code: def trace_set_format(self, fmt):
          
          cmd = enums.JLinkTraceCommand.SET_FORMAT
          data = ctypes.c_uint32(fmt)
          res = self._dll.JLINKARM_TRACE_Control(cmd, ctypes.byref(data))
          if (res == 1):
              raise errors.JLinkException('Failed to set trace format.')
          return None
docs: Sets the format for the trace buffer to use.
  
          Args:
            self (JLink): the ``JLink`` instance.
            fmt (int): format for the trace buffer; this is one of the attributes
              of ``JLinkTraceFormat``.
  
          Returns:
            ``None``