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crc7.c
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crc7.c
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/***************************************************************************
* Copyright(C)2014-2015 by FlyLu <[email protected]> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as *
* published by the Free Software Foundation; either version 2 of the *
* License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
/*============================ INCLUDES ======================================*/
#include ".\app_cfg.h"
/*============================ MACROS ========================================*/
#define CRC7_POLY (0x89)
/*============================ MACROFIED FUNCTIONS ===========================*/
/*============================ TYPES =========================================*/
/*============================ PROTOTYPES ====================================*/
/*============================ GLOBAL VARIABLES ==============================*/
/*============================ LOCAL VARIABLES ===============================*/
#if CRC7_OPTIMIZE == CRC_OPT_SPEED
static const uint8_t c_chCRC7Table[256] = {
0x00, 0x09, 0x12, 0x1B, 0x24, 0x2D, 0x36, 0x3F, 0x48, 0x41, 0x5A, 0x53,
0x6C, 0x65, 0x7E, 0x77, 0x19, 0x10, 0x0B, 0x02, 0x3D, 0x34, 0x2F, 0x26,
0x51, 0x58, 0x43, 0x4A, 0x75, 0x7C, 0x67, 0x6E, 0x32, 0x3B, 0x20, 0x29,
0x16, 0x1F, 0x04, 0x0D, 0x7A, 0x73, 0x68, 0x61, 0x5E, 0x57, 0x4C, 0x45,
0x2B, 0x22, 0x39, 0x30, 0x0F, 0x06, 0x1D, 0x14, 0x63, 0x6A, 0x71, 0x78,
0x47, 0x4E, 0x55, 0x5C, 0x64, 0x6D, 0x76, 0x7F, 0x40, 0x49, 0x52, 0x5B,
0x2C, 0x25, 0x3E, 0x37, 0x08, 0x01, 0x1A, 0x13, 0x7D, 0x74, 0x6F, 0x66,
0x59, 0x50, 0x4B, 0x42, 0x35, 0x3C, 0x27, 0x2E, 0x11, 0x18, 0x03, 0x0A,
0x56, 0x5F, 0x44, 0x4D, 0x72, 0x7B, 0x60, 0x69, 0x1E, 0x17, 0x0C, 0x05,
0x3A, 0x33, 0x28, 0x21, 0x4F, 0x46, 0x5D, 0x54, 0x6B, 0x62, 0x79, 0x70,
0x07, 0x0E, 0x15, 0x1C, 0x23, 0x2A, 0x31, 0x38, 0x41, 0x48, 0x53, 0x5A,
0x65, 0x6C, 0x77, 0x7E, 0x09, 0x00, 0x1B, 0x12, 0x2D, 0x24, 0x3F, 0x36,
0x58, 0x51, 0x4A, 0x43, 0x7C, 0x75, 0x6E, 0x67, 0x10, 0x19, 0x02, 0x0B,
0x34, 0x3D, 0x26, 0x2F, 0x73, 0x7A, 0x61, 0x68, 0x57, 0x5E, 0x45, 0x4C,
0x3B, 0x32, 0x29, 0x20, 0x1F, 0x16, 0x0D, 0x04, 0x6A, 0x63, 0x78, 0x71,
0x4E, 0x47, 0x5C, 0x55, 0x22, 0x2B, 0x30, 0x39, 0x06, 0x0F, 0x14, 0x1D,
0x25, 0x2C, 0x37, 0x3E, 0x01, 0x08, 0x13, 0x1A, 0x6D, 0x64, 0x7F, 0x76,
0x49, 0x40, 0x5B, 0x52, 0x3C, 0x35, 0x2E, 0x27, 0x18, 0x11, 0x0A, 0x03,
0x74, 0x7D, 0x66, 0x6F, 0x50, 0x59, 0x42, 0x4B, 0x17, 0x1E, 0x05, 0x0C,
0x33, 0x3A, 0x21, 0x28, 0x5F, 0x56, 0x4D, 0x44, 0x7B, 0x72, 0x69, 0x60,
