详述CRC校验码（附代码）-面包板社区
Wed Jan 04 2023 09:21:02 GMT+0000 (Coordinated Universal Time)
Saved by @leawoliu
/*
*一口Linux
*2021.6.21
*version: 1.0.0
*/
#include "crc.h"
#include <stdio.h>
typedef enum {
REF_4BIT = 4,
REF_5BIT = 5,
REF_6BIT = 6,
REF_7BIT = 7,
REF_8BIT = 8,
REF_16BIT = 16,
REF_32BIT = 32
}REFLECTED_MODE;
uint32_t ReflectedData(uint32_t data, REFLECTED_MODE mode)
{
data = ((data & 0xffff0000) >> 16) | ((data & 0x0000ffff) << 16);
data = ((data & 0xff00ff00) >> 8) | ((data & 0x00ff00ff) << 8);
data = ((data & 0xf0f0f0f0) >> 4) | ((data & 0x0f0f0f0f) << 4);
data = ((data & 0xcccccccc) >> 2) | ((data & 0x33333333) << 2);
data = ((data & 0xaaaaaaaa) >> 1) | ((data & 0x55555555) << 1);
switch (mode)
{
case REF_32BIT:
return data;
case REF_16BIT:
return (data >> 16) & 0xffff;
case REF_8BIT:
return (data >> 24) & 0xff;
case REF_7BIT:
return (data >> 25) & 0x7f;
case REF_6BIT:
return (data >> 26) & 0x7f;
case REF_5BIT:
return (data >> 27) & 0x1f;
case REF_4BIT:
return (data >> 28) & 0x0f;
}
return 0;
}
uint8_t CheckCrc4(uint8_t poly, uint8_t init, bool refIn, bool refOut, uint8_t xorOut,
const uint8_t *buffer, uint32_t length)
{
uint8_t i;
uint8_t crc;
if (refIn == true)
{
crc = init;
poly = ReflectedData(poly, REF_4BIT);
while (length--)
{
crc ^= *buffer++;
for (i = 0; i < 8; i++)
{
if (crc & 0x01)
{
crc >>= 1;
crc ^= poly;
}
else
{
crc >>= 1;
}
}
}
return crc ^ xorOut;
}
else
{
crc = init << 4;
poly <<= 4;
while (length--)
{
crc ^= *buffer++;
for (i = 0; i < 8; i++)
{
if (crc & 0x80)
{
crc <<= 1;
crc ^= poly;
}
else
{
crc <<= 1;
}
}
}
return (crc >> 4) ^ xorOut;
}
}
uint8_t CheckCrc5(uint8_t poly, uint8_t init, bool refIn, bool refOut, uint8_t xorOut,
const uint8_t *buffer, uint32_t length)
{
uint8_t i;
uint8_t crc;
if (refIn == true)
{
crc = init;
poly = ReflectedData(poly, REF_5BIT);
while (length--)
{
crc ^= *buffer++;
for (i = 0; i < 8; i++)
{
if (crc & 0x01)
{
crc >>= 1;
crc ^= poly;
}
else
{
crc >>= 1;
}
}
}
return crc ^ xorOut;
}
else
{
crc = init << 3;
poly <<= 3;
while (length--)
{
crc ^= *buffer++;
for (i = 0; i < 8; i++)
{
if (crc & 0x80)
{
crc <<= 1;
crc ^= poly;
}
else
{
crc <<= 1;
}
}
}
return (crc >> 3) ^ xorOut;
}
}
uint8_t CheckCrc6(uint8_t poly, uint8_t init, bool refIn, bool refOut, uint8_t xorOut,
const uint8_t *buffer, uint32_t length)
{
uint8_t i;
uint8_t crc;
if (refIn == true)
{
crc = init;
poly = ReflectedData(poly, REF_6BIT);
while (length--)
{
crc ^= *buffer++;
for (i = 0; i < 8; i++)
{
if (crc & 0x01)
{
crc >>= 1;
crc ^= poly;
}
else
{
crc >>= 1;
}
}
}
return crc ^ xorOut;
}
else
{
crc = init << 2;
poly <<= 2;
while (length--)
{
crc ^= *buffer++;
for (i = 0; i < 8; i++)
{
if (crc & 0x80)
{
crc <<= 1;
crc ^= poly;
}
else
{
crc <<= 1;
}
}
}
return (crc >> 2) ^ xorOut;
}
}
uint8_t CheckCrc7(uint8_t poly, uint8_t init, bool refIn, bool refOut, uint8_t xorOut,
