AN4430 datasheet(30/42 Pages) STMICROELECTRONICS

30 / 42 page

How to use ST NFC package to implement HW enhanced features

AN4430

30/42

DocID025722 Rev 1

How to use ST NFC package to implement HW

enhanced features

Customer may want to use enhanced feature provided by ST-M24SR or ST-M24LR. As

these features are not NDEF dedicated our out of NFC Forum scope or not yet provided by

Android API, user may address discovered NFC Tag through Android NFC technology API

and with dedicated protocol defined by ST (or customer in case of transceiver addressing

use case).

These study examples are extracted from dedicated ST product android application. These

applications are downloadable from ST web site as Android application itself or as Android

Application source code.

3.1

Enhanced M24SR feature use case – CCFile addressing

NFC android Application developer may want to read the CC file stored in each NFC Type 4

Tag. Android API doesn’t provide a high level interface to address this kind of file. Developer

has to address specific nfc.technology provided by android to send 7816-4 commands to

access this specific file.

Once a tag is discovered from the NFC field, intent is grabbed by the current foreground

activity. With this intent, a rawTag which is the software representation of the state of the

physical tag detected by the NFC field is extractable by the following call:

If the Tag type is identified as a NFC Forum Tag Type 4 by the decodeTagType() method,

physical tag in the NFC field gets a CCFile. Developer has to request it through a sequence

of commands to be able to read it. These commands are listed in the ST-M24SR datasheet

downloadable from the ST web site.

Tag rawTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);

AN4430 Datasheet(PDF) 30 Page - STMicroelectronics