foxBMS  1.6.0
The foxBMS Battery Management System API Documentation
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>
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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.

SPDX-License-Identifier: BSD-3-Clause

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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]pDataarray-pointer with data to be cyclic redundancy checked
[in]lenDatalength of array
Returns
uint8_t containing the computed CRC

Definition at line 140 of file mxm_crc8.c.

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◆ 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.

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◆ 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]pDataarray-pointer with data to be cyclic redundancy checked
[in]lenDatalength of array
[in]crcInitinitial 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.