Pavit Noinongyao / Mbed 2 deprecated SmartPlugBLEdebug

Bluetooth Low Energy for Smart Plug

Dependencies:   BLE_API mbed nRF51822

Fork of SmartPlugBLE by Pavit Noinongyao

crc8.c@4:721ae30c92f8, 2015-07-14 (annotated)

Committer:
Slepnir
Date:
Tue Jul 14 10:10:19 2015 +0000
Revision:
4:721ae30c92f8
Parent:
3:aaa92c61931a 
For debugging

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Slepnir 3:aaa92c61931a 1 //================ File Despciption =========================================//
Slepnir 3:aaa92c61931a 2 //=== File name : crc8.c
Slepnir 3:aaa92c61931a 3 //===
Slepnir 3:aaa92c61931a 4 //#include "crc8.h"
Slepnir 3:aaa92c61931a 5 //===========================================================================//
Slepnir 3:aaa92c61931a 6
Slepnir 3:aaa92c61931a 7 //================ Index ====================================================//
Slepnir 3:aaa92c61931a 8 //
Slepnir 3:aaa92c61931a 9 //================ Include Header ===========================================//
Slepnir 3:aaa92c61931a 10 //
Slepnir 3:aaa92c61931a 11 //================ PUBLIC METHOD ============================================//
Slepnir 3:aaa92c61931a 12 // extern function from another file
Slepnir 3:aaa92c61931a 13 //
Slepnir 3:aaa92c61931a 14 //================ PRIVATE METHOD ===========================================//
Slepnir 3:aaa92c61931a 15 // non extern function
Slepnir 3:aaa92c61931a 16 //
Slepnir 3:aaa92c61931a 17 //================ PUBLIC DATA ==============================================//
Slepnir 3:aaa92c61931a 18 // extern data
Slepnir 3:aaa92c61931a 19 //
Slepnir 3:aaa92c61931a 20 //================ PRIVATE DATA =============================================//
Slepnir 3:aaa92c61931a 21 // non extern data
Slepnir 3:aaa92c61931a 22 //
Slepnir 3:aaa92c61931a 23 //================ PRIVATE DEFINE ===========================================//
Slepnir 3:aaa92c61931a 24 //
Slepnir 3:aaa92c61931a 25 //================ PRIVATE MACRO ============================================//
Slepnir 3:aaa92c61931a 26 //
Slepnir 3:aaa92c61931a 27 //================ SOURCE CODE ==============================================//
Slepnir 3:aaa92c61931a 28 //
Slepnir 3:aaa92c61931a 29 //This procedure calculates the cumulative Dallas Semiconductor
Slepnir 3:aaa92c61931a 30 // 1-Wire CRC of all bytes passed to it. The result
Slepnir 3:aaa92c61931a 31 //accumulates in the global variable CRC.
Slepnir 3:aaa92c61931a 32 const unsigned char crc8_table[256]={
Slepnir 3:aaa92c61931a 33 0x00,0x07,0x0E,0x09,0x1C,0x1B,0x12,0x15,0x38,0x3F,0x36,0x31,0x24,0x23,0x2A,0x2D,
Slepnir 3:aaa92c61931a 34 0x70,0x77,0x7E,0x79,0x6C,0x6B,0x62,0x65,0x48,0x4F,0x46,0x41,0x54,0x53,0x5A,0x5D,
Slepnir 3:aaa92c61931a 35 0xE0,0xE7,0xEE,0xE9,0xFC,0xFB,0xF2,0xF5,0xD8,0xDF,0xD6,0xD1,0xC4,0xC3,0xCA,0xCB,
Slepnir 3:aaa92c61931a 36 0x90,0x97,0x9E,0x99,0x8C,0x8B,0x82,0x85,0xA8,0xAF,0xA6,0xA1,0xB4,0xB3,0xBA,0xBD,
Slepnir 3:aaa92c61931a 37 0xC7,0xC0,0xC9,0xCE,0xDB,0xDC,0xD5,0xD2,0xFF,0xF8,0xF1,0xF6,0xE3,0xE4,0xED,0xEA,
Slepnir 3:aaa92c61931a 38 0xB7,0xB0,0xB9,0xBE,0xAB,0xAC,0xA5,0xA2,0x8F,0x88,0x81,0x86,0x93,0x94,0x9D,0x9A,
Slepnir 3:aaa92c61931a 39 0x27,0x20,0x29,0x2E,0x3B,0x3C,0x35,0x32,0x1F,0x18,0x11,0x16,0x03,0x04,0x0D,0x0A,
