def stream(low_channel, high_channel, sample_rate, data_file):
"""Analog input scan example."""
daq_device = None
ai_device = None
status = ScanStatus.IDLE
device_number = 0
dt = 0.1 # how often save a chunk of data
range_index = 0
buffer_margin = 20
interface_type = InterfaceType.ANY
samples_per_channel = int(buffer_margin * dt * sample_rate)
scan_options = ScanOption.CONTINUOUS
flags = AInScanFlag.DEFAULT
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise RuntimeError('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
print('using device', device_number)
descriptor_index = device_number
if descriptor_index not in range(number_of_devices):
raise RuntimeError('Error: Invalid descriptor index')
# Create the DAQ device from the descriptor at the specified index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the AiDevice object and verify that it is valid.
ai_device = daq_device.get_ai_device()
if ai_device is None:
raise RuntimeError('Error: The DAQ device does not support analog '
'input')
# Verify the specified device supports hardware pacing for analog input.
ai_info = ai_device.get_info()
if not ai_info.has_pacer():
raise RuntimeError('\nError: The specified DAQ device does not '
'support hardware paced analog input')
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
# For Ethernet devices using a connection_code other than the default
# value of zero, change the line below to enter the desired code.
try:
daq_device.connect(connection_code=0)
except TypeError:
daq_device.connect()
# The default input mode is SINGLE_ENDED.
input_mode = AiInputMode.SINGLE_ENDED
# If SINGLE_ENDED input mode is not supported, set to DIFFERENTIAL.
if ai_info.get_num_chans_by_mode(AiInputMode.SINGLE_ENDED) <= 0:
input_mode = AiInputMode.DIFFERENTIAL
# Get the number of channels and validate the high channel number.
number_of_channels = ai_info.get_num_chans_by_mode(input_mode)
if high_channel >= number_of_channels:
high_channel = number_of_channels - 1
channel_count = high_channel - low_channel + 1
# Get a list of supported ranges and validate the range index.
ranges = ai_info.get_ranges(input_mode)
if range_index >= len(ranges):
range_index = len(ranges) - 1
# Allocate a buffer to receive the data.0
data = create_float_buffer(channel_count, samples_per_channel)
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstsample_rated: ai_device.a_in_scan()')
print(' Channels: ', low_channel, '-', high_channel)
print(' Input mode: ', input_mode.name)
print(' Range: ', ranges[range_index].name)
print(' Samples per channel: ', samples_per_channel)
print(' Rate: ', sample_rate, 'Hz')
print(' Scan options:', display_scan_options(scan_options))
# Start the acquisition.
sample_rate = ai_device.a_in_scan(low_channel, high_channel,
input_mode, ranges[range_index],
samples_per_channel, sample_rate,
scan_options, flags, data)
print()
print('acquiring data ..', end='')
stdout.flush()
with open(data_file, 'w') as f:
save_count = 0
last_save_index = 0
buffer_size = samples_per_channel * channel_count
while not done:
# Get the status of the background operation
status, transfer_status = ai_device.get_scan_status()
current_index = transfer_status.current_index
if current_index < 0:
continue
num_to_save = (current_index -
last_save_index) % buffer_size + channel_count
# Write data to file
for i in range(num_to_save):
if i % channel_count == 0:
f.write('{} '.format(save_count))
save_count += 1
save_index = (last_save_index + i) % buffer_size
f.write('{}'.format(data[save_index]))
if i % channel_count == (channel_count - 1):
f.write('\n')
else:
f.write(' ')
last_save_index = (current_index + channel_count) % buffer_size
sleep(dt)
print('done')
except RuntimeError as error:
print('\n', error)
finally:
if daq_device:
# Stop the acquisition if it is still running.
if status == ScanStatus.RUNNING:
ai_device.scan_stop()
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
async def run(self, parsed_args, output):
aq_device = None
ctr_device = None
descriptor_index = 0
interface_type = InterfaceType.USB
low_encoder = 0
encoder_count = 5
sample_rate = 1000.0 # 1000 # Hz
samples_per_channel = 10000 # 10000
scan_options = ScanOption.CONTINUOUS
scan_flags = CInScanFlag.DEFAULT
encoder_type = CounterMeasurementType.ENCODER
encoder_mode = CounterMeasurementMode.ENCODER_X4
edge_detection = CounterEdgeDetection.RISING_EDGE
tick_size = CounterTickSize.TICK_20ns
debounce_mode = CounterDebounceMode.TRIGGER_AFTER_STABLE
debounce_time = CounterDebounceTime.DEBOUNCE_7500ns
config_flags = CConfigScanFlag.DEFAULT
daq_device = None
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise ValueError('Error: No DAQ devices found')
# Create the DAQ device object associated with the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the CtrDevice object and verify that it is valid.
