Mifare DesFire Read Write(T4T)

[sach.56215330888194E12]

Hi,

    I'm using ST25r3911 for my project and have to work on DESFire card. I know there is code support for ISO/IEC 14443 cards on ​STSW-ST25R002. We can use DESFire as T4T for read and write. Is there any example of how to perform read/write?

Also is there any support for Authentication on STSW SDK?

[Brian TIDAL]

Hi,

rfal_t4t.c provides API to compose ISO 7816 APDU. Some examples of how to use these API can be found in X-CUBE-NFC5 package (file ndef_t4t.c).

Rgds

BT

[Ulysses HERNIOSUS]

Hi,

we don't have sample code showing how to do things like authentication. However the interface described by Brian allows you to send any APDUs to perform authentication.

Regards, Ulysses

[sach.56215330888194E12]

​Hi Brain/Ulysses,

          Thanks a lot for your recommendations. Actually I have an old version of NFC5 package(ver 1.2) which apparently doesn't have ndef files.

          So I started working on the code which was provided on that version in demo.c to send APDU for select app, select file and read binary.

          I was able to communicate successfully with the tag for the select functions but somehow got stuck on read binary which I'm sorting out now.

          Meanwhile I downloaded NFC5&NFC6 latest versions to check the functionalities.

           When I compare the main function(ISO-DEP Blocking Transceive) to exchange APDU on these 2 versions and the older one which I have it's still the same. Which means nothing much have changed on the Tx/Rx part but yes there is lot of changes when it comes to how the apdu's are packaged and other variables.

         Just want to confirm...Can I continue working on NFC5 version 1.2 for the other apdu's like read and write or should I get the latest NFC package version?

        My only worry is that I need to port in lot of code changes from the new version and I'm kind of going low on memory.

Regard,

Sach

[Brian TIDAL]

Hi,

for your information,

• the memory footprint can be reduced thanks to the RFAL_FEATURE_*** macros in your platform.h file. e.g. set RFAL_FEATURE_NFC_DEP to false if NFC_DEP is not used in your project
• if you are using Keil tools, the linker can be instructed to remove unused code/data/section
• if you are using Iar tools, the linker by default remove unused code

I personally would recommend to move to the latest version of the RFAL.

Rgds

BT