0x0E, 0x07, 0x1C, 0x15, 0x2A, 0x23, 0x38, 0x31, 0x46, 0x4F, 0x54, 0x5D,
0x62, 0x6B, 0x70, 0x79,
};
#endif
#if CRC7_OPTIMIZE == CRC_OPT_BALANCE
#error CRC7 NOT HAVE CRC_OPT_BALANCE, ONLY HAVE CRC_OPT_SPEED AND CRC_OPT_SIZE
#endif
/*============================ IMPLEMENTATION ================================*/
#if CRC7_OPTIMIZE == CRC_OPT_SIZE
/*! \brief CRC7 MMC SD
*! Poly: 0x09
*! Init: 0x00
*! RefIn: False
*! RefOut: False
*! XorOut: 0x00
*! \param pchCRCValue CRC Variable
*! \param pchData target data stream address
*! \param wLength the number of target data stream
*! \return CRC7 result
*/
uint8_t crc7_stream_check(uint8_t *pchCRCValue, uint8_t *pchData, uint32_t wLength)
{
uint32_t i,j;
uint8_t chCRC7 = 0;
if ((NULL == pchCRCValue) || (NULL == pchData)) {
return false;
}
for (i = 0; i < wLength; i++) {
chCRC7 = (*pchData++) ^ (*pchCRCValue << 1);
for (j = 0; j < 7; j++) {
if (chCRC7 & 0x80) {
chCRC7 ^= CRC7_POLY;
}
chCRC7 <<= 1;
}
if (chCRC7 & 0x80) {
chCRC7 ^= CRC7_POLY;
}
*pchCRCValue = chCRC7;
}
return *pchCRCValue;
}
/*! \brief CRC7 MMC SD
*! Poly: 0x09
*! Init: 0x00
*! RefIn: False
*! RefOut: False
*! XorOut: 0x00
*! \param pchCRCValue CRC Variable
*! \param pchData target data byte
*! \return CRC7 result
*/
uint8_t crc7_check(uint8_t *pchCRCValue, uint8_t chData)
{
uint32_t i;
uint8_t chCRC7 = 0;
if (NULL == pchCRCValue) {
return false;
}
chCRC7 = chData ^ (*pchCRCValue << 1);
for (i = 0; i < 7; i++) {
if (chCRC7 & 0x80) {
chCRC7 ^= CRC7_POLY;
}
chCRC7 <<= 1;
}
if (chCRC7 & 0x80) {
chCRC7 ^= CRC7_POLY;
}
return ((*pchCRCValue) = chCRC7);
}
#endif
#if CRC7_OPTIMIZE == CRC_OPT_SPEED
/*! \brief CRC7 MMC SD
*! Poly: 0x09
*! Init: 0x00
*! RefIn: False
*! RefOut: False
*! XorOut: 0x00
*! \param pchCRCValue CRC Variable
*! \param pchData target data stream address
*! \param wLength the number of target data stream
*! \return CRC7 result
*/
uint8_t crc7_stream_check(uint8_t *pchCRCValue, uint8_t *pchData, uint32_t wLength)
{
uint32_t i;
uint8_t chCRC7;
if ((NULL == pchCRCValue) || (NULL == pchData)) {
return false;
}
chCRC7 = *pchCRCValue;
for (i = 0; i < wLength; i++) {
chCRC7 = c_chCRC7Table[(chCRC7 << 1) ^ *pchData++];
}
return (*pchCRCValue = chCRC7);
}
/*! \brief CRC7 MMC SD
*! Poly: 0x09
*! Init: 0x00
*! RefIn: False
*! RefOut: False
*! XorOut: 0x00
*! \param pchCRCValue CRC Variable
*! \param pchData target data
*! \return CRC7 result
*/
uint8_t crc7_check(uint8_t *pchCRCValue, uint8_t chData)
{
uint8_t chCRC7;
if (NULL == pchCRCValue) {
return false;
}
chCRC7 = *pchCRCValue << 1;
chCRC7 = c_chCRC7Table[chCRC7 ^ chData];
return (*pchCRCValue = chCRC7);
}
#endif