ctr_device = daq_device.get_ctr_device()
if ctr_device is None:
raise ValueError(
'Error: The DAQ device does not support counters')
# Verify that the specified device supports hardware pacing for counters.
ctr_info = ctr_device.get_info()
if not ctr_info.has_pacer():
raise ValueError(
'Error: The specified DAQ device does not support hardware paced counter input'
)
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
daq_device.connect()
# Get the encoder counter channels.
encoder_counters = get_supported_encoder_counters(ctr_info)
if len(encoder_counters) == 0:
raise ValueError(
'Error: The specified DAQ device does not support encoder channels'
)
# Verify that the low_encoder number is valid.
first_encoder = encoder_counters[0]
if low_encoder < first_encoder:
low_encoder = first_encoder
if low_encoder > first_encoder + len(encoder_counters) - 1:
low_encoder = first_encoder
# Verify that the encoder count is valid.
if encoder_count > len(encoder_counters):
encoder_count = len(encoder_counters)
# Set the high_encoder channel.
high_encoder = low_encoder + encoder_count - 1
if high_encoder > first_encoder + len(encoder_counters) - 1:
high_encoder = first_encoder + len(encoder_counters) - 1
# update the actual number of encoders being used
encoder_count = high_encoder - low_encoder + 1
# Clear the counter, and configure the counter as an encoder.
for encoder in range(low_encoder, high_encoder + 1):
ctr_device.c_config_scan(encoder, encoder_type, encoder_mode,
edge_detection, tick_size,
debounce_mode, debounce_time,
config_flags)
# Allocate a buffer to receive the data.
data = create_int_buffer(encoder_count, samples_per_channel)
# Start the scan
ctr_device.c_in_scan(low_encoder, high_encoder,
samples_per_channel, sample_rate,
scan_options, scan_flags, data)
# prev_samples_per_channel = 0
# cur_samples_per_channel = 0
prev_index = 0
XVect = []
YVect = []
ZVect = []
EVect = []
AllVect = []
startX = 0.0
startY = 0.0
startZ = 0.0
startE = 0.0
# newZ = []
prev_index = 0
start_time = time_now()
cur_time = start_time + 1
while not self.stop_requested:
status, transfer_status = ctr_device.get_scan_status()
# not sure if can await the above line
index = transfer_status.current_index
# print(index)
# edge starting condition
if index == -1:
AllVect = [0.0, 0.0, 0.0, 0.0, 0.0]
# normal condition
else:
# has not looped around
if prev_index < index:
AllVect = data[prev_index:index]
# has wrapped around
else:
AllVect = data[prev_index:] + data[0:index]
prev_index = index
# print(AllVect)
XVect = AllVect[3::5]
YVect = AllVect[1::5]
Z1Vect = AllVect[0::5]
Z2Vect = AllVect[2::5]
EVect = AllVect[4::5]
end_time = cur_time + (len(XVect) -
1) * 1e3 # cur_time is in us
[XVect, startX] = processX(XVect, startX)
[YVect, startY] = processY(YVect, startY)
[EVect, startE] = processE(EVect, startE)
[ZVect, startZ] = processZ(Z1Vect, Z2Vect, startZ, cur_time,
end_time)
Xarray = np.array(XVect)
Yarray = np.array(YVect)
Zarray = np.array(ZVect)
Earray = np.array(EVect) * -1 #invert for positive extrusion
Xarray = np.vstack(Xarray)
Yarray = np.vstack(Yarray)
Zarray = np.vstack(Zarray)
Earray = np.vstack(Earray)
time_array = np.linspace(cur_time, end_time, len(XVect))
time_array = np.vstack(time_array)
# print("before all output")
All_Output = np.hstack(
(time_array, Xarray, Yarray, Zarray, Earray))
# print("after all output")
# print(All_Output)
await output.write(np.array(All_Output))
# print("after writing")
# print(len(YVect))
# for i in range(len(YVect)):
# print(str(YVect[i])+ "\t"+str(newY[i]))
await asyncio.sleep(1)
cur_time = end_time + 1e3
if status != ScanStatus.RUNNING:
break
# except (ValueError, NameError, SyntaxError):
# break
# print("next while loop cycle")
except ValueError as e:
print(str(e))
except Exception as e:
raise e
finally:
if daq_device:
if ctr_device:
ctr_device.scan_stop()
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
def main():
daq_device = None
interface_type = InterfaceType.USB
descriptor_index = 0
port_types_index = 0
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create the DAQ device object associated with the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the DioDevice object and verify that it is valid.
