Examples¶
You can download all niscope examples here
niscope_fetch.py¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | #!/usr/bin/python import argparse import niscope import pprint import sys pp = pprint.PrettyPrinter(indent=4, width=80) def example(resource_name, channels, options, length, voltage): with niscope.Session(resource_name=resource_name, options=options) as session: session.configure_vertical(range=voltage, coupling=niscope.VerticalCoupling.AC) session.configure_horizontal_timing(min_sample_rate=50000000, min_num_pts=length, ref_position=50.0, num_records=1, enforce_realtime=True) with session.initiate(): waveforms = session.channels[channels].fetch(num_samples=length) for i in range(len(waveforms)): print('Waveform {0} information:'.format(i)) print(str(waveforms[i]) + '\n\n') def _main(argsv): parser = argparse.ArgumentParser(description='Acquires one record from the given channels.', formatter_class=argparse.ArgumentDefaultsHelpFormatter) parser.add_argument('-n', '--resource-name', default='PXI1Slot2', help='Resource name of an NI digitizer.') parser.add_argument('-c', '--channels', default='0', help='Channel(s) to use') parser.add_argument('-l', '--length', default=1000, type=int, help='Measure record length') parser.add_argument('-v', '--voltage', default=1.0, type=float, help='Voltage range (V)') parser.add_argument('-op', '--option-string', default='', type=str, help='Option string') args = parser.parse_args(argsv) example(args.resource_name, args.channels, args.option_string, args.length, args.voltage) def main(): _main(sys.argv[1:]) def test_example(): options = {'simulate': True, 'driver_setup': {'Model': '5164', 'BoardType': 'PXIe', }, } example('PXI1Slot2', '0', options, 1000, 1.0) def test_main(): cmd_line = ['--option-string', 'Simulate=1, DriverSetup=Model:5164; BoardType:PXIe', ] _main(cmd_line) if __name__ == '__main__': main() |
niscope_fetch_forever.py¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 | #!/usr/bin/python import argparse import hightime import niscope import numpy as np import pprint import sys pp = pprint.PrettyPrinter(indent=4, width=80) # We use fetch_into which allows us to allocate a single buffer per channel and "fetch into" it a section at a time without having to # reconstruct the waveform once we are done def example(resource_name, options, total_acquisition_time_in_seconds, voltage, sample_rate_in_hz, samples_per_fetch): total_samples = int(total_acquisition_time_in_seconds * sample_rate_in_hz) # 1. Opening session with niscope.Session(resource_name=resource_name, options=options) as session: # We will acquire on all channels of the device channel_list = [c for c in range(session.channel_count)] # Need an actual list and not a range # 2. Creating numpy arrays waveforms = [np.ndarray(total_samples, dtype=np.float64) for c in channel_list] # 3. Configuring session.configure_horizontal_timing(min_sample_rate=sample_rate_in_hz, min_num_pts=1, ref_position=0.0, num_records=1, enforce_realtime=True) session.channels[channel_list].configure_vertical(voltage, coupling=niscope.VerticalCoupling.DC, enabled=True) # Configure software trigger, but never send the trigger. # This starts an infinite acquisition, until you call session.abort() or session.close() session.configure_trigger_software() current_pos = 0 # 4. initiating with session.initiate(): while current_pos < total_samples: # We fetch each channel at a time so we don't have to de-interleave afterwards # We do not keep the wfm_info returned from fetch_into for channel, waveform in zip(channel_list, waveforms): # 5. fetching - we return the slice of the waveform array that we want to "fetch into" session.channels[channel].fetch_into(waveform[current_pos:current_pos + samples_per_fetch], relative_to=niscope.FetchRelativeTo.READ_POINTER, offset=0, record_number=0, num_records=1, timeout=hightime.timedelta(seconds=5.0)) current_pos += samples_per_fetch def _main(argsv): parser = argparse.ArgumentParser(description='Fetch more samples than will fit in memory.', formatter_class=argparse.ArgumentDefaultsHelpFormatter) parser.add_argument('-n', '--resource-name', default='PXI1Slot2', help='Resource name of an NI digitizer.') parser.add_argument('-t', '--time', default=10, type=int, help='Time to sample (s)') parser.add_argument('-v', '--voltage', default=1.0, type=float, help='Voltage range (V)') parser.add_argument('-op', '--option-string', default='', type=str, help='Option string') parser.add_argument('-r', '--sample-rate', default=1000.0, type=float, help='Sample Rate (Hz)') parser.add_argument('-s', '--samples-per-fetch', default=100, type=int, help='Samples per fetch') args = parser.parse_args(argsv) example(args.resource_name, args.option_string, args.time, args.voltage, args.sample_rate, args.samples_per_fetch) def main(): _main(sys.argv[1:]) def test_example(): options = {'simulate': True, 'driver_setup': {'Model': '5164', 'BoardType': 'PXIe', }, } example('PXI1Slot2', options, 10, 1.0, 1000.0, 100) def test_main(): cmd_line = ['--option-string', 'Simulate=1, DriverSetup=Model:5164; BoardType:PXIe', ] _main(cmd_line) if __name__ == '__main__': main() |
niscope_read.py¶
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | #!/usr/bin/python import argparse import niscope import pprint import sys pp = pprint.PrettyPrinter(indent=4, width=80) def example(resource_name, channels, options, length, voltage): with niscope.Session(resource_name=resource_name, options=options) as session: session.configure_vertical(range=voltage, coupling=niscope.VerticalCoupling.AC) session.configure_horizontal_timing(min_sample_rate=50000000, min_num_pts=length, ref_position=50.0, num_records=1, enforce_realtime=True) waveforms = session.channels[channels].read(num_samples=length) for i in range(len(waveforms)): print('Waveform {0} information:'.format(i)) print(str(waveforms[i]) + '\n\n') def _main(argsv): parser = argparse.ArgumentParser(description='Acquires one record from the given channels.', formatter_class=argparse.ArgumentDefaultsHelpFormatter) parser.add_argument('-n', '--resource-name', default='PXI1Slot2', help='Resource name of an NI digitizer.') parser.add_argument('-c', '--channels', default='0', help='Channel(s) to use') parser.add_argument('-l', '--length', default=1000, type=int, help='Measure record length') parser.add_argument('-v', '--voltage', default=1.0, type=float, help='Voltage range (V)') parser.add_argument('-op', '--option-string', default='', type=str, help='Option string') args = parser.parse_args(argsv) example(args.resource_name, args.channels, args.option_string, args.length, args.voltage) def main(): _main(sys.argv[1:]) def test_example(): options = {'simulate': True, 'driver_setup': {'Model': '5164', 'BoardType': 'PXIe', }, } example('PXI1Slot2', '0', options, 1000, 1.0) def test_main(): cmd_line = ['--option-string', 'Simulate=1, DriverSetup=Model:5164; BoardType:PXIe', ] _main(cmd_line) if __name__ == '__main__': main() |