IQ.Pilot Release Commit @ f82ff4d

iqdbc_repo/iqdbc/car/crc.py

@@ -0,0 +1,31 @@
+
+def _gen_crc8_table(poly: int) -> list[int]:
+  table = []
+  for i in range(256):
+    crc = i
+    for _ in range(8):
+      if crc & 0x80:
+        crc = ((crc << 1) ^ poly) & 0xFF
+      else:
+        crc = (crc << 1) & 0xFF
+    table.append(crc)
+  return table
+
+
+def _gen_crc16_table(poly: int) -> list[int]:
+  table = []
+  for i in range(256):
+    crc = i << 8
+    for _ in range(8):
+      if crc & 0x8000:
+        crc = ((crc << 1) ^ poly) & 0xFFFF
+      else:
+        crc = (crc << 1) & 0xFFFF
+    table.append(crc)
+  return table
+
+
+CRC8H2F = _gen_crc8_table(0x2F)
+CRC8J1850 = _gen_crc8_table(0x1D)
+CRC8BODY = _gen_crc8_table(0xD5)
+CRC16_XMODEM = _gen_crc16_table(0x1021)