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nifgen_script.py
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nifgen_script.py
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#!/usr/bin/python
import argparse
import nifgen
import math
import random
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]
GAUSSIAN_NOISE = [random.gauss(0, 0.2) for x in range(NUMBER_OF_SAMPLES)]
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 noise
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
script scriptnoise
repeat until scriptTrigger0
generate noise
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)
session.channels[channel].write_waveform('noise', GAUSSIAN_NOISE)
# 4 - Script to generate
# supported shapes: SINE / SQUARE / SAWTOOTH / RAMPUP / RAMPDOWN / NOISE / 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()