AN3375 datasheet(25/73 Pages) STMICROELECTRONICS

No. de pieza	AN3375

Descripción Electrónicos	CR95HF library for ISO15693 and Dual Interface EEPROM products

PDF	73 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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25 / 73 page

AN3375

ISO15693 library (intermediate layer)

Doc ID 018637 Rev 1

25/73

3.3

CRC management functions

These functions compute either CRC or CRC residue according to the ISO15693

specifications.

3.3.1

ISO15693_CRC16 function

This function returns a 2-byte CRC value as defined in ISO15693 specifications.

3.3.2

ISO15693_IsCorrectCRC16Residue function

This function returns RESULTOK if the 2-byte CRC is correct.

The CR95HF library provides all the commands defined in the ISO/IEC FCD 15693-3

standard. Only the main command is described in the present section.

Table 22.

ISO15693_CRC16 function description

Function description

Prototype

result = int16_t ISO15693_CRC16 (uc8

*DataIn, uc8 Length);

Input parameter

DataIn: pointer on input data

Length: Number of byte of data

Output parameter

none

Return parameter

computed 2 byte CRC

Table 23.

ISO15693_IsCorrectCRC16Residue function description

Function description

Prototype

result = int8_t

ISO15693_IsCorrectCRC16Residue (uc8

*DataIn,uc8 Length);

Input parameter

DataIn: input data

Length: Number of byte of data

Output parameter

none

Return parameter

RESULTOK: CRC Residue is conform to ISO15693

ERRORCODE_GENERIC: CRC Residue is not conform to

ISO15693

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