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AN3955

ISO/IEC 14443-3 layers

Doc ID 022017 Rev 1

33/68

The ISO14443A_SelectLevel3 function sends a Select (level 3) command to a

contactless tag. Table 42 describes the ISO14443A_SelectLevel3 function.

Table 42.

ISO14443A_SelectLevel3 function description

The ISO14443A_SelectSequence function described in Section 5.1.11: ISO/IEC 14443-

3 Type A Advanced functions carries out a whole sequence using the Select and

Anticollision commands.

For more information, refer to Section 5.1.5: Functions of ISO/IEC 14443_A layer.

5.1.8

ISO/IEC 14443-3 Type A Split function

The ISO14443A_SplitATQA function splits the ATQA contactless tag response. Table 43

describes the ISO14443A_SplitATQA function.

Table 43.

ISO14443A_Split ATQA function description

Prototype

int8_t ISO14443A_SelectLevel3 (uc8 NbByteUIDin,

uc8*UIDin, uint8_t*pResponse);

Input parameter

NbByteUIDin: Number of bytes of the UIDin parameter

UIDin: Pointer of a contacless tag UID

Output parameter

pResponse: Pointer to the CR95HF response

Return parameter

RESULTOK: The Select (level 3)command is successfully emitted to

contactless tag.

ISO14443A_ERRORCODE_PARAMETER: NbByteUIDin is incorrect.

CR95HF_ERROR_CODE: Function failed. The CR95HF returns an error

code.

Prototype

int8_t ISO14443A_SplitATQA (uint8_t

*ReaderResponse, uint8_t*ProprietaryCoding,

uint8_t*UIDsizeframe, uint8_t*BitFrameAnticol,

uint8_t*CR95HFControlByteIndex);

Input parameter

ReaderResponse: Pointer of the CR95HF response

Output parameter

ProprietaryCoding: Proprietary coding (4 bits)

UIDsizeframe: UID size bit frame (2 bits): 0 for single UID size, 1 for double

UID size, 2 for triple UID size

BitFrameAnticol: Bit frame anti-collision (5 bits)

CR95HFControlByteIndex: Index on control byte of CR95HF response (3

bytes)

Return parameter

RESULTOK: Function is successful.

CR95HF_ERROR_CODE: Function failed. The CR95HF returns an error

code.

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