crc.h

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#ifndef _CRC16_
#define _CRC16_


/*
  @brief CRC-CITT calculation using the tabular form.
  @param [in] message - the pointer to the message array.
  @param [in] length - the length of the message.
  @return the 16-bit CRC value.*/
unsigned short  ccitt_crc16 (unsigned char * message,short length);
/*
 * @brief Test the input message against its attached CRC16 code.
 * @note Here we assume that the CRC is attached as the last two bytes of the message.
 * @param [in] message - pointer to the message character array
 * @param [in] length - the length of the message array
 * @return the result of the test.
 * <table><th><td>Value</td><td>Meaning</td></th>
 *    <tr><td>0</td><td>The CRC test is failed</td></tr>
 *    <tr><td>1</td><td>The CRC test is passed</td></tr>
 * </table>*/
char ccitt_crc16_test(unsigned char *message,short length);
#endif