AN3985 datasheet(24/105 Pages) STMICROELECTRONICS

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CR95HF low level layer

AN3985

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Doc ID 022255 Rev 2

CR95HF_IdlebyTimer function

This function sends an Idle command to CR95HF. The wake-up source is its internal timer.

4.3.4

Is functions

These functions check a parameter and return either TRUE_CODE or FALSE_CODE.

CR95HF_IsReaderResultOK function

This function checks if the CR95HF has answered a successful code.

Is_IRQ_in_Interupt_Wake_up_Condition function

This function returns whether an interrupt on IRQ_IN pin is a wake-up condition or not.

Table 28.

CR95HF_IdlebyTimer function description

Prototype

u8 CR95HF_IdlebyTimer (const u8 WakeUpSource,const u8

LFOfreq, const u8 WUperiod,const u8 MaxSleep,

CR95HF_Idle_Config* Idle_Config);

Input parameter

WakeUpSource: other source of wake-up for CR95HF than tag detecting (1)

LFOfreq: LFO frequency (2bits) (00: 32 kHz, 01: 16 kHz, 10: 8 kHz, 11: 4 kHz)

WUperiod: timeout = ( Wuperiod +1 )* MaxSleep * 256 / LFOfreq

MaxSleep: timeout = ( Wuperiod +1 )* MaxSleep * 256 / LFOfreq

For example, for a wake-up by a pulse on SPI_NSS pad, use CR95HF_IDLE_WAKEUP_SPINSS value.

For a wake-up by a pulse on IRQ_IN pad, use CR95HF_IDLE_WAKEUP_IRQ_in value.

Output parameter

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

parameters to update

Return parameter

CR95HF_SUCCESS_CODE: The command is successful.

Table 29.

CR95HF_IsReaderResultOK function description

Prototype

u8 CR95HF_IsReaderResultOK(CR95HF_ResponseReceiving*

Response,const u8 Code_OK);

Input parameter

CR95HF_ResponseReceiving* Response,

Output parameter

None

Return parameter

TRUE_CODE: CR95HF returned a successful code.

FALSE_CODE: CR95HF did not return a successful code.

Table 30.

Is_IRQ_in_Interupt_Wake_up_Condition function description

Prototype

u8 CR95HF_Is_IRQ_in_Interrupt_Wake_up_Condition(u8

WUFlags);

Input parameter

WUFlags: the byte containing the expected data

Output parameter

None

Return parameter

TRUE_CODE: An interrupt on IRQ_IN pin is a wake-up condition.

FALSE_CODE: An interrupt on IRQ_IN pin is not a wake-up condition.

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