code: def trace_buffer_capacity(self):
          
          cmd = enums.JLinkTraceCommand.GET_CONF_CAPACITY
          data = ctypes.c_uint32(0)
          res = self._dll.JLINKARM_TRACE_Control(cmd, ctypes.byref(data))
          if (res == 1):
              raise errors.JLinkException('Failed to get trace buffer size.')
          return data.value
docs: Retrieves the trace buffer's current capacity.
  
          Args:
            self (JLink): the ``JLink`` instance.
  
          Returns:
            The current capacity of the trace buffer.  This is not necessarily
            the maximum possible size the buffer could be configured with.