buffer.h

AVRMEG32编写的一个项目代码,里面包含一般应用的模块.

/*! \file buffer.h \brief Multipurpose byte buffer structure and methods. */
//*****************************************************************************
//
// File Name	: 'buffer.h'
// Title		: Multipurpose byte buffer structure and methods
// Created		: 
// Revised		: 
// Version		: 1.0
// Target MCU	: any
// Editor Tabs	: 4
//
//*****************************************************************************
//@{

#ifndef BUFFER_H
#define BUFFER_H
// structure/typdefs
//! cBuffer structure
typedef struct struct_cBuffer
{
	unsigned char *dataptr;			///< the physical memory address where the buffer is stored
	unsigned short size;			///< the allocated size of the buffer
	unsigned short datalength;		///< the length of the data currently in the buffer
	unsigned short dataindex;		///< the index into the buffer where the data starts
} cBuffer;

// function prototypes

//! initialize a buffer to start at a given address and have given size
void bufferInit(cBuffer* buffer, unsigned char *start, unsigned short size);

//! get the first byte from the front of the buffer
unsigned char	bufferGetFromFront(cBuffer* buffer);

//! dump (discard) the first numbytes from the front of the buffer
void bufferDumpFromFront(cBuffer* buffer, unsigned short numbytes);

//! get a byte at the specified index in the buffer (kind of like array access)
// ** note: this does not remove the byte that was read from the buffer
unsigned char	bufferGetAtIndex(cBuffer* buffer, unsigned short index);

//! add a byte to the end of the buffer
unsigned char	bufferAddToEnd(cBuffer* buffer, unsigned char data);

//! check if the buffer is full/not full (returns non-zero value if not full)
unsigned char	bufferIsNotFull(cBuffer* buffer);

//! flush (clear) the contents of the buffer
void			bufferFlush(cBuffer* buffer);

//! get the data length in buffer
unsigned short	bufferGetDataLength(cBuffer* buffer);

#endif
//@}