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Fix Read Tag diagnostic failing on NTAG tags

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The read_tag.py diagnostic script had stale PN5180 NTAG methods: TX CRC
  was off (should be on), no Crypto1 clear, no IDLE→TRANSCEIVE state
  reset, and multi-batch reads failed because the PN5180 can't issue
  consecutive NTAG READs without a full RF power cycle. Added extended-
  timing reactivation (50ms gaps vs 10ms) between 4-page batches. Also
  rejected SAK 0x04 as unsupported. Synced write methods with daemon.
This commit is contained in:
maziggy
2026-03-26 10:28:25 +01:00
parent 0aeee26b3e
commit cd92d0099e
1 changed files with 32 additions and 21 deletions
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spoolbuddy/scripts/read_tag.py
+32 -21
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@@ -372,36 +372,47 @@ class PN5180:
return self.read_data(16)
def _ntag_reactivate(self) -> bool:
"""RF cycle with extended timing for NTAG re-selection between reads."""
self.rf_off()
time.sleep(0.050) # 50ms RF gap — NTAG needs longer than MIFARE Classic
self.write_reg(0x03, 0xFFFFFFFF) # Clear IRQs
self.load_rf_config(0x00, 0x80) # ISO 14443A
time.sleep(0.010)
self.rf_on()
time.sleep(0.050) # Let tag power up fully
return self.activate_type_a() is not None
def ntag_read_pages(self, start_page: int, num_pages: int) -> bytes | None:
"""Read NTAG pages (4 bytes each). No authentication required.
Uses NTAG READ command (0x30) which returns 4 pages (16 bytes) at a time.
Reads all requested pages in a single activated session — the card must
already be selected via activate_type_a() or reactivate_card().
The PN5180 cannot issue consecutive NTAG READs in one session — the card
stops responding after the first READ. We do a full RF cycle and re-select
with extended timing between each 4-page batch.
"""
# One-time setup: Crypto1 off, TX CRC on, RX CRC off, IDLE→TRANSCEIVE
self.write_reg_and(0x00, 0xFFFFFFBF) # Crypto1 off
self.write_reg_or(0x19, 0x01) # TX CRC on
self.write_reg_and(0x12, 0xFFFFFFFE) # RX CRC off
self.write_reg(0x03, 0xFFFFFFFF) # Clear IRQs
sys_cfg = self.read_reg(0x00)
self.write_reg(0x00, sys_cfg & 0xFFFFFFF8) # IDLE
time.sleep(0.001)
self.write_reg(0x00, (sys_cfg & 0xFFFFFFF8) | 0x03) # TRANSCEIVE
time.sleep(0.002)
result = bytearray()
pages_read = 0
while pages_read < num_pages:
if pages_read > 0:
self.write_reg(0x03, 0xFFFFFFFF) # Clear IRQs
# IDLE → TRANSCEIVE to reset state machine
sys_cfg = self.read_reg(0x00)
self.write_reg(0x00, sys_cfg & 0xFFFFFFF8)
time.sleep(0.001)
self.write_reg(0x00, (sys_cfg & 0xFFFFFFF8) | 0x03)
time.sleep(0.002)
if not self._ntag_reactivate():
print(f" Failed to reactivate card before page {start_page + pages_read}")
return None
# Setup: Crypto1 off, TX CRC on, RX CRC off, IDLE→TRANSCEIVE
self.write_reg_and(0x00, 0xFFFFFFBF)
self.write_reg_or(0x19, 0x01)
self.write_reg_and(0x12, 0xFFFFFFFE)
self.write_reg(0x03, 0xFFFFFFFF)
sys_cfg = self.read_reg(0x00)
self.write_reg(0x00, sys_cfg & 0xFFFFFFF8) # IDLE
time.sleep(0.001)
self.write_reg(0x00, (sys_cfg & 0xFFFFFFF8) | 0x03) # TRANSCEIVE
time.sleep(0.002)
# READ command: 0x30 + page → returns 16 bytes (4 pages)
self.send_data([0x30, start_page + pages_read])