test_stream_counter_readers_writers.py 文件源码

def test_one_sample_pulse_time(self, x_series_device, seed):
        # Reset the pseudorandom number generator with seed.
        random.seed(seed)

        high_time = random.uniform(0.0001, 0.001)
        low_time = random.uniform(0.0001, 0.001)

        # Select random counters from the device.
        counters = random.sample(self._get_device_counters(x_series_device), 2)

        with nidaqmx.Task() as write_task, nidaqmx.Task() as read_task:
            write_task.co_channels.add_co_pulse_chan_time(
                counters[0], high_time=high_time, low_time=low_time)
            write_task.timing.cfg_implicit_timing(
                sample_mode=AcquisitionType.CONTINUOUS)

            read_task.ci_channels.add_ci_pulse_chan_time(
                counters[1], min_val=0.0001, max_val=0.001)
            read_task.ci_channels.all.ci_pulse_time_term = (
                '/{0}InternalOutput'.format(counters[0]))

            read_task.start()
            write_task.start()

            reader = CounterReader(read_task.in_stream)
            value_read = reader.read_one_sample_pulse_time()
            write_task.stop()

            assert numpy.isclose(value_read.high_time, high_time, rtol=0.05)
            assert numpy.isclose(value_read.low_time, low_time, rtol=0.05)