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feat(registers): NTAG I2C plus config/session/PT_I2C registers

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Add self-describing registers for the NTAG I2C plus (NT3H2111/2211),
decoded bit-exact from the NT3H2111 datasheet (Tables 10-14):

- NtagI2CConfig   config registers E8h/E9h (NC_REG: pass-through, FD_ON/
                  FD_OFF, SRAM mirror, transfer dir; LAST_NDEF_BLOCK;
                  SRAM_MIRROR_BLOCK; watchdog; I2C_CLOCK_STR; REG_LOCK)
- NtagI2CSession  session registers ECh/EDh — same NC_REG copy plus the
                  NS_REG status byte and NEG_AUTH_REACHED
- NtagI2CPtI2C    PT_I2C (E7h): 2K_PROT / SRAM_PROT / I2C_PROT

Config and session share one _NtagI2CRegBlock base (byte 6 differs:
REG_LOCK vs NS_REG). Bound via tag.config / tag.session / tag.pt_i2c;
the fresh-tag decode matches the shipped defaults. 7 new tests.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
michael
2026-07-14 08:45:39 -07:00
parent 2063a33a2b
commit 0f597bc933
4 changed files with 199 additions and 5 deletions
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CLAUDE.md
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@@ -57,10 +57,11 @@ pm3py/
replay.py # Trace replay
access_control/ # Wiegand, OSDP
transponders/ # tag/transponder models (extracted from sim/)
bitfield.py # BitField descriptor + Register base — self-describing config
# registers (T5577Config, Ntag21xConfig, UL EV1/C, MFC access
# bits). Fields are documented attrs -> shell completion + repr
# decode table. Layouts cross-checked vs the firmware submodule.
bitfield.py # BitField descriptor + Register base — self-describing config/
# frame registers (T5577, EM4100, NTAG21x, Ultralight EV1/C, MFC
# access bits, NTAG I2C NC_REG/NS_REG/REG_LOCK/PT_I2C). Fields are
# documented attrs -> shell completion + repr decode table.
# Layouts cross-checked vs the firmware submodule + NXP datasheets.
hf/iso14443a/ # Tag14443A_3/4, MifareClassic, DESFire, NfcType2/4
# nxp/type2,ntag21x,ultralight,ntag_i2c
# (NTAG210-216, Ultralight/C/EV1, NTAG I2C plus)