AN3375 datasheet(13/73 Pages) STMICROELECTRONICS

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AN3375

CR95HF low level layer

Doc ID 018637 Rev 1

13/73

2.3.3

ProtocolSelect function

This function sends a Protocol Select command to the CR95HF. It selects the RF

communication protocol, configures RF parameters, and switches the RF field on.

To set up communications with a contactless tag, the Protocol Select command shall be

sent to the CR95HF before the SendRecv command.

The Data parameter signification depends on the selected protocol (Protocol parameter).

Table 6 shows the parameter values for the ISO 15693 protocol.

Table 5.

CR95HF_ProtocolSelect function description

Function description

Prototype

result = int8_t CR95HF_ProtocolSelect(uc8

Length,uc8 Protocol,uc8 *Data,uint8_t *pResponse

Input parameter

Length: Number of data bytes

Protocol: type of protocol

Data: pointer to data

Output parameter

pResponse: pointer to CR95HF response

Return parameter

CR95HF_ERRORCODE_PARAMETER: function failed

CR95HF_SUCCESS_CODE: function successful

CR95HF_ERRORCODE_PARAMETERLENGTH: parameter length is

erroneous

Table 6.

CR95HF_ProtocolSelect ISO15693 protocol parameter

Parameter name

Byte

Bit

Value

Example

Command Code

7:0

0x02: Select command code

0x02020126

Length

7:0

0x02: number of bytes

Protocol

7:0

0x01: ISO15693 protocol

Parameter

7:6

RFU

5:4

00b: 26 kbps

01b: 52 kbps

10b: 6 kbps

11b: RFU

0b: respect 312µs delay

1b: wait for SOF

0b: 100 % modulation

1b: 10 % modulation

0b: single subcarrier

1b: dual subcarrier

0b: Do not append CRC

1b: append CRC

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