code: def resetn(self):
          
          #Regular reset will kick NRF out of DBG mode
          logging.debug("target_nrf51.reset: enable reset pin")
          self.write_memory(RESET, RESET_ENABLE)
          #reset
          logging.debug("target_nrf51.reset: trigger nRST pin")
          self.reset()
docs: reset a core. After a call to this function, the core
          is running