M24SR02 NDEF File

[andreaskraeuchi9]

Posted on January 15, 2016 at 13:58

Hy

We're currently using the M24SR02-Y. With the ''TOL_ScriptingTool_ACR122'' software and a ACR122 NFC Reader/Writer device we store some data to a 

''Select NDEF File'' with following command:

; [1] Select NDEF File

00 A4 04 00 07 D2 76 00 00 85 01 01 00 (9000)

; [2] NDEF select command

00 A4 00 0C 02 00 01 (9000)

; [3] Write 193 Bytes data to the nfc EEPROM at position 0x00

00 D6 00 00 C1 AA 01 38 26 06 00 03 0E F0 24 FD 45 14 00 D7 11 64 00 00 00 00 00 00 00 F0 24 00 00 00 00 A8 61 00 00 00 00 B5 0B 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 0A D7 23 3C 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 00 00 80 3F 00 00 00 00 (9000)

However the NFC hangs up and doesn't write the data. The data is 193bytes which should be possible to stored in one command (max is 246bytes (Datasheet)).

When we only send 56bytes it works great however with 57bytes it already stops working so why is there a limit of 56bytes?

And how can we send the total of 193bytes?

Is there a problem with the NFC reader/writer?

Andy

[JP Miller]

Posted on January 15, 2016 at 15:28

Hello Andy,

The sequence of operations you are reporting is as expected (Select Appli, Select NDEF file, update binary). M24SR supports up to 246 bytes update binary, so 193 bytes is ok. There might be some other limitations in the system though such as buffer size. Hope this helps. Have a nice day. Best regards

[andreaskraeuchi9]

Posted on January 18, 2016 at 08:28

Thx for the reply

Regarding the buffer size is maybe the reader/writer limited what oder brands in terms of USB writer/reader do work with a M24SR?Andy

[JP Miller · Accepted solution]

Posted on January 20, 2016 at 15:04

Hello Andy,

we can recommend our USB reader/writer available from several resellers m24lr-discovery evaluation kit which could be use for developing your application, if this is what you are looking for. Best regards, Have a good day.