dio_device = daq_device.get_dio_device()
if dio_device is None:
raise Exception(
'Error: The DAQ device does not support digital input')
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
# Get the port types for the device(AUXPORT, FIRSTPORTA, ...)
dio_info = dio_device.get_info()
port_types = dio_info.get_port_types()
if port_types_index >= len(port_types):
port_types_index = len(port_types) - 1
port_to_read = port_types[port_types_index]
# Configure the port for input.
port_info = dio_info.get_port_info(port_to_read)
if (port_info.port_io_type == DigitalPortIoType.IO
or port_info.port_io_type == DigitalPortIoType.BITIO):
dio_device.d_config_port(port_to_read, DigitalDirection.INPUT)
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstrated: dio_device.d_in()')
print(' Port: ', port_to_read.name)
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
system('clear')
try:
while True:
try:
reset_cursor()
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
# Read the first port.
data = dio_device.d_in(port_to_read)
clear_eol()
print('Port(', port_to_read.name, ') Data: ', data)
sleep(0.1)
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
def main():
daq_device = None
dio_device = None
port_to_write = None
port_info = None
interface_type = InterfaceType.USB
descriptor_index = 0
port_types_index = 0
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create the DAQ device object associated with the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the DioDevice object and verify that it is valid.
dio_device = daq_device.get_dio_device()
if dio_device is None:
raise Exception(
'Error: The device does not support digital output')
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
# Get the port types for the device(AUXPORT, FIRSTPORTA, ...)
dio_info = dio_device.get_info()
port_types = dio_info.get_port_types()
if port_types_index >= len(port_types):
port_types_index = len(port_types) - 1
port_to_write = port_types[port_types_index]
# Get the port I/O type and the number of bits for the first port.
port_info = dio_info.get_port_info(port_to_write)
# Configure the port for output.
if (port_info.port_io_type == DigitalPortIoType.IO
or port_info.port_io_type == DigitalPortIoType.BITIO):
dio_device.d_config_port(port_to_write, DigitalDirection.OUTPUT)
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstrated: dio_device.d_out()')
print(' Port: ', port_types[port_types_index].name)
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
system('clear')
max_port_value = int(pow(2.0, port_info.number_of_bits) - 1)
reset_cursor()
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
try:
while True:
try:
data = input('Enter a value between 0 and ' +
'{:.0f}'.format(max_port_value) +
' (or non-numeric character to exit): ')
# write the first port
dio_device.d_out(port_to_write, int(data))
sleep(0.1)
cursor_up()
clear_eol()
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
if dio_device and port_to_write and port_info:
# before disconnecting, set the port back to input
if (port_info.port_io_type == DigitalPortIoType.IO
or port_info.port_io_type == DigitalPortIoType.BITIO):
dio_device.d_config_port(port_to_write,
DigitalDirection.INPUT)
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
def main():
# Parameters for AoDevice.a_out_scan
low_channel = 0
high_channel = 0
voltage_range_index = 0 # Use the first supported range
samples_per_channel = 2000 # Two second buffer (sample_rate * 2)
sample_rate = 1000 # Hz
scan_options = ScanOption.CONTINUOUS
scan_flags = AOutScanFlag.DEFAULT
interface_type = InterfaceType.USB
daq_device = None
ao_device = None
scan_status = ScanStatus.IDLE
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
# Verify at least one DAQ device is detected.
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create a DaqDevice object from the first descriptor.
daq_device = DaqDevice(devices[0])
ao_device = daq_device.get_ao_device()
# Verify the specified DAQ device supports analog output.
if ao_device is None:
raise Exception(
'Error: The DAQ device does not support analog output')
# Verify the specified DAQ device supports hardware pacing for analog output.
ao_info = ao_device.get_info()
if not ao_info.has_pacer():
raise Exception(
'Error: The DAQ device does not support paced analog output')
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
# Establish a connection to the device.
daq_device.connect()
chan_string = str(low_channel)
num_channels = high_channel - low_channel + 1
if num_channels > 1:
chan_string = ' '.join((chan_string, '-', str(high_channel)))
# Select the voltage range
voltage_ranges = ao_info.get_ranges()
if voltage_range_index < 0:
voltage_range_index = 0
elif voltage_range_index >= len(voltage_ranges):
voltage_range_index = len(voltage_ranges) - 1
voltage_range = ao_info.get_ranges()[voltage_range_index]
# Create a buffer for output data.
out_buffer = create_float_buffer(num_channels, samples_per_channel)
# Fill the output buffer with data.
amplitude = 1.0 # Volts
offset = amplitude if voltage_range > 1000 else 0.0 # Set an offset if the range is unipolar
samples_per_cycle = int(sample_rate / 10.0) # 10 Hz sine wave
create_output_data(num_channels, samples_per_channel,
samples_per_cycle, amplitude, offset, out_buffer)
print('\n', descriptor.dev_string, 'ready')
print(' Function demonstrated: AoDevice.a_out_scan')
print(' Channel(s):', chan_string)
print(' Range:', voltage_range.name)
print(' Samples per channel:', samples_per_channel)
print(' Sample Rate:', sample_rate, 'Hz')
print(' Scan options:', display_scan_options(scan_options))
try:
input('\nHit ENTER to continue')
except (NameError, SyntaxError):
pass
# Start the output scan.
sample_rate = ao_device.a_out_scan(low_channel, high_channel,
voltage_range, samples_per_channel,
sample_rate, scan_options,
scan_flags, out_buffer)
system('clear')
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
print(' Actual scan rate: ', sample_rate, 'Hz')
try:
while True:
# Get and display the scan status.
scan_status, transfer_status = ao_device.get_scan_status()
if scan_status != ScanStatus.RUNNING:
break
print(' Current scan count: ',
transfer_status.current_scan_count)
print(' Current total count:',
transfer_status.current_total_count)
print(' Current index: ',
transfer_status.current_index)
stdout.flush()
sleep(0.1)
# Clear the previous status before displaying the next status.
for line in range(3):
stdout.write(CURSOR_UP + ERASE_LINE)
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Stop the scan.