const uint8_t *buffer, uint32_t length)
{
uint8_t i;
uint8_t crc;
if (refIn == true)
{
crc = init;
poly = ReflectedData(poly, REF_7BIT);
while (length--)
{
crc ^= *buffer++;
for (i = 0; i < 8; i++)
{
if (crc & 0x01)
{
crc >>= 1;
crc ^= poly;
}
else
{
crc >>= 1;
}
}
}
return crc ^ xorOut;
}
else
{
crc = init << 1;
poly <<= 1;
while (length--)
{
crc ^= *buffer++;
for (i = 0; i < 8; i++)
{
if (crc & 0x80)
{
crc <<= 1;
crc ^= poly;
}
else
{
crc <<= 1;
}
}
}
return (crc >> 1) ^ xorOut;
}
}
uint8_t CheckCrc8(uint8_t poly, uint8_t init, bool refIn, bool refOut, uint8_t xorOut,
const uint8_t *buffer, uint32_t length)
{
uint32_t i = 0;
uint8_t crc = init;
while (length--)
{
if (refIn == true)
{
crc ^= ReflectedData(*buffer++, REF_8BIT);
}
else
{
crc ^= *buffer++;
}
for (i = 0; i < 8; i++)
{
if (crc & 0x80)
{
crc <<= 1;
crc ^= poly;
}
else
{
crc <<= 1;
}
}
}
if (refOut == true)
{
crc = ReflectedData(crc, REF_8BIT);
}
return crc ^ xorOut;
}
uint16_t CheckCrc16(uint16_t poly, uint16_t init, bool refIn, bool refOut, uint16_t xorOut,
const uint8_t *buffer, uint32_t length)
{
uint32_t i = 0;
uint16_t crc = init;
while (length--)
{
if (refIn == true)
{
crc ^= ReflectedData(*buffer++, REF_8BIT) << 8;
}
else
{
crc ^= (*buffer++) << 8;
}
for (i = 0; i < 8; i++)
{
if (crc & 0x8000)
{
crc <<= 1;
crc ^= poly;
}
else
{
crc <<= 1;
}
}
}
if (refOut == true)
{
crc = ReflectedData(crc, REF_16BIT);
}
return crc ^ xorOut;
}
uint32_t CheckCrc32(uint32_t poly, uint32_t init, bool refIn, bool refOut, uint32_t xorOut,
const uint8_t *buffer, uint32_t length)
{
uint32_t i = 0;
uint32_t crc = init;
while (length--)
{
if (refIn == true)
{
crc ^= ReflectedData(*buffer++, REF_8BIT) << 24;
}
else
{
crc ^= (*buffer++) << 24;
}
for (i = 0; i < 8; i++)
{
if (crc & 0x80000000)
{
crc <<= 1;
crc ^= poly;
}
else
{
crc <<= 1;
}
}
}
if (refOut == true)
{
crc = ReflectedData(crc, REF_32BIT);
}
return crc ^ xorOut;
}
uint32_t CrcCheck(CRC_Type crcType, const uint8_t *buffer, uint32_t length)
{
switch (crcType.width)
{
case 4:
return CheckCrc4(crcType.poly, crcType.init, crcType.refIn, crcType.refOut,
crcType.xorOut, buffer, length);
case 5:
return CheckCrc5(crcType.poly, crcType.init, crcType.refIn, crcType.refOut,
crcType.xorOut, buffer, length);
case 6:
return CheckCrc6(crcType.poly, crcType.init, crcType.refIn, crcType.refOut,
crcType.xorOut, buffer, length);
case 7:
return CheckCrc7(crcType.poly, crcType.init, crcType.refIn, crcType.refOut,
crcType.xorOut, buffer, length);
case 8:
return CheckCrc8(crcType.poly, crcType.init, crcType.refIn, crcType.refOut,
crcType.xorOut, buffer, length);
case 16:
return CheckCrc16(crcType.poly, crcType.init, crcType.refIn, crcType.refOut,
crcType.xorOut, buffer, length);
case 32:
return CheckCrc32(crcType.poly, crcType.init, crcType.refIn, crcType.refOut,
crcType.xorOut, buffer, length);
}
return 0;
}
Comments