mxm_crc8.c File Reference

CRC8 calculation for Maxim Integrated Monitoring devices. More...

#include "general.h"
#include "mxm_crc8.h"
#include "fassert.h"
#include "fstd_types.h"
#include <stdint.h>

Include dependency graph for mxm_crc8.c:

Go to the source code of this file.

Functions
static uint8_t	MXM_CRC8WithInitValue (uint16_t *pData, int32_t lenData, uint8_t crcInit)
	Compute CRC8 (0xA6) with initial value. More...
uint8_t	MXM_CRC8 (uint16_t *pData, int32_t lenData)
	Compute CRC8 with initial value set to 0x00. More...
STD_RETURN_TYPE_e GEN_MUST_CHECK_RETURN	MXM_CRC8SelfTest (void)
	Test the CRC8-algorithm with a known pattern. More...

Detailed Description

CRC8 calculation for Maxim Integrated Monitoring devices.

Copyright

© 2010 - 2023, Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. All rights reserved.

SPDX-License-Identifier: BSD-3-Clause

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

We kindly request you to use one or more of the following phrases to refer to foxBMS in your hardware, software, documentation or advertising materials:

• ″This product uses parts of foxBMS®″
• ″This product includes parts of foxBMS®″
• ″This product is derived from foxBMS®″

Author

foxBMS Team

Date

2019-02-05 (date of creation)

Updated

2023-10-12 (date of last update)

Version

v1.6.0

Prefix

MXM

This module supports the calculation of a CRC8 based on the polynomial described in the Maxim data sheets. The polynomial is 0xA6.

Definition in file mxm_crc8.c.

Function Documentation

MXM_CRC8()

uint8_t MXM_CRC8	(	uint16_t *	pData,
		int32_t	lenData
	)

Compute CRC8 with initial value set to 0x00.

Computes the CRC8 for the given data with the given length with the polynomial 0xA6. This function calls MXM_CRC8WithInitValue() with CRC set to 0x00. The result should be 0x00 if you include the CRC into the datastream.

Parameters

[in]	pData	array-pointer with data to be cyclic redundancy checked
[in]	lenData	length of array

Returns

uint8_t containing the computed CRC

Definition at line 140 of file mxm_crc8.c.

Here is the call graph for this function:

MXM_CRC8SelfTest()

STD_RETURN_TYPE_e GEN_MUST_CHECK_RETURN MXM_CRC8SelfTest

(

void

)

Test the CRC8-algorithm with a known pattern.

Tests the CRC8-algorithm with known patterns and asserts that the implementation matches the required algorithm.

Returns

STD_OK if the selfcheck is successful and STD_NOT_OK otherwise

Definition at line 147 of file mxm_crc8.c.

Here is the call graph for this function:

MXM_CRC8WithInitValue()

static uint8_t MXM_CRC8WithInitValue ( uint16_t *  pData, int32_t  lenData, uint8_t  crcInit  )

static

Compute CRC8 (0xA6) with initial value.

Computes the CRC8 for the given data with the polynomial 0xA6.

Parameters

[in]	pData	array-pointer with data to be cyclic redundancy checked
[in]	lenData	length of array
[in]	crcInit	initial CRC-value

Returns

uint8_t containing the computed CRC

Precomputed CRC8-table for polynomial 0xA6

This array contains the precomputed results for the look-up-table-based computation of a CRC8 with polynomial 0xA6. The polynomial-number represents the coefficients of the polynomial like this: 8 7 6 5 4 3 2 1 0 1 0 1 0 0 1 1 0 1 --> 14D

This polynomial can also be called 0x14D according to the notation (0xA6 << 1).

Definition at line 87 of file mxm_crc8.c.