if scan_status == ScanStatus.RUNNING:
ao_device.scan_stop()
# Disconnect from the DAQ device.
if daq_device.is_connected():
daq_device.disconnect()
# Release the DAQ device resource.
daq_device.release()
def main():
# Parameters for DaqoDevice.daq_out_scan
channel_descriptors = []
samples_per_channel = 2000 # Two second buffer (sample_rate * 2)
sample_rate = 1000 # Hz
scan_options = ScanOption.CONTINUOUS
scan_flags = DaqOutScanFlag.DEFAULT
# Parameters used when creating channel_descriptors list
analog_low_channel = 0
analog_high_channel = 0
analog_range_index = 0
digital_low_port_index = 0
digital_high_port_index = 0
interface_type = InterfaceType.USB
daq_device = None
daqo_device = None
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
# Verify at least one DAQ device is detected.
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create a DaqDevice object from the first descriptor.
daq_device = DaqDevice(devices[0])
daqo_device = daq_device.get_daqo_device()
# Verify the specified DAQ device supports DAQ output.
if daqo_device is None:
raise Exception(
'Error: The DAQ device does not support DAQ output')
daqo_info = daqo_device.get_info()
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
# Establish a connection to the device.
daq_device.connect()
# Configure supported analog input and digital input channels
amplitudes = []
samples_per_cycle = int(sample_rate / 10.0) # 10 Hz sine wave
supported_channel_types = daqo_info.get_channel_types()
if DaqOutChanType.ANALOG in supported_channel_types:
configure_analog_channels(daq_device, analog_low_channel,
analog_high_channel, analog_range_index,
channel_descriptors, amplitudes)
if DaqOutChanType.DIGITAL in supported_channel_types:
configure_digital_channels(daq_device, digital_low_port_index,
digital_high_port_index,
channel_descriptors, amplitudes)
num_channels = len(channel_descriptors)
# Create a buffer for output data.
out_buffer = create_float_buffer(num_channels, samples_per_channel)
# Fill the output buffer with data.
create_output_data(channel_descriptors, samples_per_channel,
samples_per_cycle, amplitudes, out_buffer)
print('\n', descriptor.dev_string, 'ready')
print(' Function demonstrated: DaqoDevice.daq_out_scan')
print(' Number of Scan Channels:', num_channels)
for chan in range(num_channels):
chan_descriptor = channel_descriptors[
chan] # type: DaqOutChanDescriptor
print(' Scan Channel', chan, end='')
print(': type =',
DaqOutChanType(chan_descriptor.type).name,
end='')
if chan_descriptor.type == DaqOutChanType.ANALOG:
print(', channel =', chan_descriptor.channel, end='')
print(', range =', Range(chan_descriptor.range).name, end='')
else:
print(', port =',
DigitalPortType(chan_descriptor.channel).name,
end='')
print('')
print(' Samples per channel:', samples_per_channel)
print(' Rate:', sample_rate, 'Hz')
print(' Scan options:', display_scan_options(scan_options))
try:
input('\nHit ENTER to continue')
except (NameError, SyntaxError):
pass
system('clear')
# Start the output scan.
sample_rate = daqo_device.daq_out_scan(channel_descriptors,
samples_per_channel,
sample_rate, scan_options,
scan_flags, out_buffer)
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
print(' Actual scan rate: ', sample_rate, 'Hz')
try:
while True:
# Get and display the scan status.
scan_status, transfer_status = daqo_device.get_scan_status()
if scan_status != ScanStatus.RUNNING:
break
print(' Current scan count: ',
transfer_status.current_scan_count)
print(' Current total count:',
transfer_status.current_total_count)
print(' Current index: ',
transfer_status.current_index)
stdout.flush()
sleep(0.1)
# Clear the previous status before displaying the next status.
for line in range(3):
stdout.write(CURSOR_UP + ERASE_LINE)
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Stop the scan.
