Examples

You can download all nifgen examples for latest version here

nifgen_arb_waveform.py

(nifgen_arb_waveform.py)
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#!/usr/bin/python

import argparse
import math
import nifgen
import sys
import time


def create_waveform_data(number_of_samples):
    waveform_data = []
    angle_per_sample = (2 * math.pi) / number_of_samples
    for i in range(number_of_samples):
        waveform_data.append(math.sin(i * angle_per_sample) * math.sin(i * angle_per_sample * 20))
    return waveform_data


def example(resource_name, options, samples, gain, offset, gen_time):
    waveform_data = create_waveform_data(samples)
    with nifgen.Session(resource_name=resource_name, options=options) as session:
        session.output_mode = nifgen.OutputMode.ARB
        waveform = session.create_waveform(waveform_data_array=waveform_data)
        session.configure_arb_waveform(waveform_handle=waveform, gain=gain, offset=offset)
        with session.initiate():
            time.sleep(gen_time)


def _main(argsv):
    parser = argparse.ArgumentParser(description='Continuously generates an arbitrary waveform.', formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    parser.add_argument('-n', '--resource-name', default='PXI1Slot2', help='Resource name of an NI arbitrary waveform generator.')
    parser.add_argument('-s', '--samples', default=100000, type=int, help='Number of samples')
    parser.add_argument('-g', '--gain', default=1.0, type=float, help='Gain')
    parser.add_argument('-o', '--offset', default=0.0, type=float, help='DC offset (V)')
    parser.add_argument('-t', '--time', default=5.0, type=float, help='Generation time (s)')
    parser.add_argument('-op', '--option-string', default='', type=str, help='Option string')
    args = parser.parse_args(argsv)
    example(args.resource_name, args.option_string, args.samples, args.gain, args.offset, args.time)


def main():
    _main(sys.argv[1:])


def test_example():
    options = {'simulate': True, 'driver_setup': {'Model': '5433 (2CH)', 'BoardType': 'PXIe', }, }
    example('PXI1Slot2', options, 100000, 1.0, 0.0, 5.0)


def test_main():
    cmd_line = ['--option-string', 'Simulate=1, DriverSetup=Model:5433 (2CH);BoardType:PXIe', ]
    _main(cmd_line)


if __name__ == '__main__':
    main()

nifgen_script.py

(nifgen_script.py)
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#!/usr/bin/python

import argparse
import nifgen

import math
import sys
import time

# waveform size should be a multiple of the quantum, which is 4, 2 or 1, for all devices
# minimum waveform size needed to prevent underflow varies with sample rate and device.
# If underflow occurs, increase this value.
NUMBER_OF_SAMPLES = 2096


# waveforms finish just short of 360 degrees, so that we don't repeat the first point
# if we repeat the waveform
SINE_WAVE = [math.sin(math.pi * 2 * x / (NUMBER_OF_SAMPLES)) for x in range(NUMBER_OF_SAMPLES)]
RAMP_UP = [x / (NUMBER_OF_SAMPLES) for x in range(NUMBER_OF_SAMPLES)]
RAMP_DOWN = [-1.0 * x for x in RAMP_UP]
SQUARE_WAVE = [1.0 if x < (NUMBER_OF_SAMPLES / 2) else -1.0 for x in range(NUMBER_OF_SAMPLES)]
SAWTOOTH_WAVE = RAMP_UP[::2] + [(-1 + x) for x in RAMP_UP][::2]


SCRIPT_ALL = '''
script scriptmulti
  repeat until scriptTrigger0
    generate rampup
    generate sine
    generate rampdown
  end repeat
  repeat until scriptTrigger0
    generate rampdown
    generate square
    generate rampup
  end repeat
  repeat until scriptTrigger0
    generate rampup
    generate rampdown
  end repeat
  repeat until scriptTrigger0
    generate sine
  end repeat
  repeat until scriptTrigger0
    generate sawtooth
  end repeat
  repeat until scriptTrigger0
    generate rampdown
    generate rampup
  end repeat
end script

script scriptsine
  repeat until scriptTrigger0
    generate sine
  end repeat
end script

