AN3955 datasheet(21/68 Pages) STMICROELECTRONICS

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AN3955

CR95HF low level layer

Doc ID 022017 Rev 1

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4.8

Idle function

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

consumption mode. Table 16 describes the CR95HF_Idle function.

4.9

RdReg function

This function sends an RdReg command to the CR95HF in order to read the CR95HF

internal register. Table 17 describes the CR95HF_RdReg function.

4.10

BaudRate function

This function sends a BaudRate command to the CR95HF. It allows configuring the UART

baudrate. Table 18 describes the CR95HF_BaudRate function.

For more information about this command, please refer to CR95HF datasheet.

Table 16.

CR95HF_Idle

function description

Prototype

result = int8_t CR95HF_Idle(uc8

Length,uc8 *Data,uint8_t *pResponse);

Input parameter

Length: Number of data bytes

Data: Pointer to data

Output parameter

pResponse : Pointer to the CR95HF response

Return parameter

CR95HF_ERRORCODE_PARAMETER: Function failed

CR95HF_SUCCESS_CODE: Function is successful.

CR95HF_ERRORCODE_PARAMETERLENGTH:

Parameter length is incorrect.

Table 17.

CR95HF_RdReg

function description

Prototype

result = int8_t CR95HF_RdReg(uc8

Length,uc8 Address,uc8 RegCount,uc8

Flags,uint8_t *pResponse);

Input parameter

Length : Number of bytes (Address+RegCount+Flags)

Address: Register address

RegCount: Number of bytes to read

Flags: ST reserved (must be 0x00)

Output parameter

pResponse : Pointer to CR95HF response

Return parameter

CR95HF_SUCCESS_CODE: Function is successful.

Table 18.

CR95HF_BaudRate

function description

Prototype

result = int8_t CR95HF_BaudRate (uc8

BaudRate,uint8_t *pResponse);

Input parameter

BaudRate: New baud rate = 13.56/(2*BaudRate+2) Mbps

Output parameter

pResponse : Pointer to the CR95HF response

Return parameter

CR95HF_SUCCESS_CODE: Function is successful.

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