Parser for CC files

To detect and access NDEF data, the NFC reader uses the capability container (CC) file that is contained inside the NDEF tag application. The CC file is a read-only file that contains management data for the Type 4 Tag platform, for example, information about the implemented specification and other capability parameters of the tag. The file identifier of the CC file is E103h.

This library provides functions to parse raw CC file data to its descriptor structure. In this way, you can use it to print out the tag content.

CC file content

The parser outputs the following data:

Field name	Description
CCLEN	Size of the CC file.
Mapping Version	Tag 4 Tag version number.
MLe	Maximum R-APDU data size.
MLc	Maximum C-APDU data size.
Extended NDEF/NDEF File Control TLV	Management data for NDEF file with its payload.
TLV Block	(see below)

Certain types of TLV blocks are supported by Type 4 Tag:

TLV Block name	Tag field value	Length field value
NDEF File Control TLV	04h	06h
Proprietary File Control TLV	05h	06h
Extended NDEF File Control TLV	06h	08h

More detailed information about each TLV block inside Type 4 Tag is also printed out:

Field name	Description
File identifier	Used for the Select procedure.
Maximum file size	Maximum capacity of the file (in bytes).
Read access condition	Read access level of the file.
Write access condition	Write access level of the file.

Optionally, the content of the file that is described by the TLV block can also be printed out. However, to do so, you must call an additional function that binds the TLV structure with the described file content.

API documentation

Header file: include/nfc/t4t/cc_file.h

Source file: subsys/nfc/t4t/cc_file.c

CC file parser