if daqo_device:
daqo_device.scan_stop()
# before disconnecting, set digital ports back to input
dio_device = daq_device.get_dio_device()
for chan in channel_descriptors:
if chan.type == DaqOutChanType.DIGITAL:
dio_device.d_config_port(chan.channel,
DigitalDirection.INPUT)
# Disconnect from the DAQ device.
if daq_device.is_connected():
daq_device.disconnect()
# Release the DAQ device resource.
daq_device.release()
def main():
global rate
daq_device = None
ai_device = None
ai_info = None
descriptor_index = 0
range_index = 0
interface_type = InterfaceType.USB
low_channel = 0
high_channel = 3
samples_per_channel = 10000
rate = 100
flags = AInScanFlag.DEFAULT
event_types = (DaqEventType.ON_DATA_AVAILABLE
| DaqEventType.ON_END_OF_INPUT_SCAN
| DaqEventType.ON_INPUT_SCAN_ERROR)
ScanParams = namedtuple('ScanParams',
'buffer high_chan low_chan descriptor status')
# set the scan options for a FINITE scan ... to set the scan options for
# a continuous scan, uncomment the line that or's the SO_CONTINUOUS option
# into to the scanOptions variable
scan_options = ScanOption.DEFAULTIO
# scan_options |= ScanOption.CONTINUOUS
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create the DAQ device object from the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the AiDevice object and verify that it is valid.
ai_device = daq_device.get_ai_device()
if ai_device is None:
raise Exception('Error: The DAQ device does not support analog '
'input')
# Verify the device supports hardware pacing for analog input.
ai_info = ai_device.get_info()
if not ai_info.has_pacer():
raise Exception(
'\nError: The specified DAQ device does not support'
' hardware paced analog input')
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
# The default input mode is SINGLE_ENDED.
input_mode = AiInputMode.SINGLE_ENDED
# If SINGLE_ENDED input mode is not supported, set to DIFFERENTIAL.
if ai_info.get_num_chans_by_mode(AiInputMode.SINGLE_ENDED) <= 0:
input_mode = AiInputMode.DIFFERENTIAL
# Get the number of channels and validate the high channel number.
number_of_channels = ai_info.get_num_chans_by_mode(input_mode)
if high_channel >= number_of_channels:
high_channel = number_of_channels - 1
channel_count = high_channel - low_channel + 1
# Get a list of supported ranges and validate the range index.
ranges = ai_info.get_ranges(input_mode)
if range_index >= len(ranges):
range_index = len(ranges) - 1
# Allocate a buffer to receive the data.
data = create_float_buffer(channel_count, samples_per_channel)
# Store the user data for use in the callback function.
scan_status = {'complete': False, 'error': False}
user_data = ScanParams(data, high_channel, low_channel, descriptor,
scan_status)
# Enable the event to be notified every time 100 samples are available.
available_sample_count = 100
daq_device.enable_event(event_types, available_sample_count,
event_callback_function, user_data)
print('\n', descriptor.dev_string, 'ready', sep='')
print(' Function demonstrated: daq_device.enable_event()')
print(' Channels: ', low_channel, '-', high_channel)
print(' Input mode: ', input_mode.name)
print(' Range: ', ranges[range_index].name)
print(' Samples per channel: ', samples_per_channel)
print(' Rate: ', rate, 'Hz')
print(' Scan options:', display_scan_options(scan_options))
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
system('clear')
# Start the finite acquisition.
rate = ai_device.a_in_scan(low_channel, high_channel, input_mode,
ranges[range_index], samples_per_channel,
rate, scan_options, flags, data)
# Wait here until the scan is done ... events will be handled in the
# event handler (eventCallbackFunction).
# The scan_status values are set in the event handler callback.
while not scan_status['complete'] and not scan_status['error']:
sleep(0.1)
except KeyboardInterrupt:
pass
except (ValueError, NameError, SyntaxError):
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
if daq_device.is_connected():
# Stop the acquisition if it is still running.
if ai_device and ai_info and ai_info.has_pacer():
ai_device.scan_stop()
daq_device.disable_event(event_types)
daq_device.disconnect()
daq_device.release()
def main():
daq_device = None
daqi_device = None
status = ScanStatus.IDLE
samples_per_channel = 10000
rate = 1000.0
options = ScanOption.DEFAULTIO | ScanOption.CONTINUOUS
flags = DaqInScanFlag.DEFAULT
interface_type = InterfaceType.USB
descriptor_index = 0
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create the DAQ device object associated with the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the DaqiDevice object and verify that it is valid.
daqi_device = daq_device.get_daqi_device()
if daqi_device is None:
raise Exception(
'Error: The device does not support daq input subsystem')
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
# Get the channel types supported by the DAQI subsystem
daqi_info = daqi_device.get_info()
chan_types_list = daqi_info.get_channel_types()
# Configure the analog input channels.
channel_descriptors = []
if DaqInChanType.ANALOG_SE in chan_types_list:
configure_analog_input_channels(daq_device, channel_descriptors)
# Configure the digital input channels.
if DaqInChanType.DIGITAL in chan_types_list:
configure_digital_input_channels(daq_device, channel_descriptors)
