topic Can ARM Core read out NHS3100 NFC UID? in NFC

Can ARM Core read out NHS3100 NFC UID?

Harley — Wed, 06 Jan 2021 06:31:33 GMT

Hi Sir,

I read that All NHS devices have a user memory of 888 bytes (222 pages). Of these, 512 bytes (128
pages) are accessible (R/W) by the ARM. The first 4 pages (R) and the last 90 pages (R/
W) are only accessible by the PCD.

I want to know if there is a way for the arm core to read the NFC UID?

Many Thanks.

Harley

Re: Can ARM Core read out NHS3100 NFC UID?

driesmoors — Wed, 06 Jan 2021 11:06:39 GMT

Hi,

The NFC ID in the NFC memory cannot be read out by the ARM core, but during production a copy is written into the RO ARM EEPROM rows.
Your code can access the NFC ID via the define NSS_NFC_UID_BASE which is a pointer to the correct location. See chip.h.

This is used in the demo firmware. See GetNfcUidHandler in msg.c

Kind regards,
Dries.

Re: Can ARM Core read out NHS3100 NFC UID?

Harley — Thu, 07 Jan 2021 01:58:30 GMT

@driesmoors

This was useful, Thank you for replying!