NFC Tag Sample is not working

[Kuhaku]

I am trying to test an ST25R3911B with the NFC tag reader example on a 52840dk with the nRF52840 microcontroller. When compiling the example with the board overlay and running the code, I get the following error after attempting to read a card:

Anticollision: 0x8 Platform: 0x0.

Tag info, type: 1.

Type 4 Tag.

NFC T4T selected.

I: R-APDU status: 6A82

I: R-APDU no data field present.

E: NFC T4T R-APDU received status: 27266 different than command completed.

NFC Type 4 Tag HL data received error: -1.

I understand that it is able to identify that it is a Type 4 tag, but then it fails and returns -1. Any idea why?

[Einar Thorsrud]

Hi,

It seems nfc_t4t_hl_procedure_on_data_received() returned -EPERM, which it will do if the APDU response is anything other than NFC_T4T_APDU_RAPDU_STATUS_CMD_COMPLETED. Can you check with a debugger to see more what happens? First of all, which status you get?

[Kuhaku]

Hi,

I think I've found the error. Could it be because it's trying to read a T4T that doesn't contain information? If the issue indeed stems from this, is there a way to fix it? My goal is not really to read the content of the tag itself but simply to obtain the UID/serial number/identifier of the tag. Is this possible? I've been able to do this with T2T but I can't figure out how to do it with T4T. Thank you very much.

[Einar Thorsrud]

Hi,

You are probably right. You et the status 0x6A82 = NFC_T4T_APDU_RAPDU_STATUS_SEL_ITEM_NOT_FOUND from the tag, so you are trying to read something that does not exist. Unfortunately we do not have code for reading Type 4 UID in the SDK.