原创 C51头文件的包含

在头文件的声明中，不可重复的包含一个文件如下，I2C.h文件与LCD.h文件就会产生冲突，因为都包含了头文件reg52.h

(1)I2C.h头文件的定义：

#ifndef _I2C_H_
#define _I2C_H_

#include <reg52.h>

//定义I2C总线时钟的延时值，要根据实际情况修改，取值1～255
//SCL信号周期约为(I2C_DELAY_VALUE*4+15)个机器周期
#define I2C_DELAY_VALUE  12

//定义I2C总线停止后在下一次开始之前的等待时间，取值1～65535
//等待时间约为(I2C_STOP_WAIT_VALUE*8)个机器周期
//对于多数器件取值为1即可；但对于某些器件来说，较长的延时是必须的
#define I2C_STOP_WAIT_VALUE 120

//I2C总线初始化，使总线处于空闲状态
void I2C_Init();
void I2C_Init1();
void I2C_Init2();
void I2C_Init3();
//I2C总线综合发送函数，向从机发送多个字节的数据
bit I2C_Puts
(
 unsigned char SlaveAddr,
 unsigned int SubAddr,
 unsigned char SubMod,
 char *dat,
 unsigned int Size
);
bit I2C_Puts1
(
 unsigned char SlaveAddr,
 unsigned int SubAddr,
 unsigned char SubMod,
 char *dat,
 unsigned int Size
);
bit I2C_Puts2
(
 unsigned char SlaveAddr,
 unsigned int SubAddr,
 unsigned char SubMod,
 char *dat,
 unsigned int Size
);
bit I2C_Puts3
(
 unsigned char SlaveAddr,
 unsigned int SubAddr,
 unsigned char SubMod,
 char *dat,
 unsigned int Size
);
//I2C总线综合接收函数，从从机接收多个字节的数据
bit I2C_Gets
(
 unsigned char SlaveAddr,
 unsigned int SubAddr,
 unsigned char SubMod,
 char *dat,
 unsigned int Size
);
bit I2C_Gets1
(
 unsigned char SlaveAddr,
 unsigned int SubAddr,
 unsigned char SubMod,
 char *dat,
 unsigned int Size
);
bit I2C_Gets2
(
 unsigned char SlaveAddr,
 unsigned int SubAddr,
 unsigned char SubMod,
 char *dat,
 unsigned int Size
);
bit I2C_Gets3
(
 unsigned char SlaveAddr,
 unsigned int SubAddr,
 unsigned char SubMod,
 char *dat,
 unsigned int Size
);

#endif //_I2C_H_

(2)LCD.h头文件的定义：

#ifndef _LCD_H_

#include<intrins.h>
#include <reg52.h>      
#include <absacc.h>
#include <ctype.h>
#define Uchar unsigned char
#define Uint unsigned int
#define Busy 0x80       // 忙判别位

void Checkbusy1();                                              //读取忙标志函数
void Checkbusy2();
 void LcdWriteCommand1( Uchar CMD1,Uchar AttribC1);              //写控制字
void LcdWriteCommand2( Uchar CMD2,Uchar AttribC2);
void LcdWriteData1( char dataW1);                                //写数据
void LcdWriteData2( char dataW2);
void LocateXY1( char posx1,char posy1);                           //显示光标定位
void LocateXY2( char posx2,char posy2);
void DispOneChar1(Uchar x1,Uchar y1,Uchar Wdata1);               //在光标指定位置写一字符
void DispOneChar2(Uchar x2,Uchar y2,Uchar Wdata2);
void ePutstr1(Uchar x1,Uchar y1, Uchar code *ptr1);             //在光标指定位置开始写字符串
void ePutstr2(Uchar x2,Uchar y2, Uchar code *ptr2);
void setCGRAM2(void);                                           //设置CGRAM地址
void displaydata2(void);                                        //显示年月日
void LcdReset1( void );
void LcdReset2( void ); 
void Delay(unsigned int t);

#endif

当然在每个对应的.C文件都用到了C51中的reg52的特殊寄存器，如P1，P2。两个文件在主程序中都要用到，既在主程序中要包含两个头文件，I2C.h,LCD.h。此时会提示出错。

可将LCD.h中的第三行改为#include <I2C.h>，这样就解决了同时包含 reg52.h的问题。