# Configure the counter input channels.
if DaqInChanType.CTR32 in chan_types_list:
configure_counter_input_channels(daq_device, channel_descriptors)
number_of_scan_channels = len(channel_descriptors)
# Allocate a buffer to receive the data
data = create_float_buffer(number_of_scan_channels,
samples_per_channel)
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstrated: daqi_device.daq_in_scan()')
print(' Number of scan channels: ', number_of_scan_channels)
for i in range(number_of_scan_channels):
if channel_descriptors[i].type == AiInputMode.SINGLE_ENDED or \
channel_descriptors[i].type == AiInputMode.DIFFERENTIAL:
print(' ScanChannel ', i, ': type = ',
DaqInChanType(channel_descriptors[i].type).name,
', channel = ', channel_descriptors[i].channel,
', range = ',
Range(channel_descriptors[i].range).name)
else:
print(' ScanChannel ', i, ': type = ',
DaqInChanType(channel_descriptors[i].type).name,
', channel = ', channel_descriptors[i].channel)
print(' Samples per channel: ', samples_per_channel)
print(' Rate: ', rate, ' Hz')
print(' Scan options:', display_scan_options(options))
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
system('clear')
# Start the acquisition.
rate = daqi_device.daq_in_scan(channel_descriptors,
samples_per_channel, rate, options,
flags, data)
try:
while True:
try:
# Get the status of the background operation
status, transfer_status = daqi_device.get_scan_status()
reset_cursor()
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
print('actual scan rate = ', '{:.6f}'.format(rate), 'Hz\n')
index = transfer_status.current_index
print('currentScanCount = ',
transfer_status.current_scan_count)
print('currentTotalCount = ',
transfer_status.current_total_count)
print('currentIndex = ', index, '\n')
for i in range(number_of_scan_channels):
if channel_descriptors[i].type == DaqInChanType.ANALOG_SE \
or channel_descriptors[i].type == DaqInChanType.ANALOG_DIFF:
clear_eol()
print('(Ai', channel_descriptors[i].channel, '): ',
'{:.6f}'.format(data[index + i]))
elif channel_descriptors[
i].type == DaqInChanType.DIGITAL:
clear_eol()
print('(Di', channel_descriptors[i].channel, '): ',
'{:d}'.format(int(data[index + i])))
else:
clear_eol()
print('(Ci', channel_descriptors[i].channel, '): ',
'{:d}'.format(int(data[index + i])))
sleep(0.1)
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Stop the scan if it is still running.
if status == ScanStatus.RUNNING:
daqi_device.scan_stop()
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
def main():
counter_number = 0
interface_type = InterfaceType.USB
daq_device = None
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
# Verify at least one DAQ device is detected.
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create a DaqDevice object from the first descriptor.
daq_device = DaqDevice(devices[0])
ctr_device = daq_device.get_ctr_device()
# Verify the specified DAQ device supports counters.
if ctr_device is None:
raise Exception('Error: The DAQ device does not support counters')
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
# Establish a connection to the device.
daq_device.connect()
ctr_info = ctr_device.get_info()
dev_num_counters = ctr_info.get_num_ctrs()
if counter_number >= dev_num_counters:
counter_number = dev_num_counters - 1
print('\n', descriptor.dev_string, 'ready')
print(' Function demonstrated: CtrDevice.c_in')
print(' Counter:', counter_number)
try:
input('\nHit ENTER to continue')
except (NameError, SyntaxError):
pass
system('clear')
ctr_device.c_clear(counter_number)
try:
while True:
try:
# Read and display the data.
counter_value = ctr_device.c_in(counter_number)
reset_cursor()
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
print(' Counter ',
counter_number,
':',
str(counter_value).rjust(12),
sep='')
stdout.flush()
sleep(0.1)
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Disconnect from the DAQ device.
if daq_device.is_connected():
daq_device.disconnect()
# Release the DAQ device resource.
daq_device.release()
def main():
daq_device = None
dio_device = None
status = ScanStatus.IDLE
samples_per_channel = 10000
rate = 1000
scan_options = ScanOption.CONTINUOUS
flags = DInScanFlag.DEFAULT
interface_type = InterfaceType.USB
descriptor_index = 0
port_types_index = 0
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create the DAQ device object associated with the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the DioDevice object and verify that it is valid.
dio_device = daq_device.get_dio_device()
if dio_device is None:
raise Exception(
'Error: The DAQ device does not support digital input')
# Verify that the specified device supports hardware pacing for digital input.
dio_info = dio_device.get_info()
if not dio_info.has_pacer(DigitalDirection.INPUT):
raise Exception(
'Error: The specified DAQ device does not support hardware paced digital input'
)
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
# Get the port types for the device(AUXPORT, FIRSTPORTA, ...)
port_types = dio_info.get_port_types()
if port_types_index >= len(port_types):
port_types_index = len(port_types) - 1
port_to_read = port_types[port_types_index]
