AN3985 datasheet(19/105 Pages) STMICROELECTRONICS

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AN3985

CR95HF low level layer

Doc ID 022255 Rev 2

19/105

CR95HF_SendRecv function

This function sends a SendRecv command. The parameter passed to the command is the

frame, which is coded according to the protocol previously selected by issuing a Protocol

Select command. The CR95HF encodes the frame, transmits it at 13.56 MHz, and decodes

the contactless tag response.

The Parameters of input parameter depend on the selected protocol. Table 15 gives

ISO/IEC 15693 protocol parameters.

In case of a correct response, the SendRecv response sent to MCU is as follows:

In case of an error response, the SendRecv response sent to MCU is as follows:

For more details, please refer to the CR95HF datasheet.

Table 16.

CR95HF_SendRecv function description

Prototype

u8 CR95HF_SendRecv(CR95HF_ResponseReceiving*

Response,const

CR95HF_CommandSending* Command);

Input parameter

Command: the command structure to send to a contactless tag

Output parameter

Response: pointer on the response structure

Return parameter

CR95HF_SUCCESS_CODE: The command is successful.

CR95HF_ERROR_CODE: The command failed. Response contains

the right error code.

Table 17.

SendRecv correct response

Parameter name

Byte

Bit

Value

Example

Result Code

7:0

0x80

0x800D0000FA20563C172202E

0746800

with:

: success code

: number of bytes

0000FA20563C172202E0

contactless tag data

7468

: CRC

: control byte

Length

7:0

0xXX

Data

2:X

7:0

0xXX

CRC

X+2:X+3

7:0

0xXX

Control byte

X+4

7:2

RFU

CRC error if set

Collision detected if set

Table 18.

SendRecv error response

Parameter name

Byte

Bit

Value

Example

Result Code

7:0

0x8X

0x 87 00

: no tag in

the field

Length

7:0

0x00

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