src/crc.c File Reference

#include "crc.h"

Include dependency graph for crc.c:

Defines
#define	WIDTH   (8 * sizeof(crc))
#define	TOPBIT   (1 << (WIDTH - 1))
#define	REFLECT_DATA(X)   ((unsigned char) reflect((X), 8))
#define	REFLECT_REMAINDER(X)   ((crc) reflect((X), WIDTH))
Functions
static unsigned long	reflect (unsigned long data, unsigned char nBits)
crc	crcSlow (unsigned char const message[], int nBytes)
void	crcInit (void)
crc	crcFast (unsigned char const message[], int nBytes)
unsigned char	generate_crc7 (unsigned char *buf, unsigned char bytes)
	Generate CRC7.
Variables
crc	crcTable [256]

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Define Documentation

#define REFLECT_DATA

(

X

)

((unsigned char) reflect((X), 8))

#define REFLECT_REMAINDER

(

X

)

((crc) reflect((X), WIDTH))

#define TOPBIT   (1 << (WIDTH - 1))

#define WIDTH   (8 * sizeof(crc))

---

Function Documentation

crc crcFast	(	unsigned char const	message[],
		int	nBytes
	)

void crcInit

(

void

)

crc crcSlow	(	unsigned char const	message[],
		int	nBytes
	)

unsigned char generate_crc7	(	unsigned char *	buf,
		unsigned char	bytes
	)

Generate CRC7.

This function generates a 7 bit CRC using the X^7 + X^3 + 1 polynomial

Parameters:

Parameters:

	buf	Pointer to the first data byte to be calculated
	bytes	Total number of bytes to be included in crc calculation

Returns:

7 bit CRC value

static unsigned long reflect	(	unsigned long	data,
		unsigned char	nBits
	)			[static]

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Variable Documentation

crc crcTable[256]

---