crc_algs.c File Reference

Functions that perform the equivalent CRC16 and CRC32 to the hardware components. More...

#include "MAVRK_Arch.h"
#include "crc.h"

Functions
unsigned short	mvk_Make_Bitwise_Crc16 (unsigned short crc, unsigned short poly, unsigned char *pmsg, unsigned int msg_size)
	Perform a 16 bit CRC in software.
unsigned short	mvk_Make_Bitwise_Crc16_2 (unsigned short crc, unsigned short poly, unsigned char *pmsg, unsigned int msg_size)
	Perform a 16 bit CRC in software.
unsigned long	mvk_Make_Bitwise_Crc32 (unsigned long crc, unsigned long poly, unsigned char *pmsg, unsigned int msg_size)
	Perform a 32 bit CRC in software.
unsigned long	mvk_Make_Bitwise_Crc32_2 (unsigned long crc, unsigned long poly, unsigned char *pmsg, unsigned int msg_size)
	Perform a 32 bit CRC in software.

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Detailed Description

Functions that perform the equivalent CRC16 and CRC32 to the hardware components.

Author:

Emil Lenchak

Date:

March 2004

The software based CRC functions are designed to perform a CRC16 and CRC32 without the hardware engine. This allows micro-processors without a CRC engine to still create CRC values for message blocks.

There is also a C optimized version of each algorithm present in the file.

Note:

Prototypes for functions in this file are located in the crc.h header file located in the mavrk_embedded\Modular_EVM_Libraries\Algorithms\MSP430_CRC_16 directory

Warning:

These specific files are intended for calculating the CRC using a software algorithm with the processor. There exists identical function names for calculating the CRC using the hardware accelerator.

See also:

For Support: http://ti.com/mavrkquestions

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Function Documentation

unsigned short mvk_Make_Bitwise_Crc16	(	unsigned short	crc,
		unsigned short	poly,
		unsigned char *	pmsg,
		unsigned int	msg_size
	)

Perform a 16 bit CRC in software.

This function performs a 16 bit CRC on the data block using the polynomial provided.

Parameters:

[in]	crc	CRC init value
[in]	poly	CRC generator polynomial
[in]	*pmsg	Pointer to the block of data on which we will perform the CRC
[in]	msg_size	Number of bytes in the CRC data block

Returns:

16 bit CRC value

unsigned short mvk_Make_Bitwise_Crc16_2	(	unsigned short	crc,
		unsigned short	poly,
		unsigned char *	pmsg,
		unsigned int	msg_size
	)

Perform a 16 bit CRC in software.

This is a C optimized version of the algorithm that performs a 16 bit CRC on the data block using the polynomial provided.

Parameters:

[in]	crc	CRC init value
[in]	poly	CRC generator polynomial
[in]	*pmsg	Pointer to the block of data on which we will perform the CRC
[in]	msg_size	Number of bytes in the CRC data block

Returns:

16 bit CRC value

unsigned long mvk_Make_Bitwise_Crc32	(	unsigned long	crc,
		unsigned long	poly,
		unsigned char *	pmsg,
		unsigned int	msg_size
	)

Perform a 32 bit CRC in software.

This function performs a 32 bit CRC on the data block using the polynomial provided.

Parameters:

[in]	crc	CRC init value
[in]	poly	CRC generator polynomial
[in]	*pmsg	Pointer to the block of data on which we will perform the CRC
[in]	msg_size	Number of bytes in the CRC data block

Returns:

32 bit CRC value

unsigned long mvk_Make_Bitwise_Crc32_2	(	unsigned long	crc,
		unsigned long	poly,
		unsigned char *	pmsg,
		unsigned int	msg_size
	)

Perform a 32 bit CRC in software.

* This is a C optimized version of the algorithm that performs a 32 bit CRC on the data block using the polynomial provided.

Parameters:

[in]	crc	CRC init value
[in]	poly	CRC generator polynomial
[in]	*pmsg	Pointer to the block of data on which we will perform the CRC
[in]	msg_size	Number of bytes in the CRC data block

Returns:

32 bit CRC value