AN4433 datasheet(14/34 Pages) STMICROELECTRONICS

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Combining standard NDEF and proprietary data in M24SR

AN4433

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DocID025791 Rev 1

Combining standard NDEF and proprietary data in

M24SR

4.1

Using an NDEF file and bytes beyond NDEF message

Configuration:

–

Standard NDEF data in NDEF message

–

Proprietary data in bytes “beyond NDEF message” see Section 3.2

Advantages:

–

NFC compliant

–

Supported by all common platforms (Android, WP)

–

“Fast” accessibility (read/write) to proprietary data, by memory addressing in

NDEF file

Drawbacks:

–

No isolation of the read/write access rights per data type

–

Proprietary data accessible only if the platform API allows proprietary commands

(not possible on Windows® Phone 8)

–

If third-party application has write access rights to NDEF file, proprietary data may

be corrupted.

Tip:

–

It is recommended to use this configuration, when NDEF file is set in Read only

for third-party application

–

A proprietary application may have suitable access rights to change the content of

the NDEF file (known write password).

4.2

Using an NDEF file with a proprietary NDEF record

Configuration:

–

Standard NDEF data in NDEF record

–

Proprietary data in NDEF proprietary record (see Section 3.2)

Advantages:

–

NFC compliant: NDEF data structure is still as specified by NFC Forum (see

Section 1.1)

–

Standard NDEF data can natively be read by all common platforms (Android™,

WP)

–

Proprietary data can be read and written by a proprietary application on all

common platforms (Android™, WP)

Drawbacks:

–

Accessibility to last record(s) may be slow, as there needs to parse all headers of

previous records, to identify the position of the expected one

–

No isolation of the read/write access rights per data type

–

An application shall take care of all records of the message, if dealing with only

one of these (as said in doc [3].)

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