Add DO examples (#575)

* Add DO examples

* fixed style errors

* renamed files and reworked

* removed comments

* removed spinwait

* call task start explicitly

examples/digital_out/cont_gen_dig_port_int_clk.py

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+"""Example for generating digital signals.
+
+This example demonstrates how to output a continuous digital
+pattern using the DAQ device's clock.
+"""
+
+import nidaqmx
+from nidaqmx.constants import AcquisitionType, LineGrouping
+
+with nidaqmx.Task() as task:
+    data = [1, 2, 4, 8, 16, 32, 64, 128]
+
+    task.do_channels.add_do_chan("Dev1/port0", line_grouping=LineGrouping.CHAN_FOR_ALL_LINES)
+    task.timing.cfg_samp_clk_timing(1000.0, sample_mode=AcquisitionType.CONTINUOUS)
+    task.write(data)
+    task.start()
+
+    input("Generating voltage continuously. Press Enter to stop.\n")
+
+    task.stop()

examples/digital_out/gen_dig_line_int_clk.py

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+"""Example for generating digital signals.
+
+This example demonstrates how to output a finite digital
+waveform using the DAQ device's internal clock.
+"""
+
+import nidaqmx
+from nidaqmx.constants import AcquisitionType, LineGrouping
+
+with nidaqmx.Task() as task:
+    data: bool = [bool(i % 2) for i in range(1000)]
+
+    task.do_channels.add_do_chan("Dev1/port0/line0", line_grouping=LineGrouping.CHAN_PER_LINE)
+    task.timing.cfg_samp_clk_timing(
+        1000.0, sample_mode=AcquisitionType.FINITE, samps_per_chan=len(data)
+    )
+
+    number_of_samples_written = task.write(data)
+    task.start()
+    print(f"Generating {number_of_samples_written} voltage samples.")
+    task.wait_until_done()
+    task.stop()

examples/digital_out/write_dig_lines.py

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+"""Example for generating digital signals.
+
+This example demonstrates how to write values to a digital
+output channel.
+"""
+
+import nidaqmx
+from nidaqmx.constants import LineGrouping
+
+with nidaqmx.Task() as task:
+    data = [True, False, True, False]
+
+    task.do_channels.add_do_chan("Dev1/port0/line0:3", line_grouping=LineGrouping.CHAN_PER_LINE)
+    task.start()
+    task.write(data)
+    task.stop()

examples/digital_out/write_dig_port.py

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+"""Example for generating digital signals.
+
+This example demonstrates how to write values to a digital
+output port.
+"""
+
+import nidaqmx
+from nidaqmx.constants import LineGrouping
+
+with nidaqmx.Task() as task:
+    data = 0xFFFFFFFF
+
+    task.do_channels.add_do_chan("Dev1/port0", line_grouping=LineGrouping.CHAN_FOR_ALL_LINES)
+    task.start()
+    task.write(data)
+    task.stop()