# Configure the port for input.
port_info = dio_info.get_port_info(port_to_read)
if (port_info.port_io_type == DigitalPortIoType.IO
or port_info.port_io_type == DigitalPortIoType.BITIO):
dio_device.d_config_port(port_to_read, DigitalDirection.INPUT)
low_port = port_to_read
hi_port = port_to_read
number_of_ports = hi_port - low_port + 1
# Allocate a buffer to receive the data.
data = create_int_buffer(number_of_ports, samples_per_channel)
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstrated: dio_device.d_in_scan()')
print(' Device name: ', descriptor.dev_string)
print(' Port: ', low_port.name)
print(' Samples per channel: ', samples_per_channel)
print(' Rate: ', rate, ' Hz')
print(' Scan options:', display_scan_options(scan_options))
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
system("clear")
# Start the acquisition.
dio_device.d_in_scan(low_port, hi_port, samples_per_channel, rate,
scan_options, flags, data)
try:
while True:
try:
status, transfer_status = dio_device.d_in_get_scan_status()
reset_cursor()
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
print('actual scan rate = ', '{:.6f}'.format(rate), 'Hz\n')
index = transfer_status.current_index
print('currentTotalCount = ',
transfer_status.current_total_count)
print('currentScanCount = ',
transfer_status.current_scan_count)
print('currentIndex = ', index, '\n')
for i in range(number_of_ports):
clear_eol()
print('port =', port_types[i].name, ': ',
'{:d}'.format(data[index + i]))
sleep(0.1)
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Stop the acquisition if it is still running.
if status == ScanStatus.RUNNING:
dio_device.d_in_scan_stop()
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
def main():
daq_device = None
descriptor_index = 0
interface_type = InterfaceType.USB
low_channel = 0
high_channel = 3
scale = TempScale.CELSIUS
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create the DAQ device object for the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the AiDevice object and verify that it is valid.
ai_device = daq_device.get_ai_device()
if ai_device is None:
raise Exception(
'Error: The DAQ device does not support analog input')
# Verify that the DAQ device has temperature channels.
ai_info = ai_device.get_info()
chan_types = ai_info.get_chan_types()
if (AiChanType.TC not in chan_types
and AiChanType.RTD not in chan_types
and AiChanType.SEMICONDUCTOR not in chan_types
and AiChanType.THERMISTOR not in chan_types):
raise Exception(
'Error: The DAQ device does not support temperature channels')
# Verify the DAQ device has the specified number of channels
number_of_channels = ai_info.get_num_chans()
if high_channel >= number_of_channels:
high_channel = number_of_channels - 1
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstrated: ai_device.t_in()')
print(' Channels: ', low_channel, '-', high_channel)
# Display channel configuration information.
ai_config = ai_device.get_config()
for chan in range(low_channel, high_channel + 1):
# Set the specified analog channels to TC type if the specified
# DAQ device is a USB-2408 or USB-2416 device
if (descriptor.product_id == USB_2416_ID
or descriptor.product_id == USB_2416_4AO_ID
or descriptor.product_id == USB_2408_ID
or descriptor.product_id == USB_2408_2AO_ID):
ai_config.set_chan_type(chan, AiChanType.TC)
chan_type = -1
chan_type_str = 'N/A'
try:
chan_type = ai_config.get_chan_type(chan)
chan_type_str = chan_type.name
except ULException as ul_error:
if ul_error.error_code != ULError.CONFIG_NOT_SUPPORTED:
raise ul_error
if chan_type == AiChanType.TC:
tc_type = ai_config.get_chan_tc_type(chan)
chan_type_str += ' Type ' + tc_type.name
elif (chan_type == AiChanType.RTD
or chan_type == AiChanType.THERMISTOR):
connect_type = ai_config.get_chan_sensor_connection_type(chan)
chan_type_str += ' ' + connect_type.name
print(' Channel', chan, 'type:', chan_type_str)
print(' Temperature scaling:', scale.name)
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
system('clear')
try:
while True:
try:
display_strings = []
# Read data for the specified analog input channels.
for channel in range(low_channel, high_channel + 1):
try:
data = ai_device.t_in(channel, scale)
display_strings.append('Channel(' + str(channel) +
') Data: ' +
'{:10.6f}'.format(data))
except ULException as ul_error:
if ul_error.error_code == ULError.OPEN_CONNECTION:
display_strings.append('Channel(' +
str(channel) +
') Data: ' +
'Open Connection')
else:
raise ul_error
reset_cursor()
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
# Display data for the specified analog input channels.
for display_string in display_strings:
clear_eol()
print(display_string)
sleep(0.3)
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
def main():
timer_number = 0
frequency = 1000.0 # Hz
duty_cycle = 0.5 # 50 percent
pulse_count = 0 # Continuous
initial_delay = 0.0
idle_state = TmrIdleState.LOW
options = PulseOutOption.DEFAULT
interface_type = InterfaceType.USB
daq_device = None
tmr_device = None
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
# Verify at least one DAQ device is detected.
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create a DaqDevice object from the first descriptor.
