Return all values for the specified channel of the type corresponding
        to the function `f`, where `f` is either `self.series_resistance` or
        `self.series_capacitance`.

def write_all_series_channel_values(self, read_f, write_f, channel,
                                        values):
        '''
        Return all values for the specified channel of the type corresponding
        to the function `f`, where `f` is either `self.series_resistance` or
        `self.series_capacitance`.
        '''

        # Create a copy of the new values we intend to write. Otherwise, if
        # `values` is a reference to the calibration object owned by the
        # control board, it can be overwritten in the following step which will
        # prevent the update.
        #
        # See http://microfluidics.utoronto.ca/trac/dropbot/ticket/81
        values = copy.deepcopy(values)

        # Read the current values, and only update the values that are
        # different.
        original_values = self.read_all_series_channel_values(read_f, channel)

        # Make sure that the number of supplied values matches the number of
        # corresponding values read from the channel.
        assert(len(values) == len(original_values))

        for i in range(len(original_values)):
            if values[i] != original_values[i]:
                write_f(channel, values[i], i)