NULL
功能：給RTC結構體中的相應變量賦值
/----------------------------------------------------------------*/
void RTC_TimerInfo(RTC_TimerDef *child,VU16 in_year,\
                                    VU16 in_month,\
                                    VU16 in_dow,\
                                    VU16 in_day,\
                                    VU16 in_hour,\
                                    VU16 in_min,\
                                    VU16 in_sec\
                                 );

/*----------------------------------------------------------------/
函數名：RTC_TimerSet
參數：RTC相關寄存器結構體指針變量self,RTC時間變量結構體指針child
返回值：NULL
功能：將RTC變量結構體中的相應變量值來設置RTC寄存器
/----------------------------------------------------------------*/
void RTC_TimerSet(RTC_RegisterDef *self,RTC_TimerDef *child);

/*----------------------------------------------------------------/
函數名：RTC_TimerGet
參數：RTC相關寄存器結構體指針變量self,RTC時間變量結構體指針child
返回值：NULL
功能：用RTC變量結構體指針child裝載讀取RTC寄存器指針中的相應值
/----------------------------------------------------------------*/
void RTC_TimerGet(RTC_RegisterDef *self,RTC_TimerDef *child);
#endif

3.RTC.c文件，用于主程序調用函數的編寫

#include "rtcReg.h"
void RTC_TimerInitial(RTC_RegisterDef *self,RTC_TimerDef *child)
{
_DINT();
RTC_Delay2us;
self->RTCYEAR = child->Year = 0;
RTC_Delay2us;
self->RTCMON = child->Month = 0;
RTC_Delay2us;
self->RTCDOW = child->DayOfWeek = 0;
RTC_Delay2us;
self->RTCDAY = child->Day = 0;
RTC_Delay2us;
self->RTCHOUR = child->Hour = 0;
RTC_Delay2us;
self->RTCMIN = child->Minute = 0;
RTC_Delay2us;
self->RTCSEC = child->Second = 0;
RTC_Delay2us;
_EINT();
}
void RTC_TimerInfo(RTC_TimerDef *child,VU16 in_year,\
                                    VU16 in_month,\
                                    VU16 in_dow,\
                                    VU16 in_day,\
                                    VU16 in_hour,\
                                    VU16 in_min,\
                                    VU16 in_sec\
                                 )
{
child->Year = in_year;
child->Month = in_month;
child->DayOfWeek = in_dow;
child->Day = in_day;
child->Hour = in_hour;
child->Minute = in_min;
child->Second = in_sec;
}

void RTC_TimerSet(RTC_RegisterDef *self,RTC_TimerDef *child)
{
_DINT();
RTC_Delay2us;
self->RTCYEAR = child->Year;
RTC_Delay2us;
self->RTCMON = child->Month;
RTC_Delay2us;
self->RTCDOW = child->DayOfWeek;
RTC_Delay2us;
self->RTCDAY = child->Day;
RTC_Delay2us;
self->RTCHOUR = child->Hour;
RTC_Delay2us;
self->RTCMIN = child->Minute;
RTC_Delay2us;
self->RTCSEC = child->Second;
RTC_Delay2us;
_EINT();
}

void RTC_TimerGet(RTC_RegisterDef *self,RTC_TimerDef *child)
{
RTC_Delay1us;
child->Year = self->RTCYEAR;
RTC_Delay1us;
child->Month = self->RTCMON;
RTC_Delay1us;
child->DayOfWeek = self->RTCDOW;
RTC_Delay1us;
child->Day = self->RTCDAY;
RTC_Delay1us;
child->Hour = self->RTCHOUR;
RTC_Delay1us;
child->Minute = self->RTCMIN;
RTC_Delay1us;
child->Second = self->RTCSEC;
RTC_Delay1us;
}

總結

為什么頭文件都定義好了物體層筆者還要去定義物理層呢？為什么要這樣頻繁的使用指針呢？

很簡單的回答這個問題主要有兩點原因：

1）節約系統內存和運行時間，具體筆者不解釋，你懂得

2）方便代碼升級，提高程序的可移植性，原因體現在rtcReg.h，具體筆者不解釋，如果你懂，我想你懂得。

最近一直試著把這幾年來的學習經歷轉化為文字，許多都是一些個人見解。若有不同意見，可留言探討。