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Fix NTAG read loop: IDLE→TRANSCEIVE once, set_transceive_mode after

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Repeated IDLE→TRANSCEIVE resets inside the read loop broke the card
  session after the first READ (page 8 returned rx_status=0). Match
  the activate_type_a pattern: IDLE→TRANSCEIVE once before the loop,
  set_transceive_mode() for subsequent iterations.
This commit is contained in:
maziggy
2026-03-25 13:33:04 +01:00
parent 85ffb9e01f
commit a59c81d6a6
1 changed files with 17 additions and 13 deletions
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spoolbuddy/daemon/pn5180.py
+17 -13
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@@ -378,21 +378,26 @@ class PN5180:
Uses NTAG READ command (0x30) which returns 4 pages (16 bytes) at a time.
"""
# 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:
# CRC and state machine setup per iteration (same as ntag_write_page)
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
# Reset state machine: IDLE then TRANSCEIVE
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)
if pages_read > 0:
# Subsequent iterations: just clear IRQs and re-enter TRANSCEIVE
self.write_reg(0x03, 0xFFFFFFFF)
self.set_transceive_mode()
time.sleep(0.001)
# READ command: 0x30 + page number -> returns 16 bytes (4 pages)
self.send_data([0x30, start_page + pages_read])
@@ -410,7 +415,6 @@ class PN5180:
return None
data = self.read_data(16)
# Copy only the pages we need
pages_to_copy = min(4, num_pages - pages_read)
result.extend(data[: pages_to_copy * 4])
pages_read += 4 # Always advances by 4 (READ returns 4 pages)