mirror of
https://github.com/maziggy/bambuddy.git
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132 lines
3.9 KiB
Python
132 lines
3.9 KiB
Python
"""NFC reader wrapper with state machine for tag presence detection."""
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import logging
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import time
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from enum import Enum, auto
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logger = logging.getLogger(__name__)
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MISS_THRESHOLD = 3 # Consecutive misses before declaring tag removed
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class NFCState(Enum):
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IDLE = auto()
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TAG_PRESENT = auto()
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class NFCReader:
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def __init__(self):
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from read_tag import PN5180
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self._nfc = PN5180()
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self._state = NFCState.IDLE
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self._current_uid: str | None = None
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self._current_sak: int | None = None
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self._miss_count = 0
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self._ok = False
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try:
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self._nfc.reset()
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self._nfc.load_rf_config(0x00, 0x80)
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time.sleep(0.010)
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self._nfc.rf_on()
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time.sleep(0.030)
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self._nfc.set_transceive_mode()
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self._ok = True
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logger.info("NFC reader initialized")
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except Exception as e:
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logger.error("NFC reader init failed: %s", e)
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@property
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def ok(self) -> bool:
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return self._ok
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@property
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def state(self) -> NFCState:
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return self._state
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@property
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def current_uid(self) -> str | None:
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return self._current_uid
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def close(self):
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try:
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self._nfc.rf_off()
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self._nfc.close()
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except Exception:
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pass
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def poll(self) -> tuple[str, dict | None]:
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"""Poll for tag. Returns (event_type, event_data).
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event_type: "none", "tag_detected", "tag_removed"
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"""
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try:
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result = self._nfc.activate_type_a()
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except Exception as e:
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logger.debug("NFC poll error: %s", e)
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self._ok = False
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return "none", None
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self._ok = True
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if result is not None:
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uid_bytes, sak = result
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uid_hex = uid_bytes.hex().upper()
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self._miss_count = 0
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if self._state == NFCState.IDLE:
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self._state = NFCState.TAG_PRESENT
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self._current_uid = uid_hex
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self._current_sak = sak
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# Try reading Bambu tag data
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tray_uuid = None
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tag_type = "mifare_classic" if sak in (0x08, 0x18) else "ntag" if sak == 0x00 else "unknown"
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if sak in (0x08, 0x18):
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blocks = self._nfc.read_bambu_tag(uid_bytes)
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if blocks:
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tray_uuid = _extract_tray_uuid(blocks)
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logger.info("Tag detected: %s (SAK=0x%02X)", uid_hex, sak)
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return "tag_detected", {
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"tag_uid": uid_hex,
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"sak": sak,
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"tag_type": tag_type,
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"tray_uuid": tray_uuid,
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}
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# Tag still present — no event
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return "none", None
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# No tag found
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if self._state == NFCState.TAG_PRESENT:
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self._miss_count += 1
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if self._miss_count >= MISS_THRESHOLD:
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old_uid = self._current_uid
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self._state = NFCState.IDLE
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self._current_uid = None
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self._current_sak = None
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self._miss_count = 0
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logger.info("Tag removed: %s", old_uid)
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return "tag_removed", {"tag_uid": old_uid}
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return "none", None
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def _extract_tray_uuid(blocks: dict[int, bytes]) -> str | None:
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"""Extract tray_uuid from Bambu MIFARE Classic data blocks."""
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# Block 4-5 contain the 32-char tray UUID (first 16 bytes from block 4 + 5)
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if 4 in blocks and 5 in blocks:
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raw = blocks[4] + blocks[5]
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# UUID is stored as ASCII hex in the first 16 bytes of blocks 4-5
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uuid_bytes = raw[:16]
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try:
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uuid_str = uuid_bytes.hex().upper()
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if uuid_str and uuid_str != "0" * 32:
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return uuid_str
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except Exception:
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pass
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return None
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