AN3955 datasheet(30/68 Pages) STMICROELECTRONICS

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ISO/IEC 14443-3 layers

AN3955

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Doc ID 022017 Rev 1

5.1.6

CR95HF configuration function

The CR95HF configuration function sends a ProtocolSelect command to CR95HF device in

order to select the ISO/IEC 14443-3 Type A protocol. The transmission and reception data

rates are integrated in the command. This command turns on the RF field.

Table 33 describes the ISO14443A_ProtocolSelect function.

Table 33.

ISO14443A_ProtocolSelect function description

5.1.7

ISO/IEC 14443-3 Type A command function

These functions send a basic RF command to a contactless tag and check the CR95HF

response.

The ISO14443A_REQA function sends a REQA command to a contactless tag. Table 34

describes the ISO14443A_REQA function.

Table 34.

ISO14443A_REQA function description

The ISO14443A_WUPA function sends a WUPA command to a contactless tag. Table 35

describes the ISO14443A_WUPA function.

Table 35.

ISO14443A_WUPA function description

Prototype

int8_t ISO14443A_ProtocolSelect (uc8TXDataRate, uc8

RxDataRate, uint8_t*pResponse);

Input parameter

TxDataRate: Transmission data rate (2 bits)

RxDataRate: Reception data rate (2 bits)

Output parameter

pResponse: Pointer to the CR95HF response

Return parameter

RESULTOK: The ISO/IEC 14443-3 Type A protocol is selected.

ISO14443A_ERRORCODE_PARAMETER: One parameter is incorrect.

CR95HF_ERROR_CODE: Function failed. The ISO/IEC 14443-3 Type A

protocol is not selected.

Prototype

ISO14443A_REQA (uint8_t *pResponse);

Input parameter

None

Output parameter

pResponse: Pointer to the CR95HF response

Return parameter

RESULTOK: The REQA command is successfully emitted to a contactless

tag.

CR95HF_ERROR_CODE: Function failed. The CR95HF returns an error

code.

Prototype

int8_t ISO14443A_WUPA (uint8_t *pResponse);

Input parameter

None

Output parameter

pResponse: Pointer to the CR95HF response

Return parameter

RESULTOK: The WUPA command is successfully emitted to a contactless

tag.

CR95HF_ERROR_CODE: Function failed. The CR95HF returns an error

code.

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