Retrieves information about supported target interface speeds.

        Args:
          self (JLink): the ``JLink`` instance

        Returns:
          The ``JLinkSpeedInfo`` instance describing the supported target
          interface speeds.

def speed_info(self):
        """Retrieves information about supported target interface speeds.

        Args:
          self (JLink): the ``JLink`` instance

        Returns:
          The ``JLinkSpeedInfo`` instance describing the supported target
          interface speeds.
        """
        speed_info = structs.JLinkSpeedInfo()
        self._dll.JLINKARM_GetSpeedInfo(ctypes.byref(speed_info))
        return speed_info