AN3375 datasheet(12/73 Pages) STMICROELECTRONICS

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CR95HF low level layer

AN3375

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Doc ID 018637 Rev 1

2.3.1

IDN function

This function sends an IDN command. The CR95HF returns its version number.

2.3.2

Echo function

This function sends an EchoCode command to the CR95HF which returns an Echo code

response (0x55). The Echo function checks that communications can be started between

the MCU and the CR95HF.

Table 2.

CR95HF library additional function

Function name

Brief description

CR95HF_SendEOF

Send EOF pulse

CR95HF_FieldOff

Switch off RF field

CR95HF_HexCommandToStringCommand

Translate hexadecimal command code to

command name

CR95HF_GetReaderErrorCode

Translate hexadecimal error code to error code

description

CR95HF_IsReaderResultCodeOk

Checks if returned code is succeeded code

CR95HF_IsReaderErrorCode

Checks if returned code is error code

CR95HF_IsCommandExists

Checks if command is available

Table 3.

CR95HF_IDN function description

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

Table 4.

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

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