Description

8-bit CRC (Cyclic Redundancy Check) calculator for checksums.

File(s):

A CRC is an error-detecting code that is used for data integrity checks.

See also: http://en.wikipedia.org/wiki/Cyclic_redundancy_check; https://crccalc.com

Macros
#define	PX_CRC8_POLYNOMIAL 0x07
	The generator polynomial CRC8 (normal representation): x^8 + x^2 + x + 1. More...

#define	PX_CRC8_INIT_VAL 0x00
	Initial CRC value. More...

#define	PX_CRC8_RAM_TABLE 0
	Generate table in RAM to speed up CRC calculation. More...

#define	PX_CRC8_ROM_TABLE 0
	Use table in ROM to speed up CRC calculation. More...

Functions
void	px_crc8_init (void)
	Initialise 8-bit CRC calculator. More...

uint8_t	px_crc8_update_u8 (uint8_t crc, uint8_t data)
	Calculate the 8-bit CRC over one byte. More...

uint8_t	px_crc8_update_data (uint8_t crc, const void *data, size_t nr_of_bytes)
	Calculate the 8-bit CRC over a number of bytes. More...

Macro Definition Documentation

◆ PX_CRC8_POLYNOMIAL

#define PX_CRC8_POLYNOMIAL 0x07

The generator polynomial CRC8 (normal representation): x^8 + x^2 + x + 1.

Definition at line 65 of file px_crc8.h.

◆ PX_CRC8_INIT_VAL

#define PX_CRC8_INIT_VAL 0x00

Initial CRC value.

Definition at line 67 of file px_crc8.h.

◆ PX_CRC8_RAM_TABLE

#define PX_CRC8_RAM_TABLE 0

Generate table in RAM to speed up CRC calculation.

Definition at line 34 of file px_crc8_cfg_template.h.

◆ PX_CRC8_ROM_TABLE

#define PX_CRC8_ROM_TABLE 0

Use table in ROM to speed up CRC calculation.

Definition at line 37 of file px_crc8_cfg_template.h.

Function Documentation

◆ px_crc8_init()

void px_crc8_init ( void )

Initialise 8-bit CRC calculator.

This function will initialise the table in RAM with constants to speed up CRC calculation. For other options it does nothing.

Definition at line 79 of file px_crc8.c.

◆ px_crc8_update_u8()

uint8_t px_crc8_update_u8	(	uint8_t	crc,
		uint8_t	data
	)

Calculate the 8-bit CRC over one byte.

Parameters

crc	The initial CRC to start the calculation with
data	The value to calculate the CRC over

Returns: uint8_t The resultant CRC

Definition at line 107 of file px_crc8.c.

◆ px_crc8_update_data()

uint8_t px_crc8_update_data	(	uint8_t	crc,
		const void *	data,
		size_t	nr_of_bytes
	)

Calculate the 8-bit CRC over a number of bytes.