Add Digital Input examples (#573)

* Add Digital Input examples

* renamed files and reworked

* updated to 1 read/second for cont example

Author: WayneDroid

examples/digital_in/acq_dig_port_int_clk.py

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+"""Example for reading digital signals.
+
+This example demonstrates how to input a finite digital pattern
+using the DAQ device's internal clock.
+"""
+
+import nidaqmx
+from nidaqmx.constants import AcquisitionType, LineGrouping, READ_ALL_AVAILABLE
+
+
+with nidaqmx.Task() as task:
+    task.di_channels.add_di_chan("Dev1/port0", line_grouping=LineGrouping.CHAN_FOR_ALL_LINES)
+    task.timing.cfg_samp_clk_timing(1000.0, sample_mode=AcquisitionType.FINITE, samps_per_chan=50)
+
+    data = task.read(READ_ALL_AVAILABLE)
+    print("Acquired data: [" + ", ".join(f"{value:#x}" for value in data) + "]")

examples/digital_in/cont_acq_dig_lines_int_clk.py

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+"""Example for reading digital signals.
+
+This example demonstrates how to acquire a continuous digital
+waveform using the DAQ device's internal clock.
+"""
+
+import nidaqmx
+from nidaqmx.constants import AcquisitionType, LineGrouping
+
+
+with nidaqmx.Task() as task:
+    task.di_channels.add_di_chan("Dev1/port0/line0:3", line_grouping=LineGrouping.CHAN_PER_LINE)
+    task.timing.cfg_samp_clk_timing(1000.0, sample_mode=AcquisitionType.CONTINUOUS)
+    task.start()
+    print("Acquiring samples continuously. Press Ctrl+C to stop.")
+
+    try:
+        total_read = 0
+        while True:
+            data = task.read(number_of_samples_per_channel=1000)
+            read = len(data)
+            total_read += read
+            print(f"Acquired data: {read} samples. Total {total_read}.", end="\r")
+    except KeyboardInterrupt:
+        pass
+    finally:
+        task.stop()
+        print(f"\nAcquired {total_read} total samples.")

examples/digital_in/di_sw_timed.py

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+"""Example for reading digital signals.
+
+This example demonstrates how to read values from one or more
+digital input channels.
+"""
+
+import nidaqmx
+from nidaqmx.constants import LineGrouping
+
+
+with nidaqmx.Task() as task:
+    task.di_channels.add_di_chan("Dev1/port0/line0:3", line_grouping=LineGrouping.CHAN_PER_LINE)
+
+    data = task.read()
+    print(f"Acquired data: {data}")

examples/digital_in/read_dig_lines.py

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+"""Example for reading a digital signal.
+
+This example demonstrates how to read values from a digital
+input port.
+"""
+
+import nidaqmx
+from nidaqmx.constants import LineGrouping
+
+
+with nidaqmx.Task() as task:
+    task.di_channels.add_di_chan("Dev1/port0", line_grouping=LineGrouping.CHAN_FOR_ALL_LINES)
+
+    data = task.read()
+    print(f"Acquired data: {data:#x}")