AN3955 datasheet(16/68 Pages) STMICROELECTRONICS

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CR95HF low level layer

AN3955

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Doc ID 022017 Rev 1

4.4

IDN function

The CR95HF_IDN function sends an IDN command to the CR95HF device.

4.5

ECHO function

The CR95HF_Echo function sends an ECHO command to the CR95HF device.

4.6

ProtocolSelect function

The CR95HF_ProtocolSelect function sends a ProtocolSelect command to the CR95HF

device.

To set up communications with a contactless tag, the ProtocolSelect command must be sent

to the CR95HF before the SendRecv commands.

The Data input parameter depends on the selected protocol. This application note applies to

ISO/IEC 14443-3 Type A and ISO/IEC 14443-3 Type B products.

Table 4.

CR95HF_IDN function description

Prototype

result = int8_t CR95HF_IDN (uint8_t *pResponse)

Input parameter

None

Output parameter

pResponse: Pointer to CR95HF response

Return parameter

CR95HF_SUCCESS_CODE: Function is successful.

Table 5.

CR95HF_Echo function description

Prototype

result = int8_t CR95HF_Echo (uint8_t *pResponse)

Input parameter

None

Output parameter

pResponse: Pointer to CR95HF response

Return parameter

CR95HF_SUCCESS_CODE: Function is successful.

Table 6.

CR95HF_ProtocolSelect 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(1)

Data input: Pointer to data

ISO/IEC 15693, ISO/IEC 18092, ISO/IEC 14443-3 Type A or Type B RF protocols.

Output parameter

pResponse: Pointer to CR95HF response

Return parameter

CR95HF_ERRORCODE_PARAMETER: Function failed

CR95HF_SUCCESS_CODE: Function is successful.

CR95HF_ERRORCODE_PARAMETERLENGTH: Parameter length is

incorrect.

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