AN3985 datasheet(27/105 Pages) STMICROELECTRONICS

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AN3985

CR95HF low level layer

Doc ID 022255 Rev 2

27/105

CR95HF_Wait_Wake_up_From_Idle function

The purpose of this function is to wait for CR95HF to exit the idle state and retrieve what

caused the wake-up. The method proposed is to wait for the CR95HF answer and then to

send several echo commands in order to resume communication and clear the CR95HF

response FIFO stack.

This function waits for CR95HF to wake-up on its own (internal timer, tag detection).

After this, the CR95HF_Wake_up_CR95HF function may be called to wake-up the CR95HF

with NNS or IRQ_IN interrupt.

CR95HF_Wake_up_CR95HF function

This function wakes up the CR95HF device from idle mode. The method proposed is to

send several echo commands in order to resume communication and clear the CR95HF

response FIFO stack.

Table 36.

CR95HF_Wait_Wake_up_From_Idle function description

Prototype

u8 CR95HF_Wait_Wake_up_from_Idle(CR95HF_ResponseReceiving*

CR95HF_Response_Idle,CR95HF_Idle_Config* Idle_Config, u8

Number_of_DELAY_BEFORE_TIMEOUT_250MS);

Input parameter

Idle_Config: pointer on the structure to update with the new last reason of wake-up

Number_of_DELAY_BEFORE_TIMEOUT_250MS: number of periods of

250ms duration to wait before aborting the procedure

Output parameter

Idle_Config: pointer on the structure to write the High compare value and low

compare value for tag detection and the last wake-up reason

Return parameter

EXIT_COMMUNICATION_OK (CR95HF_SUCCESS_CODE): communication is

possible.

EXIT_COMMUNICATION_TIMEOUT: communication is not possible.

Table 37.

CR95HF_Wake_up_CR95HF function description

Prototype

u8 CR95HF_Wake_up_CR95HF(CR95HF_Idle_Config* Idle_Config);

Input parameter

Idle_Config: contains the wake-up condition

Output parameter

None

Return parameter

CR95HF_SUCCESS_CODE: the CR95HF woke up, communication is possible.

CR95HF_ERROR_CODE: fail to wake-up the CR95HF, either the CR95HF waits

for another event (tag detection, timer) or communication cannot be resumed.

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