script scriptrampup
  repeat until scriptTrigger0
    generate rampup
  end repeat
end script

script scriptrampdown
  repeat until scriptTrigger0
    generate rampdown
  end repeat
end script

script scriptsquare
  repeat until scriptTrigger0
    generate square
  end repeat
end script

script scriptsawtooth
  repeat until scriptTrigger0
    generate sawtooth
  end repeat
end script
'''


def example(resource_name, options, shape, channel):
    with nifgen.Session(resource_name=resource_name, options=options, channel_name=channel) as session:
        # CONFIGURATION
        # 1 - Set the mode to Script
        session.output_mode = nifgen.OutputMode.SCRIPT

        # 2 - Configure Trigger:
        # SOFTWARE TRIGGER: used in the script
        session.script_triggers[0].script_trigger_type = nifgen.ScriptTriggerType.SOFTWARE_EDGE  # TRIG_NONE / DIGITAL_EDGE / DIGITAL_LEVEL / SOFTWARE_EDGE
        session.script_triggers[0].digital_edge_script_trigger_edge = nifgen.ScriptTriggerDigitalEdgeEdge.RISING  # RISING / FAILING

        # 3 - Calculate and write different waveform data to the device's onboard memory
        session.channels[channel].write_waveform('sine', SINE_WAVE)        # (waveform_name, data)
        session.channels[channel].write_waveform('rampup', RAMP_UP)
        session.channels[channel].write_waveform('rampdown', RAMP_DOWN)
        session.channels[channel].write_waveform('square', SQUARE_WAVE)
        session.channels[channel].write_waveform('sawtooth', SAWTOOTH_WAVE)

        # 4 - Script to generate
        # supported shapes: SINE / SQUARE / SAWTOOTH / RAMPUP / RAMPDOWN / MULTI
        script_name = 'script{}'.format(shape.lower())
        num_triggers = 6 if shape.upper() == 'MULTI' else 1  # Only multi needs multiple triggers, all others need one

        session.channels[channel].write_script(SCRIPT_ALL)
        session.script_to_generate = script_name

        # LAUNCH
        with session.initiate():
            for x in range(num_triggers):
                time.sleep(10)
                session.script_triggers[0].send_software_edge_trigger()


def _main(argsv):
    parser = argparse.ArgumentParser(description='Generate different shape waveforms.', formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    parser.add_argument('-n', '--resource-name', default='PXI1Slot2', help='Resource name of an NI arbitrary waveform generator.')
    parser.add_argument('-s', '--shape', default='SINE', help='Shape of the signal to generate')
    parser.add_argument('-c', '--channel', default='0', help='Channel to use when generating')
    parser.add_argument('-op', '--option-string', default='', type=str, help='Option string')
    args = parser.parse_args(argsv)
    example(args.resource_name, args.option_string, args.shape.upper(), args.channel)


def test_example():
    options = {'simulate': True, 'driver_setup': {'Model': '5433 (2CH)', 'BoardType': 'PXIe', }, }
    example('PXI1Slot2', options, 'SINE', '0')


def test_main():
    cmd_line = ['--option-string', 'Simulate=1, DriverSetup=Model:5433 (2CH);BoardType:PXIe', '--channel', '0', ]
    _main(cmd_line)


def main():
    _main(sys.argv[1:])


if __name__ == '__main__':
    main()

nifgen_standard_function.py

(nifgen_standard_function.py)
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#!/usr/bin/python

import argparse
import nifgen
import sys
import time


def example(resource_name, options, waveform, frequency, amplitude, offset, phase, gen_time):
    with nifgen.Session(resource_name=resource_name, options=options) as session:
        session.output_mode = nifgen.OutputMode.FUNC
        session.configure_standard_waveform(waveform=nifgen.Waveform[waveform], amplitude=amplitude, frequency=frequency, dc_offset=offset, start_phase=phase)
        with session.initiate():
            time.sleep(gen_time)


