notation.h

基于51的单片机的PPP协议实现

#ifndef __NOTATION_H
#define __NOTATION_H	1

#define BIG_ENDIAN

#if defined(BIG_ENDIAN)

#define htons(A)	(A)
#define htonl(A)	(A)
#define ntohs(A)	(A)
#define ntohl(A)	(A)

#elif defined(LITTLE_ENDIAN)

#define htons(A)	((((A) & 0xFF00) >> 8) | \
			 (((A) & 0x00FF) << 8))

#define htonl(A)	((((A) & 0xFF000000) >> 24) | \
			 (((A) & 0x00FF0000) >> 8) | \
			 (((A) & 0x0000FF00) << 8) | \
			 (((A) & 0x000000FF) << 24))

#define ntohs	htons
#define ntohl	htohl

#else

#error "User Must define LITTLE_ENDIAN or BIG_ENDIAN!!!"

#endif


#define DWORD unsigned long
#define BYTE unsigned char
#define WORD unsigned int

#define False 0
#define True  1

typedef void (*EventProc)(BYTE c);

typedef struct {
	unsigned char	b0;
	unsigned char	b1;
	unsigned char	b2;
	unsigned char	b3;
	unsigned char	b4;
	unsigned char	b5;
	unsigned char	b6;
	unsigned char	b7;
} TByteBits;

typedef union {
	unsigned char	Value;
	TByteBits	Bits;
} TByte;

#define AppLoop	while(1)

#define	EnableInterrupts	_asm("CLI\n");  //Enable interrupts
#define DisableInterrupts	_asm("SEI\n");  //Enable interrupts
#define NoOperation		_asm("NOP\n");	// No operation 
	
#endif