Read Write Mifare Ultralight

[trentsamone]

When using SimpleTagConnection or MFStandardConnection
can any explain to me about the read() and write() functions

SimpleTagConnection
What do the ints and bytes represent in the following :
1, conn.writeLogical(int, byte);
2, conn.readLogical(int, int);

MFStandardConnection
What do the keys, ints and bytes represent in the following :
1, block.write(key, byte, int);
2, block.read(key, byte, int, int, int);

i want to write a int to a rfid card (Mifare Ultralight)
and then be able to read it back at a later point, im useing the nokia NFC 6131 emulator

any help or example code would be much appricatiated

[cisa]

Trentsamone,

Did you ever find out the answer to your questions? If so, can you please share it?

[alixwarnke]

Why don't you look in the javadoc? It is provided with the Nokia 6131 NFC SDK

[elli.one]

Hello,

without look into Mifare UL specification MF0 IC 01 you cannot understand the API, 3.5 contains the memory organization.

But your are rigth the Nokia spec is not really clear for some
functions.

The UL cards is organized in pages (4 byte for each) 0..15.
Page locks exist for block 0..3
Some functions use the the param block number and it is not clear
what is here the block number.

writeLogical/readLogical is for the user area. User area is from byte 10..63 (UL spec) but contains Lock0,lock1 and OTP bytes.

For my feeling the real user area starts at byte 16 at page 4.
so the index from writeLogical points at offset 16 + index.

MFStandardConnection
What do the keys, ints and bytes represent in the following :
1, block.write(key, byte, int);
2, block.read(key, byte, int, int, int);

Each sector on a MIFARE STD card needs authentication for read/write. Each key contains six bytes. The normal transport key
is 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF. So with this key you normally can read a card. Block means a logial row in a sector. Each sector can contains 4 Blocks (0..3). Block 3 is a special block the sector trailer. (For Mifare 4k exits a different layout for
sector 32..39).
Sow with block.read/write you can transfer 1..16 bytes.

elli