code: def measure_one(self, data):
          
          _unused, hexstr, ih = data
          tread, twrite = 0.0, 0.0
          if self.read:
              tread = run_readtest_N_times(intelhex.IntelHex, hexstr, self.n)[0]
          if self.write:
              twrite = run_writetest_N_times(ih.write_hex_file, self.n)[0]
          return tread, twrite
docs: Do measuring of read and write operations.
          @param  data:   3-tuple from get_test_data
          @return:        (time readhex, time writehex)