code: def readinto(self, buf, *, start=0, end=None):
          
          self._bus.readinto(buf, start=start, end=end)
          if start == 0 and end is None and len(buf) >= 8:
              if self._bus.crc8(buf):
                  raise RuntimeError('CRC error.')
docs: Read into ``buf`` from the device. The number of bytes read will be the
          length of ``buf``.
  
          If ``start`` or ``end`` is provided, then the buffer will be sliced
          as if ``buf[start:end]``. This will not cause an allocation like
          ``buf[start:end]`` will so it saves memory.
  
          :param bytearray buf: buffer to write into
          :param int start: Index to start writing at
          :param int end: Index to write up to but not include