def test_find_unit_success(self):
"""test_find_unit_success
note: test assumes you have set test_helpers.drivers_with_device_connected"""
if not drivers_with_device_connected:
return
device = dut.find_unit()
try:
self.assertIsInstance(device, Device)
self.assertIn(device.driver.name, drivers_with_device_connected)
finally:
device.close()
def test_find_unit_failure(self):
devices = []
threw = False
try:
while len(devices) <= len(drivers_with_device_connected):
devices.append(dut.find_unit())
except DeviceNotFoundError:
threw = True
finally:
for device in devices:
device.close()
self.assertEqual(len(drivers_with_device_connected), len(devices))
self.assertTrue(threw)
def main():
parser = argparse.ArgumentParser()
parser.add_argument('-b', '--bits', type=float, default=8)
args = parser.parse_args()
if args.bits < 8:
raise ValueError("you need to specify bits to be at least 8.")
with find_unit() as device:
print("found PicoScope: %s" % (device.info, ))
channel_configs = [
ChannelConfig(name='A', enabled=True, coupling='DC', range_peak=5.)
]
actual_interval = 1.e-6
oversample = int(round(4**(args.bits - 8)))
print("using oversample of", oversample)
min_total_capture_time = 2.e-3
# using oversample, we can pump up the effective resolution of the scope (while reducing the total available
# sample memory).
timebase_options = TimebaseOptions(
max_time_interval=actual_interval,
no_of_samples=None,
min_collection_time=min_total_capture_time,
oversample=oversample)
times, voltages, overflow_warnings = device.capture_block(
timebase_options, channel_configs)
for channel, data in voltages.items():
label = "Channel %s" % channel
if channel in overflow_warnings:
label += " (over range)"
plt.plot(times, data, label=label)
plt.xlabel('Time / s')
plt.ylabel('Amplitude / V')
plt.legend()
plt.show()
#
# Copyright (C) 2018 Pico Technology Ltd. See LICENSE file for terms.
#
from __future__ import print_function
from picosdk.discover import find_unit
from picosdk.device import ChannelConfig, TimebaseOptions
import matplotlib.pyplot as plt
with find_unit() as device:
print("found PicoScope: %s" % (device.info, ))
channel_configs = [ChannelConfig('A', True, 'DC', 5.)]
microsecond = 1.e-6
# the entry-level scopes only have about 8k-samples of memory onboard for block mode, so only ask for 6k samples.
timebase_options = TimebaseOptions(microsecond, None, 6000 * microsecond)
times, voltages, overflow_warnings = device.capture_block(
timebase_options, channel_configs)
for channel, data in voltages.items():
label = "Channel %s" % channel
if channel in overflow_warnings:
label += " (over range)"
plt.plot(times, data, label=label)
plt.xlabel('Time / s')
plt.ylabel('Amplitude / V')
plt.legend()
plt.show()