Slepnir 3:aaa92c61931a 40 0x57,0x50,0x59,0x5E,0x4B,0x4C,0x45,0x42,0x6F,0x68,0x61,0x66,0x73,0x74,0x7D,0x7A,
Slepnir 3:aaa92c61931a 41 0x89,0x8E,0x87,0x80,0x95,0x92,0x9B,0x9C,0xB1,0xB6,0xBF,0xB8,0xAD,0xAA,0xA3,0xA4,
Slepnir 3:aaa92c61931a 42 0xF9,0xFE,0xF7,0xF0,0xE5,0xE2,0xEB,0xEC,0xC1,0xC6,0xCF,0xC8,0xDD,0xDA,0xD3,0xD4,
Slepnir 3:aaa92c61931a 43 0x69,0x6E,0x67,0x60,0x75,0x72,0x7B,0x7C,0x51,0x56,0x5F,0x58,0x4D,0x4A,0x43,0x44,
Slepnir 3:aaa92c61931a 44 0x19,0x1E,0x17,0x10,0x05,0x02,0x0B,0x0C,0x21,0x26,0x2F,0x28,0x3D,0x3A,0x33,0x34,
Slepnir 3:aaa92c61931a 45 0x4E,0x49,0x40,0x47,0x52,0x55,0x5C,0x5B,0x76,0x71,0x78,0x7F,0x6A,0x6D,0x64,0x63,
Slepnir 3:aaa92c61931a 46 0x3E,0x39,0x30,0x37,0x22,0x25,0x2C,0x2B,0x06,0x01,0x08,0x0F,0x1A,0x1D,0x14,0x13,
Slepnir 3:aaa92c61931a 47 0xAE,0xA9,0xA0,0xA7,0xB2,0xB5,0xBC,0xBB,0x96,0x91,0x98,0x9F,0x8A,0x8D,0x84,0x83,
Slepnir 3:aaa92c61931a 48 0xDE,0xD9,0xD0,0xD7,0xC2,0xC5,0xCC,0xCB,0xE6,0xE1,0xE8,0xEF,0xFA,0xFD,0xF4,0xF3
Slepnir 3:aaa92c61931a 49
Slepnir 3:aaa92c61931a 50 };
Slepnir 3:aaa92c61931a 51
Slepnir 3:aaa92c61931a 52
Slepnir 3:aaa92c61931a 53 inline unsigned char crc8Compute(unsigned char *p,unsigned char length)
Slepnir 3:aaa92c61931a 54 {
Slepnir 3:aaa92c61931a 55 unsigned char crc8;
Slepnir 3:aaa92c61931a 56 unsigned char i;
Slepnir 3:aaa92c61931a 57 unsigned char offset;
Slepnir 3:aaa92c61931a 58
Slepnir 3:aaa92c61931a 59 crc8 = 0;
Slepnir 3:aaa92c61931a 60 for(i = 0; i < length; i++)
Slepnir 3:aaa92c61931a 61 {
Slepnir 3:aaa92c61931a 62 offset = crc8 ^ *(p + i);
Slepnir 3:aaa92c61931a 63 crc8 = crc8_table[offset];
Slepnir 3:aaa92c61931a 64 }
Slepnir 3:aaa92c61931a 65 return crc8;
Slepnir 3:aaa92c61931a 66 //return crc8 ^ 0x55;
Slepnir 3:aaa92c61931a 67 }
Slepnir 3:aaa92c61931a 68 /*
Slepnir 3:aaa92c61931a 69 * Function: Do_CRC8
Slepnir 3:aaa92c61931a 70 * * Description:
Slepnir 3:aaa92c61931a 71 * Computes the CRC value given the byte and the old CRC value as a static value
Slepnir 3:aaa92c61931a 72 *
Slepnir 3:aaa92c61931a 73 * Return Value: CRC value
Slepnir 3:aaa92c61931a 74 * Parameters: Input data byte to be CRC'ed
Slepnir 3:aaa92c61931a 75 * Remarks:
Slepnir 3:aaa92c61931a 76 * uses a table driven method to speed things up.
Slepnir 3:aaa92c61931a 77 *
Slepnir 3:aaa92c61931a 78 * */
Slepnir 3:aaa92c61931a 79 inline unsigned char crc8OneByte(unsigned char xx,unsigned char ucCRC)
Slepnir 3:aaa92c61931a 80 {
Slepnir 3:aaa92c61931a 81 ucCRC = crc8_table[ucCRC ^ xx];
Slepnir 3:aaa92c61931a 82
Slepnir 3:aaa92c61931a 83 return (ucCRC);
Slepnir 3:aaa92c61931a 84 }
Slepnir 3:aaa92c61931a 85
Slepnir 3:aaa92c61931a 86 unsigned char Crc8(unsigned char* xx,const int size, unsigned char ucCRC)
Slepnir 3:aaa92c61931a 87 {
Slepnir 3:aaa92c61931a 88
Slepnir 3:aaa92c61931a 89 int i;
Slepnir 3:aaa92c61931a 90 for(i=0; i<size; i++)
Slepnir 3:aaa92c61931a 91 {
Slepnir 3:aaa92c61931a 92 ucCRC=crc8OneByte(xx[i],ucCRC);
Slepnir 3:aaa92c61931a 93 }
Slepnir 3:aaa92c61931a 94 return ucCRC;
Slepnir 3:aaa92c61931a 95 }
Slepnir 3:aaa92c61931a 96 //================ END OF FILE ==============================================//
Slepnir 3:aaa92c61931a 97 //
Slepnir 3:aaa92c61931a 98
Slepnir 3:aaa92c61931a 99