code: def supported_device(self, index=0):
          
          if not util.is_natural(index) or index >= self.num_supported_devices():
              raise ValueError('Invalid index.')
  
          info = structs.JLinkDeviceInfo()
  
          result = self._dll.JLINKARM_DEVICE_GetInfo(index, ctypes.byref(info))
          return info
docs: Gets the device at the given ``index``.
  
          Args:
            self (JLink): the ``JLink`` instance
            index (int): the index of the device whose information to get
  
          Returns:
            A ``JLinkDeviceInfo`` describing the requested device.
  
          Raises:
            ValueError: if index is less than 0 or >= supported device count.