CRC16.c 4.1 KB

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  1. /*
  2. * CRC16.c
  3. *
  4. * Created on: 2019. 7. 3.
  5. * Author: parkyj
  6. */
  7. /*---------------------------------------------------------------------------------------*/
  8. /* CRC16 TABLE */
  9. /*---------------------------------------------------------------------------------------*/
  10. #include "CRC16.h"
  11. const unsigned short Table_CRC16[] = {
  12. 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
  13. 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
  14. 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
  15. 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
  16. 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
  17. 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
  18. 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
  19. 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
  20. 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
  21. 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
  22. 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
  23. 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
  24. 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
  25. 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
  26. 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
  27. 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
  28. 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
  29. 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
  30. 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
  31. 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
  32. 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
  33. 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
  34. 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
  35. 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
  36. 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
  37. 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
  38. 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
  39. 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
  40. 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
  41. 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
  42. 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
  43. 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
  44. };
  45. //-----------------------------------------------
  46. //UART CRC üũ ÇÔ¼ö
  47. //-----------------------------------------------
  48. unsigned short genCRC16(char *buf_ptr, int len)
  49. {
  50. unsigned char dt = 0U;
  51. unsigned short crc16 = 0U;
  52. len *= 8;
  53. for(crc16 = (unsigned short)0x0000; len >= 8; len -= 8, buf_ptr++)
  54. {
  55. crc16 = (unsigned short)(Table_CRC16[(crc16>>8) ^ (unsigned short)(*buf_ptr)] ^ (crc16<<8));
  56. }
  57. if(len != 0)
  58. {
  59. dt = (unsigned char)(*buf_ptr << 8);
  60. while(len != 0)
  61. {
  62. len--;
  63. if(((crc16^dt) & ((unsigned short)1 << 15)) != 0)
  64. {
  65. crc16 = (unsigned short)(crc16 << 1);
  66. crc16 = (unsigned short)(crc16 ^ 0x1021);
  67. }
  68. else
  69. {
  70. crc16 = (unsigned short)(crc16 << 1);
  71. }
  72. dt = (unsigned char)(dt << 1);
  73. }
  74. }
  75. return(crc16);
  76. }
  77. uint8_t STH30_CreateCrc(uint8_t *data, uint8_t nbrOfBytes)
  78. {
  79. uint8_t bit; // bit mask
  80. uint8_t crc = 0xFF; // calculated checksum
  81. uint8_t byteCtr; // byte counter
  82. // calculates 8-Bit checksum with given polynomial
  83. for(byteCtr = 0; byteCtr < nbrOfBytes; byteCtr++)
  84. {
  85. crc ^= (data[byteCtr]);
  86. for(bit = 8; bit > 0; --bit)
  87. {
  88. if(crc & 0x80) crc = (crc << 1) ^ POLYNOMIAL;
  89. else crc = (crc << 1);
  90. }
  91. }
  92. return crc;
  93. }
  94. etError STH30_CheckCrc(uint8_t *data, uint8_t nbrOfBytes, uint8_t checksum)
  95. {
  96. uint8_t bit; // bit mask
  97. uint8_t crc = 0xFF; // calculated checksum
  98. uint8_t byteCtr; // byte counter
  99. // calculates 8-Bit checksum with given polynomial
  100. for(byteCtr = 0; byteCtr < nbrOfBytes; byteCtr++)
  101. {
  102. crc ^= (data[byteCtr]);
  103. for(bit = 8; bit > 0; --bit)
  104. {
  105. if(crc & 0x80) crc = (crc << 1) ^ POLYNOMIAL;
  106. else crc = (crc << 1);
  107. }
  108. }
  109. if(crc != checksum) return CHECKSUM_ERROR;
  110. else return NO_ERROR;
  111. }