AN3985 datasheet(49/105 Pages) STMICROELECTRONICS

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AN3985

ISO/IEC 15693 layer

Doc ID 022255 Rev 2

49/105

ISO15693_Is_Collision_Flag_Set function

This function checks if the check collision flag added by the CR95HF is set or not. If it is, it

means that the CRC95HF has detected a collision between two contactless tag answers.

ISO15693_IsCRC_Flag_Set function

This function checks if the check CRC flag added by the CR95HF is set or not. If it is, it

means that the CRC95HF has detected an error during the reception.

ISO15693_Is_CorrectCRC16_Check function

This function checks the check CRC flag and the residue of the received command. If there

is any problem (mismatch or error), the function returns an error value.

Table 74.

ISO15693_Is_Collision_Flag_Set function description

Prototype

ISO15693_Is_Collision_Flag_Set(CR95HF_ResponseReceiv

ing* Response);

Input parameter

ISO15693_Response_flags: response flag provided by the tag

ISO15693_cmd_code: command code emitted to contactless tag

Output parameter

None

Return parameter

TRUE_CODE: The collision flag is set.

FALSE_CODE: The collision flag is not set.

Table 75.

ISO15693_IsCRC_Flag_Set function description

Prototype

u8 ISO15693_IsCRC_Flag_Set(CR95HF_ResponseReceiving

Response);

Input parameter

Response: response returned by CR95HF containing the data

Output parameter

None

Return parameter

TRUE_CODE: The CRT flag is set.

FALSE_CODE: The CRT flag is not set.

Table 76.

ISO15693_Is_CorrectCRC16_Check function description

Prototype

ISO15693_Is_CorrectCRC16_Check(CR95HF_ResponseReceiv

ing* Response);

Input parameter

Response: response returned by CR95HF containing the data.

Output parameter

None

Return parameter

TRUE_CODE: The CRC residue is correct.

FALSE_CODE: There is mismatch or error in CRC residue.

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