AN3985 datasheet(14/105 Pages) STMICROELECTRONICS

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CR95HF low level layer

AN3985

14/105

Doc ID 022255 Rev 2

4.2.2

Response format

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

●

response code

●

length

●

data

The dedicated structure is CR95HF_ResponseReceiving.

Table 3 lists the fields of a generic response from CR95HF, the number of bytes and the

name of the dedicated structure member.

The structure definition of a response from CR95HF is:

typedef struct

{

u8 resp_code;

u8 data_length;

u8 data[MAX_DATARECEIVED_LENGTH];

}CR95HF_CommandSending;

4.2.3

Protocol selection structure

The CR95HF can use different RF protocols:

●

ISO/IEC 14443 type A or type B

●

ISO/IEC 15693

●

ISO/IEC 18092

Each protocol has its own parameters.

The Protocol_Config structure displays the RF protocol parameters.

Table 4 lists the protocol parameters.

The structure definition of a protocol selection structure is:

typedef struct

{

Table 3.

Response field formats

Field

Length

Dedicated structure

RF protocol

1 byte

resp_code

Length

1 byte

data_lenght

Data

Up to 255 bytes

data

Table 4.

Protocol parameter formats

Field

Length

Dedicated structure

Response code

1 byte

protocol_in_use

Length

1 byte

parameters_lenght

Data

Up to 3 bytes

parameters

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