Emilie Laverge / CRC16 Featured

Implementation of CRC16 using polynomial 0x8005 - (X^16+X^15+X^2+1)

Dependents:   HC05 S5info_APP4

cyclic redundancy check

A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data. Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents; on retrieval the calculation is repeated, and corrective action can be taken against presumed data corruption if the check values do not match.

[source:http://en.wikipedia.org/wiki/Cyclic_redundancy_check]

This class implements a basic CRC16 (17Bits) using polynomial 0x8005 (X^16 + X^15 + X^2 +1).

How to use this library

basic use of CRC 16t

    char testdata[]= "123456789";    
    CRC16 *myCRC = new CRC16();
    unsigned short resultCRC = myCRC->calculateCRC16(testdata,9); //9 is the length of the character array //
    pc.printf("%x",resultCRC);

CRC16.h@0:585ead300cab, 2014-02-12 (annotated)

Committer:
EmLa
Date:
Wed Feb 12 21:34:53 2014 +0000
Revision:
0:585ead300cab
CRC16 implementation; 123456789 --> 0xFEE8

Who changed what in which revision?

UserRevisionLine numberNew contents of line
EmLa 0:585ead300cab 1 #ifndef CRC16_H
EmLa 0:585ead300cab 2 #define CRC16_H
EmLa 0:585ead300cab 3
EmLa 0:585ead300cab 4 class CRC16
EmLa 0:585ead300cab 5 {
EmLa 0:585ead300cab 6 private:
EmLa 0:585ead300cab 7 const unsigned int SHIFTER = 0x00FF;
EmLa 0:585ead300cab 8 unsigned short crc16table[256];
EmLa 0:585ead300cab 9
EmLa 0:585ead300cab 10 public:
EmLa 0:585ead300cab 11 unsigned short calculateCRC16(char input[], int lenght);
EmLa 0:585ead300cab 12 CRC16();
EmLa 0:585ead300cab 13 ~CRC16();
EmLa 0:585ead300cab 14 };
EmLa 0:585ead300cab 15 #endif