code: def swo_set_emu_buffer_size(self, buf_size):
          
          buf = ctypes.c_uint32(buf_size)
          res = self._dll.JLINKARM_SWO_Control(enums.JLinkSWOCommands.SET_BUFFERSIZE_EMU,
                                               ctypes.byref(buf))
          if res < 0:
              raise errors.JLinkException(res)
  
          return None
docs: Sets the size of the buffer used by the J-Link to collect SWO data.
  
          Args:
            self (JLink): the ``JLink`` instance
            buf_size (int): the new size of the emulator buffer
  
          Returns:
            ``None``
  
          Raises:
            JLinkException: on error