AN3985 datasheet(57/105 Pages) STMICROELECTRONICS

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AN3985

ISO/IEC 15693 layer

Doc ID 022255 Rev 2

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ISO15693_Get_UID_from_EEPROM function

This function retrieves the UID stored into the EEPROM by the inventory 16 slots

commands.

5.4.6

CRC16 functions

ISO15693_CRC16 function

This function computes the CRC16 as defined by CRC ISO/IEC 13239

ISO15693_IsCorrectCRC16Residue function

This function computes the CRC16 residue as defined by CRC ISO/IEC 13239 and returns

ISO15693_RESULTOKCRC16 if the residue is compliant the ISO specification.

Table 98.

ISO15693_Get_UID_from_EEPROM function description

Prototype

u8 ISO15693_Get_UID_from_EEPROM(u8* UID_Tag, u8

UID_number);

Input parameter

MemSize: pointer on the bytes describing the memory size

Output parameter

None

Return parameter

ISO15693_ERROR_CODE: The UID read from EEPROM contains an error.

ISO15693_SUCCESS_CODE

Table 99.

ISO15693_CRC16 function description

Prototype

int16_t ISO15693_CRC16 (u8* DataIn,u8 NbByte);

Input parameter

DataIn: input data

Length: number of bytes of DataIn

Output parameter

None

Return parameter

ResCrc: CRC16 computed.

Table 100.

ISO15693_IsCorrectCRC16Residue function description

Prototype

ISO15693_IsCorrectCRC16Residue (u8 *DataIn,u8 Length);

Input parameter

DataIn: input data

Length: number of bytes of DataIn

Output parameter

None

Return parameter

ISO15693_RESULTOKCRC16: CRC16 residue is correct.

ISO15693_ERRORCODE_GENERICCRC16: CRC16 residue is false.

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