def crc8_pedal(data):
  crc = 0xFF    # standard init value
  poly = 0xD5   # standard crc8: x8+x7+x6+x4+x2+1
  size = len(data)
  for i in range(size - 1, -1, -1):
    crc ^= data[i]
    for _ in range(8):
      if ((crc & 0x80) != 0):
        crc = ((crc << 1) ^ poly) & 0xFF
      else:
        crc <<= 1
  return crc