文章目录

计算CRC16的C语言包

本文博客链接:http://blog.csdn.net/jdh99,作者:jdh,转载请注明.

介绍

查表法计算crc 16。模型是CRC-16/MODBUS，多项式是8005。

开源

API

// Crc16ReadByteFunc read byte for crc16 calculate
typedef uint8_t (*Crc16ReadByteFunc)(int offset);

// Checksum check sum.Module is CRC-16/MODBUS,polynomial is 8005
// return value is MSB
uint16_t Checksum(uint8_t* bytes, int size);

// ChecksumFromCallback check sum,read data from callback function then calculate
// This function can use calculate crc when data in flash or file
// Module is CRC-16/MODBUS,polynomial is 8005
// return value is MSB
uint16_t ChecksumFromCallback(Crc16ReadByteFunc readByte, int size);

测试

测试框架使用的是适合于嵌入式系统的C语言单元测试框架:Scunit

#include <stdio.h>
#include "crc16.h"
#include "scunit.h"

static void testCheckSum(void);
static void testCheckSumFromCallback(void);
static uint8_t readData(int offset);

int main() {
    ScunitLoad((ScunitPrintFunc)printf);
    ScunitAddSuite("test crc16");
    ScunitAddTest("testCheckSum", testCheckSum);
    ScunitAddTest("testCheckSumFromCallback", testCheckSumFromCallback);
    return 0;
}

static void testCheckSum(void) {
    uint8_t arr1[] = {1, 2, 3};
    uint16_t crc = Checksum(arr1, 3);
    ScunitAssert(crc == 0x6161, "1");

    uint8_t arr2[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
    crc = Checksum(arr2, 9);
    ScunitAssert(crc == 0x0eb2, "2");
}

static void testCheckSumFromCallback(void) {
    uint16_t crc = ChecksumFromCallback(readData, 9);
    ScunitAssert(crc == 0x0eb2, "2");
}

static uint8_t readData(int offset) {
    static uint8_t arr[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
    return arr[offset];
}

输出:

Suite:test crc16
-------------------->case:testCheckSum begin
testCheckSum tag:1 SCUNIT_ASSERT pass
testCheckSum tag:2 SCUNIT_ASSERT pass
-------------------->case:testCheckSum end

-------------------->case:testCheckSumFromCallback begin
testCheckSumFromCallback tag:2 SCUNIT_ASSERT pass
-------------------->case:testCheckSumFromCallback end

源码

最新代码请查看github/gitee仓库。

crc16.h

// Copyright 2019-2021 The jdh99 Authors. All rights reserved.
// Look-up tables to implement crc16.Module is CRC-16/MODBUS,polynomial is 8005
// Authors: jdh99 <jdh821@163.com>

#ifndef CRC16_H
#define CRC16_H

#include <stdint.h>

// Crc16ReadByteFunc read byte for crc16 calculate
typedef uint8_t (*Crc16ReadByteFunc)(int offset);

// Checksum check sum.Module is CRC-16/MODBUS,polynomial is 8005
// return value is MSB
uint16_t Checksum(uint8_t* bytes, int size);

// ChecksumFromCallback check sum,read data from callback function then calculate
// This function can use calculate crc when data in flash or file
// Module is CRC-16/MODBUS,polynomial is 8005
// return value is MSB
uint16_t ChecksumFromCallback(Crc16ReadByteFunc readByte, int size);

#endif

crc16.c

// Copyright 2019-2021 The jdh99 Authors. All rights reserved.
// look-up tables to implement crc16.module is CRC-16/MODBUS polynomial is 8005
// Authors: jdh99 <jdh821@163.com>

#include "crc16.h"

static const uint8_t crcHi[] = {
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
    0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
    0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
    0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
    0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
    0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1,
    0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40
};

static const uint8_t crcLo[] = {
    0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06,
    0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD,
    0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,
    0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A,
    0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC, 0x14, 0xD4,
    0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
    0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3,
    0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4,
    0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A,
    0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29,
    0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED,
    0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
    0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60,
    0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67,
    0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F,
    0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68,
    0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E,
    0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
    0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71,
    0x70, 0xB0, 0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92,
    0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,
    0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B,
    0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B,
    0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
    0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42,
    0x43, 0x83, 0x41, 0x81, 0x80, 0x40
};

// Checksum check sum.Module is CRC-16/MODBUS,polynomial is 8005
// return value is MSB
uint16_t Checksum(uint8_t* bytes, int size) {
    uint8_t crcH = 0xFF;
    uint8_t crcL = 0xFF;
    uint8_t index = 0;

    for (int i = 0; i < size; i++) {
        index = crcH ^ bytes[i];
        crcH = crcL ^ crcHi[index];
        crcL = crcLo[index];
    }

    return (uint16_t)(((uint16_t)(crcH) << 8) | (uint16_t)(crcL));
}


// ChecksumFromCallback check sum,read data from callback function then calculate
// This function can use calculate crc when data in flash or file
// Module is CRC-16/MODBUS,polynomial is 8005
// return value is MSB
uint16_t ChecksumFromCallback(Crc16ReadByteFunc readByte, int size) {
    uint8_t crcH = 0xFF;
    uint8_t crcL = 0xFF;
    uint8_t index = 0;

    for (int i = 0; i < size; i++) {
        index = crcH ^ readByte(i);
        crcH = crcL ^ crcHi[index];
        crcL = crcLo[index];
    }

    return (uint16_t)(((uint16_t)(crcH) << 8) | (uint16_t)(crcL));
}
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