55 lines
1.1 KiB
C++
55 lines
1.1 KiB
C++
/*
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* Copyright 2021 NXP
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* Copyright 2021 ACRIOS Systems s.r.o.
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* All rights reserved.
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*
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include "erpc_crc16.hpp"
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using namespace erpc;
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////////////////////////////////////////////////////////////////////////////////
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// Code
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////////////////////////////////////////////////////////////////////////////////
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Crc16::Crc16(uint32_t crcStart) : m_crcStart(crcStart) {}
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Crc16::Crc16(void) : m_crcStart(0xEF4A) {}
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Crc16::~Crc16(void) {}
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uint16_t Crc16::computeCRC16(const uint8_t *data, uint32_t lengthInBytes)
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{
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uint32_t crc = m_crcStart;
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uint32_t j;
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uint32_t i;
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uint32_t byte;
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uint32_t temp;
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const uint32_t andValue = 0x8000U;
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const uint32_t xorValue = 0x1021U;
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for (j = 0; j < lengthInBytes; ++j)
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{
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byte = data[j];
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crc ^= byte << 8;
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for (i = 0; i < 8U; ++i)
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{
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temp = crc << 1;
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if (0UL != (crc & andValue))
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{
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temp ^= xorValue;
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}
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crc = temp;
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}
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}
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return (uint16_t)crc;
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}
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void Crc16::setCrcStart(uint32_t crcStart)
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{
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m_crcStart = crcStart;
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}
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