Hallo Shekhar,
> Really appreciate for the enlightment.Now as per my understanding, in
> the Android system NDEF class can be used for the NFC Forum Tag Type
> 1,2,3,4 and NFC P2P
> communication.
NDEF is an abstraction of the actual data structures on an NFC tag or
for peer-to-peer communication. Thus, with NDEF you don't need to care
about what technology is used below that data format.
NDEF can be used for peer-to-peer and on NFC tags (1 to 4) and, with the
Nexus S and some other phones, on certain vendor specific tag types like
MIFARE Classic and ICODE.
While we have to make use of the specific Android
> Classes for:-
>
> 1.ISODEP -> IsoDep Class
> 2.MIFARECLASSIC -> MifareClassic class
> 3.NFCA -> NfcA class
> 4.NFCB -> NfcB class
> 5.NFCF -> NfcF class
> 6.NFCV -> NfcV class
If you want to use specific features of these technologies outside the
comfort of NDEF you would have to use these technology specific classes.
> // Check which type of tags was discovered
> switch(tagtype)
> {
> // do operation as per your need using the [specific] Class
> Apis
> break;
> ...........
> }
>
> Am I correct?
Correct.
br
Michael
>>
>>> On 18 May 2011 10:10, Michael Roland <[email protected]> wrote:
>>
>>>> Hallo Shekhar,
>>
>>>> NDEF is a data exchange format for NFC (NDEF = NFC Data Exchange
>>>> Format). It can be used with NFC tags (reader-writer mode) and in peer-
>>>> to-peer mode.
>>
>>>> The NFC Forum Type tag formats specify a standardized way to store
>>>> NDEF data (and possibly other data) onto certain tags. So these
>>>> specifications define the tags' data structures and commands to access
>>>> the data. The four tag types are based on previously existing vendor
>>>> specific RFID tag types:
>>
>>>> NFC Forum Tag Type 1 is based on Innovision Topaz/Jewel
>>>> NFC Forum Tag Type 2 is based on NXP MIFARE Ultralight
>>>> NFC Forum Tag Type 3 is based on Sony FeliCa
>>>> NFC Forum Tag Type 4 is based on APDU-based smart cards
>>
>>>> Besides these standard tag types NXP released application notes that
>>>> define ways to store NDEF formatted data onto other RFID tag types
>>>> (application notes are available for MIFARE Classic and for ICODE).
>>
>>>> As the tag types are based on existing RFID tag technologies, they
>>>> also correspond to certain RFID/smartcard standards:
>>
>>>> NFC Forum Tag Type 1 sits on top of ISO/IEC 14443-3 Type A (but
>>>> without anti-collision!)
>>>> NFC Forum Tag Type 2 sits on top of ISO/IEC 14443-3 Type A
>>>> NFC Forum Tag Type 3 sits on top of JIS X 6319-4
>>>> NFC Forum Tag Type 4 sits on top of ISO/IEC 14443-4 and ISO/IEC 7816-4
>>
>>>> Corresponding to the ISO NFC standards (ISO/IEC 18092, ...), the NFC
>>>> Forum combined certain RFID standards to the NFC Digital Protocol. The
>>>> digital protocol has three RFID technologies named NFC-A, NFC-B and
>>>> NFC-F:
>>
>>>> NFC-A matches the RFID standard ISO/IEC 14443-3 Type A
>>>> NFC-B matches the RFID standard ISO/IEC 14443-3 Type B
>>>> NFC-F matches the RFID standard FeliCa JIS X 6319-4 (or rather those
>>>> parts of that standard that were incorporated by ISO/IEC 18092)
>>
>>>> Additionally, the Nexus S (or the NXP chip thats inside it)
>>>> understands a forth RFID technology that uses the same frequency as
>>>> NFC but is that not really related to NFC: ISO/IEC 15693 (called NFC-V
>>>> in the Android API, where V stands for Vicinity as the ISO standard
>>>> refers to this technology as vicinity cards).
>>
>>>> ISO-DEP is the data exchange protocol on top of ISO/IEC 14443-4. It is
>>>> based on the same command exchange protocol that is used with contact
>>>> smartcards: ISO/IEC 7816-4. ISO/IEC 14443-4 joins the two low-level
>>>> protocols defined in ISO/IEC 14443-3 into one common high-level
>>>> protocol.
>>
>>>> br,
>>>> Michael
>>
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