AN3985 datasheet(20/105 Pages) STMICROELECTRONICS

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CR95HF low level layer

AN3985

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Doc ID 022255 Rev 2

CR95HF_Idle function

This function sends an Idle command to the CR95HF to switch the CR95HF device into low

consumption mode.

Note:

Some Low power mode commands using the Idle command are defined in Chapter 4.3.3:

Low power mode functions

CR95HF_Rd_Wake_up_Reg function

This function reads the wake-up register of the CR95HF to determine what has caused the

awakening of the CR95HF after an Idle command.

Table 19.

CR95HF_Idle function description

Prototype

u8 CR95HF_Idle (const

u8 WakeUpFlags,const

EnterCtrlL,const

u8 EnterCtrlH, const u8

WUCtrlL,const

u8 WUCtrlH,const

LeaveCtrlL,const

LeaveCtrlH ,const u8

WUPeriod,const

u8 OscStart,const

DacStart,const

u8 DacDataL,const

DacDataH,const

u8 SwingsCnt,const

u8 MaxSleep,

CR95HF_Idle_Config* Idle_Config);

Input parameter

WakeUpFlags: Specifies wake-up condition.

EnterCtrlL: first byte of setting to enter to Idle mode

EnterCtrlH: second byte of setting to enter to Idle mode

WUCtrlL: first byte of setting to wake-up from Idle mode

WUCtrlH: second byte of setting to wake-up from Idle mode

LeaveCtrlL: first byte of setting to leave Idle mode

LeaveCtrlH: second byte of setting to leave Idle mode

WUPreiod: period of time between two tags detection

OscStart: waiting time to stabilize HFO

DacStart: waiting time to stabilize DAC

DacDataL: lower compare value for tag detection

DacDataH: higher compare value for tag detection

SwingsCnt: number of HF swings during tag detection

MaxSleep: maximum number of tag detection trials before timeout

Output parameter

Idle_Config: pointer on the Idle structure

Return parameter

CR95HF_SUCCESS_CODE: The command is successful.

Table 20.

CR95HF_Rd_Wake_up_Reg function description

Prototype

u8 CR95HF_Rd_Wake_up_Reg(CR95HF_ResponseReceiving*

Response,CR95HF_Idle_Config* Idle_Config);

Input parameter

None

Output parameter

Response: pointer on the structure to fill in with the data retrieved

Idle_Config: pointer on the structure to update

Return parameter

CR95HF_SUCCESS_CODE: The command is successful.

CR95HF_ERROR_INVALID_CMD_LENGTH:The command failed,

invalid length.

CR95HF_ERROR_CODE: Command failed, response contains the

error code.

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