def _main(argsv):
    supported_waveforms = list(nifgen.Waveform.__members__.keys())[:-1]  # no support for user-defined waveforms in example
    parser = argparse.ArgumentParser(description='Generates the standard function.', formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    parser.add_argument('-n', '--resource-name', default='PXI1Slot2', help='Resource name of an NI function generator.')
    parser.add_argument('-w', '--waveform', default=supported_waveforms[0], choices=supported_waveforms, type=str.upper, help='Standard waveform')
    parser.add_argument('-f', '--frequency', default=1000, type=float, help='Frequency (Hz)')
    parser.add_argument('-a', '--amplitude', default=1.0, type=float, help='Amplitude (Vpk-pk)')
    parser.add_argument('-o', '--offset', default=0.0, type=float, help='DC offset (V)')
    parser.add_argument('-p', '--phase', default=0.0, type=float, help='Start phase (deg)')
    parser.add_argument('-t', '--time', default=5.0, type=float, help='Generation time (s)')
    parser.add_argument('-op', '--option-string', default='', type=str, help='Option string')
    args = parser.parse_args(argsv)
    example(args.resource_name, args.option_string, args.waveform, args.frequency, args.amplitude, args.offset, args.phase, args.time)


def main():
    _main(sys.argv[1:])


def test_example():
    options = {'simulate': True, 'driver_setup': {'Model': '5433 (2CH)', 'BoardType': 'PXIe', }, }
    example('PXI1Slot2', options, 'SINE', 1000, 1.0, 0.0, 0.0, 5.0)


def test_main():
    cmd_line = ['--option-string', 'Simulate=1, DriverSetup=Model:5433 (2CH);BoardType:PXIe', ]
    _main(cmd_line)


if __name__ == '__main__':
    main()

nifgen_trigger.py

(nifgen_trigger.py)
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import argparse
import nifgen
import sys
import time


def example(resource_name1, resource_name2, options, waveform, gen_time):
    with nifgen.Session(resource_name=resource_name1, options=options) as session1, nifgen.Session(resource_name=resource_name2, options=options) as session2:
        session_list = [session1, session2]
        for session in session_list:
            session.output_mode = nifgen.OutputMode.FUNC
            session.configure_standard_waveform(waveform=nifgen.Waveform[waveform], amplitude=1.0, frequency=1000, dc_offset=0.0, start_phase=0.0)
        session1.start_trigger_type = nifgen.StartTriggerType.SOFTWARE_EDGE
        session2.start_trigger_type = nifgen.StartTriggerType.DIGITAL_EDGE
        session2.digital_edge_start_trigger_edge = nifgen.StartTriggerDigitalEdgeEdge.RISING
        session2.digital_edge_start_trigger_source = '/' + resource_name1 + '/0/StartTrigger'
        with session2.initiate():
            with session1.initiate():
                session1.send_software_edge_trigger(nifgen.Trigger.START)
                time.sleep(gen_time)


def _main(argsv):
    supported_waveforms = list(nifgen.Waveform.__members__.keys())[:-1]  # no support for user-defined waveforms in example
    parser = argparse.ArgumentParser(description='Triggers one device on the start trigger of another device.', formatter_class=argparse.ArgumentDefaultsHelpFormatter)
    parser.add_argument('-n1', '--resource-name1', default='PXI1Slot2', help='Resource name of an NI function generator.')
    parser.add_argument('-n2', '--resource-name2', default='PXI1Slot3', help='Resource name of an NI function generator.')
    parser.add_argument('-w', '--waveform', default=supported_waveforms[0], choices=supported_waveforms, type=str.upper, help='Standard waveform')
    parser.add_argument('-t', '--time', default=5.0, type=float, help='Generation time (s)')
    parser.add_argument('-op', '--option-string', default='', type=str, help='Option string')
    args = parser.parse_args(argsv)
    example(args.resource_name1, args.resource_name2, args.option_string, args.waveform, args.time)


def main():
    _main(sys.argv[1:])


def test_example():
    options = {'simulate': True, 'driver_setup': {'Model': '5433 (2CH)', 'BoardType': 'PXIe', }, }
    example('PXI1Slot2', 'PXI1Slot3', options, 'SINE', 5.0)


def test_main():
    cmd_line = ['--option-string', 'Simulate=1, DriverSetup=Model:5433 (2CH);BoardType:PXIe', ]
    _main(cmd_line)


if __name__ == '__main__':
    main()