AN3955 datasheet(50/68 Pages) STMICROELECTRONICS

50 / 68 page

SRIX4K library

AN3955

50/68

Doc ID 022017 Rev 1

6.1.3

CR95HF configuration function

The SRIX4K_ProtocolSelect function sends a ProtocolSelect command to the CR95HF

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

rates are integrated in the command. Table 78 describes the SRIX4K_ProtocolSelect

function.

Note:

The Bit 0 (Append CRC) is automatically set inside this function enabling the CR95HF to

manage the CRC of the RF command.

For more information, refer to Section 5.2.4: ISO/IEC 14443-3 Type B CRC16 management.

6.1.4

SRIX4K command function

These functions send a RF command defined in SRIX4 datasheet to a contactless tag and

check the CR95HF response.

The SRIX4K_Initiate function sends an Initiate command to a contactless tag. Table 79

describes the SRIX4K_Initiate function.

Table 78.

SRIX4K_ProtocolSelect function description

Prototype

int8_t SRIX4K_ProtocolSelect(uc8TxDataRate

,uint8_tRxDataRate,uint8_t*pResponse);

Input parameter

TxDataRate: Transmission data rate (2bits)

RxDataRate: Reception data rate (2bits)

Output parameter

pResponse: Pointer to the CR95HF response

Return parameter

RESULTOK: The ISO/IEC 14443_4 Type B protocol is selected.

SRIX4K_ERRORCODE_PARAMETER: One parameter is

incorrect.

CR95HF_ERROR_CODE: Function failed. The ISO/IEC

14443_4 Type B protocol is not selected.

Table 79.

SRIX4K_Initiate function description

Prototype

int8_t SRIX4K_Initiate(uint8_t*pResponse);

Input parameter

None

Output parameter

pResponse: Pointer to the CR95HF response

Return parameter

RESULTOK: Function is successful. The command is

successfully emitted to a contactless tag.

CR95HF_ERROR_CODE: Function failed. The CR95HF

returns an error code.

AN3955 Datasheet(PDF) 50 Page - STMicroelectronics

AN3955 Datasheet(HTML) 50 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68

Datasheet Download

Link URL