code: def swo_supported_speeds(self, cpu_speed, num_speeds=3):
          
          buf_size = num_speeds
          buf = (ctypes.c_uint32 * buf_size)()
          res = self._dll.JLINKARM_SWO_GetCompatibleSpeeds(cpu_speed, 0, buf, buf_size)
          if res < 0:
              raise errors.JLinkException(res)
  
          return list(buf)[:res]
docs: Retrives a list of SWO speeds supported by both the target and the
          connected J-Link.
  
          The supported speeds are returned in order from highest to lowest.
  
          Args:
            self (JLink): the ``JLink`` instance
            cpu_speed (int): the target's CPU speed in Hz
            num_speeds (int): the number of compatible speeds to return
  
          Returns:
            A list of compatible SWO speeds in Hz in order from highest to lowest.