AN3985 datasheet(13/105 Pages) STMICROELECTRONICS

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AN3985

CR95HF low level layer

Doc ID 022255 Rev 2

13/105

CR95HF low level layer

This layer is composed of:

●

the lib_CR95HF.c source file

●

the lib_CR95HF.h include file

4.1

Overview

This layer supports all the commands defined in the CR95HF datasheet. Each CR95HF

command corresponds to a specific function. As an example, the function calling the ECHO

command is u8 CR95HF_Echo (void).

Additional functions are described in Table 8: CR95HF layer additional functions.

Application developers can use the functions described in Table 7: CR95HF layer functions

based on CR95HF commands to create their own higher level functions.

Refer to the CR95HF datasheet for more details on the commands.

4.2

Structures

4.2.1

Command format

A command from MCU to CR95HF is composed of three fields:

●

command code

●

length

●

data

The dedicated structure is CR95HF_CommandSending.

Table 2 lists the fields of a generic command to CR95HF, the number of bytes and the name

of the dedicated structure member.

The structure definition of a command to CR95HF is:

typedef struct

{

u8 cmd_code;

u8 data_length;

u8 data[MAX_DATASENT_LENGTH];

}CR95HF_CommandSending;

Table 2.

Command fields formats

Field

Length

Dedicated structure

Command code

1 byte

cmd_code

Length

1 byte

data_lenght

Data

Up to 255 bytes

data

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