NFC does not work with iphone 13 and above

[massimoklk]

Hello,

I am currently working on a program utilizing the nRF52840 with NFC capabilities. I have successfully compiled and tested the application on Android, but unfortunately, it does not seem to be functioning on iPhone.

After some research, I suspect that this issue may be related to the SDK version. Specifically, I am using SDK 17.0.2 for this project.

I would greatly appreciate your assistance in resolving this matter. If anyone has encountered a similar problem or has insights into compatibility issues with iPhone, your guidance would be invaluable.

Thank you in advance for your help.

Best regards,

[massimoklk]

i am working with the NRF52840 DK

[McRancor]

Antenna is the same, and I'm fairly sure the issue is caused by DK antenna. I see the FIELD_ON events running in cycles, but the read event is not present. An older iPhone generates typical Field On -> read -> Field off pattern.

I have also some different chips with custom made NFC antennas and they run fine. I decided to go with board design for my custom project, and will match the antenna there.

I tested just now with Iphone 11, running same OS version like the working Xr, the Iphone 11 behaves just like 13 - no read happening. That means it's not OS dependent but model.

[Joakim Jakobsen]

Thank you for your input.

Will forward this information internally.

Br,
Joakim

[McRancor]

I found the root cause for this phenomenon. SDK 14.2, 15.2 are both behaving the same. with SDK 16.0+ the problem is not visible and all iPhones work fine.

I managed to get my code stable when porting nrfx nfc driver to sdk 14.2, and by replacing the t4t lib.