AN3985 datasheet(22/105 Pages) STMICROELECTRONICS

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CR95HF low level layer

AN3985

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Doc ID 022255 Rev 2

4.3.2

Additional functions

CR95HF_SendEOF function

This function sends an EOF. This can be used for instance in an ISO/IEC 15693 inventory or

write command. Right after the EOF, the tag could answer a command (Write or Inventory),

so the response is received and written into the provided structure.

CR95HF_FieldOff function

This function switches off the RF Field using the protocol select command.

4.3.3

Low power mode functions

These functions send an idle command with some parameters forced into the function.

CR95HF_Hibernate function

This function sends an Hibernate command to CR95HF and turns the hibernate state on.

This is the lowest consumption state of CR95HF. Only a pulse on IRQ_IN pin can wake-up

the CR95HF.

Table 23.

CR95HF_SendEOF function description

Prototype

u8 CR95HF_SendEOF(CR95HF_ResponseReceiving* Response);

Input parameter

None

Output parameter

Response: pointer on the structure which will contain the Tag answer

Return parameter

CR95HF_SUCCESS_CODE: The command is successful.

CR95HF_ERROR_CODE: The command failed.

Table 24.

CR95HF_FieldOff function description

Prototype

u8 CR95HF_FieldOff(CR95HF_Protocol_Config*

Protocol_Settings);

Input parameter

Protocol_Settings: structure to update

Output parameter

None

Return parameter

CR95HF_SUCCESS_CODE: The field was successfully turned off

CR95HF_ERROR_INVALID_PROTOCOL: The selected protocol is wrong.

CR95HF_ERROR_INVALID_CMD_LENGTH: The command length is invalid.

CR95HF_ERROR_CODE: The command failed

Table 25.

CR95HF_Hibernate function description

Prototype

u8 CR95HF_Hibernate (CR95HF_Idle_Config* Idle_Config);

Input parameter

None

Output parameter

Idle_Config: pointer on the structure which contains data about some idle

parameters to update.

Return parameter

CR95HF_SUCCESS_CODE: The command is successful.

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