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AN3955

ISO/IEC 14443-3 layers

Doc ID 022017 Rev 1

37/68

The ISO14443A_GetFirstCollisionBit function returns the index of the first bit where

the collision is detected. This information is extracted from control byte of CR95HF. Table 53

describes the ISO14443A_GetFirstCollisionBit function.

Table 53.

ISO14443A_GetFirstCollisionBit function description

5.1.11

ISO/IEC 14443-3 Type A Advanced functions

The ISO14443A_SelectSequence function runs a select sequence. For more

information, refer to the ISO/IEC 14443-3 documentation. Table 54 describes the

ISO14443A_SelectSequence

function.

Table 54.

ISO14443A_SelectSequence function description

For more information about the ISO14443A_SelectSequence function, refer to Table 32:

ISO/IEC 14443-3 Type A Advanced function description.

Prototype

int8_t ISO14443A_GetFirstCollisionBit (uc8*CR95HF

ControlByteIndex);

Input parameter

CR95HFControlByteIndex: Pointer of the CR95HF control bytes (3

bytes)(1).

Three control bytes are appended by CR95HF to contactless tag response. Refer to Table 12: CR95HF

success response value for ISO/IEC 14443-3 Type A.

Output parameter

None

Return parameter

Index of the first bit where the collision is detected.

Prototype

int8_t ISO14443A_SelectSequence(uint_t*SAKByte);

Input parameter

None

Output parameter

SAKByte: The last SAK byte received from a contactless tag during select

sequence.

Return parameter

RESULTOK: Function is successful. The Select sequence is completed.

ERRORCODE_GENERIC: Function failed. An error occured during a select

sequence.

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