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# OscilloscopeGeneratorTrigger.py - for LibTiePie 0.5+
#
# This example sets up the generator to generate a 1 kHz triangle waveform, 4 Vpp.
# It also sets up the oscilloscope to perform a block mode measurement, triggered on "Generator new period".
# A measurement is performed and the data is written to OscilloscopeGeneratorTrigger.csv.
#
# Find more information on http://www.tiepie.com/LibTiePie .
from __future__ import print_function
import time
import os
import sys
import libtiepie
from printinfo import *
# Print library info:
print_library_info()
# Search for devices:
libtiepie.device_list.update()
# Try to open an oscilloscope with block measurement support and a generator in the same device:
scp = None
gen = None
for item in libtiepie.device_list:
if (item.can_open(libtiepie.DEVICETYPE_OSCILLOSCOPE)) and (item.can_open(libtiepie.DEVICETYPE_GENERATOR)):
scp = item.open_oscilloscope()
if scp.measure_modes & libtiepie.MM_BLOCK:
gen = item.open_generator()
break
else:
scp = None
if scp and gen:
try:
# Oscilloscope settings:
# Set measure mode:
scp.measure_mode = libtiepie.MM_BLOCK
# Set sample frequency:
scp.sample_frequency = 1e6 # 1 MHz
# Set record length:
scp.record_length = 10000 # 10000 samples
# Set pre sample ratio:
scp.pre_sample_ratio = 0 # 0 %
# For all channels:
for ch in scp.channels:
# Enable channel to measure it:
ch.enabled = True
# Set range:
ch.range = 8 # 8 V
# Set coupling:
ch.coupling = libtiepie.CK_DCV # DC Volt
# Set trigger timeout:
scp.trigger_time_out = 1 # 1 s
# Disable all channel trigger sources:
for ch in scp.channels:
ch.trigger.enabled = False
# Locate trigger input:
trigger_input = scp.trigger_inputs.get_by_id(libtiepie.TIID_GENERATOR_NEW_PERIOD) # or TIID_GENERATOR_START or TIID_GENERATOR_STOP
if trigger_input is None:
raise Exception('Unknown trigger input!')
# Enable trigger input:
trigger_input.enabled = True
# Generator settings:
# Set signal type:
gen.signal_type = libtiepie.ST_TRIANGLE
# Set frequency:
gen.frequency = 1e3 # 1 kHz
# Set amplitude:
gen.amplitude = 2 # 2 V
# Set offset:
gen.offset = 0 # 0 V
# Enable output:
gen.output_on = True
# Print oscilloscope info:
print_device_info(scp)
# Print generator info:
print_device_info(gen)
# Start measurement:
scp.start()
# Start signal generation:
gen.start()
# Wait for measurement to complete:
while not scp.is_data_ready:
time.sleep(0.01) # 10 ms delay, to save CPU time
# Stop generator:
gen.stop()
# Disable output:
gen.output_on = False
# Get data:
data = scp.get_data()
# Output CSV data:
csv_file = open('OscilloscopeGeneratorTrigger.csv', 'w')
try:
csv_file.write('Sample')
for i in range(len(data)):
csv_file.write(';Ch' + str(i + 1))
csv_file.write(os.linesep)
for i in range(len(data[0])):
csv_file.write(str(i))
for j in range(len(data)):
csv_file.write(';' + str(data[j][i]))
csv_file.write(os.linesep)
print()
print('Data written to: ' + csv_file.name)
finally:
csv_file.close()
except Exception as e:
print('Exception: ' + e.message)
sys.exit(1)
# Close oscilloscope:
del scp
# Close generator:
del gen
else:
print('No oscilloscope available with block measurement support or generator available in the same unit!')
sys.exit(1)
sys.exit(0)
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