AN3375 datasheet(70/73 Pages) STMICROELECTRONICS

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AN3375

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Doc ID 018637 Rev 1

5.2

Application functions

The steps required to setup communications with an M24LRXX-R tag are the following:

Configure the CR95HF by issuing an M24LRXX_SelectProtocol command to select

ISO15693 protocol. The parameters passed by the command are:

Backscatter data rate set to 26 kbps (ISO15693_TRANSMISSION_26)

Modulation depth of 100% (ISO15693_MODULATION_100)

Single subcarrier for contactless tag response

(ISO15693_SINGLE_SUBCARRIER)

CRC16 management byte (M24LRXX_APPENDCRC)

M24LRXX_SelectProtocol(M24LRXX_TRANSMISSION_26,

M24LRXX_WAIT_FOR_SOF,

M24LRXX_MODULATION_100,

M24LRXX_SINGLE_SUBCARRIER,

M24LRXX_APPENDCRC);

Create a request flags according to the previous select command. The subcarrier and

data rate must match.

InventoryFlagByte = M24LRXX_CreateRequestFlag (

M24LRXX_REQFLAG_SINGLESUBCARRIER,

M24LRXX_REQFLAG_HIGHDATARATE,

M24LRXX_REQFLAG_INVENTORYFLAGSET,

M24LRXX_REQFLAG_NOPROTOCOLEXTENSION,

M24LRXX_REQFLAG_NOTAFI,

M24LRXX_REQFLAG_1SLOT,

M24LRXX_REQFLAG_OPTIONFLAGNOTSET,

M24LRXX_REQFLAG_RFUNOTSET);

Send an inventory command:

M24LRXX_InventoryOneSlot (

InventoryFlagByte ,

MAIN_DONTCARE,

M24LRXX_APPENDCRC,

MAIN_DONTCARE,

ReaderRecBuf );

Extract the different elements from the CR95HF response. The inventory response

contains a reply flag, the DSFID byte, and the contactless tag UID. The whole Split

commands checks the CRC16 residue of contactless tag reply.

status = M24LRXX_SplitInventoryResponse

( ReaderRecBuf,

Table 107.

Select command and request flag corresponding parameters

Select command parameter

Request flags parameter

M24LRXX_SINGLE_SUBCARRIER

M24LRXX_REQFLAG_SINGLESUBCARRIER

M24LRXX_TRANSMISSION_26

M24LRXX_REQFLAG_HIGHDATARATE

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