def startTask(self):
# Create NI analog tasks
self.ni_task = nicontrol.AnalogWaveformOutput("USB-6002", 0)
self.ni_task.addChannel("USB-6002", 1)
# Identify the longest period and use as the length of the buffer: NOTE: the higher frequency must be a multiple of the lowest
duration = max(1 / self.x_freq, 1 / self.y_freq)
time = np.arange(0, duration, 1 / self.sampleRate)
# Create waveforms
wave_x = self.x_offset + self.x_amp * np.sin(
2 * np.pi * self.x_freq * time)
wave_y = self.y_offset + self.y_amp * np.sin(
2 * np.pi * self.y_freq * time)
self.waveform = self.coerceToRange(np.concatenate((wave_x, wave_y)))
# Send waveform to ni card
self.ni_task.setWaveform(self.waveform,
self.sampleRate,
clock="ctr0out")
# Start task
self.ni_task.startTask()
self.running = True
def initAoTask():
# Create channels.
self.ao_task = nicontrol.AnalogWaveformOutput(analog_data[0][0], analog_data[0][1])
for i in range(len(analog_data) - 1):
self.ao_task.addChannel(analog_data[i+1][0], analog_data[i+1][1])
# Add waveform
return self.ao_task.setWaveform(waveform, frequency, clock = self.waveform_clock)
def startHardwareTimedMove(self, z_positions):
# Clean up the previous task
self.ni_task.stopTask()
self.ni_task.clearTask()
# Create hardware timed task
self.ni_task = nicontrol.AnalogWaveformOutput(self.board, self.line)
# Set waveform
voltages = z_positions * self.scale
# Convert to a list of channel values and write
self.ni_task.setWaveform(voltages, 100, clock=self.trigger_source)
# NOTE: the frequency is hardcoded to a maximum allowed value (arbitrary)
self.ni_task.startTask()
def startAoTask():
try:
# Create channels.
self.ao_task = nicontrol.AnalogWaveformOutput(analog_data[0][0], analog_data[0][1])
for i in range(len(analog_data) - 1):
self.ao_task.addChannel(analog_data[i+1][0], analog_data[i+1][1])
# Add waveform
self.ao_task.setWaveform(waveform, frequency, clock = wv_clock)
# Start task.
self.ao_task.startTask()
except nicontrol.NIException:
return True
return False