daq_device = DaqDevice(devices[0])
tmr_device = daq_device.get_tmr_device()
# Verify the specified DAQ device supports timers.
if tmr_device is None:
raise Exception('Error: The DAQ device does not support timers')
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
# Establish a connection to the device.
daq_device.connect()
print('\n', descriptor.dev_string, 'ready')
print(' Function demonstrated: TmrDevice.pulse_out_start')
print(' Timer:', timer_number)
print(' Frequency:', frequency, 'Hz')
print(' Duty cycle:', duty_cycle)
print(' Initial delay:', initial_delay)
try:
input('\nHit ENTER to continue')
except (NameError, SyntaxError):
pass
# Start the timer pulse output.
frequency, duty_cycle, initial_delay = tmr_device.pulse_out_start(
timer_number, frequency, duty_cycle, pulse_count, initial_delay,
idle_state, options)
system('clear')
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
print(' Actual frequency:', frequency, 'Hz')
print(' Actual duty cycle:', duty_cycle, 'Hz')
print(' Actual initial delay:', initial_delay, 'Hz')
try:
print(
'\n Outputting {0:.6f} Hz pulse with duty cycle {1:.3f} for timer {2:d}'
.format(frequency, duty_cycle, timer_number))
status = tmr_device.get_pulse_out_status(timer_number)
count = 0
if status == TmrStatus.RUNNING:
# If the status is RUNNING, then this timer does support the get_pulse_out_status()
# function so the status is checked to determine if the pulse output is stopped
# due to an error.
while status == TmrStatus.RUNNING:
status = tmr_device.get_pulse_out_status(timer_number)
print_status_dots(count)
count += 1
else:
# If the status is IDLE, then this timer does not support the get_pulse_out_status()
# function so we will wait for user input to stop the pulse output.
while True:
print_status_dots(count)
count += 1
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Stop the scan.
if tmr_device:
tmr_device.pulse_out_stop(timer_number)
stdout.write(ERASE_LINE)
print('\r Status:', TmrStatus.IDLE)
# Disconnect from the DAQ device.
if daq_device.is_connected():
daq_device.disconnect()
# Release the DAQ device resource.
daq_device.release()
def main(data_write_mode = ''):
daq_device = None
ai_device = None
status = ScanStatus.IDLE
descriptor_index = 0
range_index = 0
interface_type = InterfaceType.USB
low_channel = 0
high_channel = 0
rate = 100000 # Samples/second/channel
buffer_length = 200000
f_transmit = 36000 # fundamental frequency of transmitter
channel_num = high_channel-low_channel+1
samples_per_channel = int(float(buffer_length)/float(channel_num))
file_length = 2 # Seconds
rows_of_data = (float(file_length)/((float(buffer_length)/2)/(float(rate)*float(channel_num))))*((float(buffer_length)/2)/float(channel_num))
scan_options = ScanOption.CONTINUOUS
flags = AInScanFlag.DEFAULT
#CONTROL ALGORITHM PARAMETERS:
velocity = 1 #tune speed
beta = 0.01 #tune turning
heading = 0
past_freq = f_transmit
dH = -1.0001
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ', devices[i].product_name, ' (', devices[i].unique_id, ')', sep='')
# Create the DAQ device object associated with the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the AiDevice object and verify that it is valid.
ai_device = daq_device.get_ai_device()
if ai_device is None:
raise Exception('Error: The DAQ device does not support analog input')
# Verify that the specified device supports hardware pacing for analog input.
ai_info = ai_device.get_info()
if not ai_info.has_pacer():
raise Exception('\nError: The specified DAQ device does not support hardware paced analog input')
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
# The default input mode is SINGLE_ENDED.
input_mode = AiInputMode.SINGLE_ENDED
# If SINGLE_ENDED input mode is not supported, set to DIFFERENTIAL.
if ai_info.get_num_chans_by_mode(AiInputMode.SINGLE_ENDED) <= 0:
input_mode = AiInputMode.DIFFERENTIAL
# Get the number of channels and validate the high channel number.
number_of_channels = ai_info.get_num_chans_by_mode(input_mode)
if high_channel >= number_of_channels:
high_channel = number_of_channels - 1
channel_count = high_channel - low_channel + 1
# Get a list of supported ranges and validate the range index.
ranges = ai_info.get_ranges(input_mode)
if range_index >= len(ranges):
range_index = len(ranges) - 1
# Allocate a buffer to receive the data.
data = create_float_buffer(channel_count, samples_per_channel)
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstrated: ai_device.a_in_scan()')
print(' Channels: ', low_channel, '-', high_channel)
print(' Input mode: ', input_mode.name)
print(' Range: ', ranges[range_index].name)
print(' Samples per channel: ', samples_per_channel)
print(' Rate: ', rate, 'Hz')
print(' Scan options:', display_scan_options(scan_options))
print(" Output File Rows:" +str(rows_of_data))
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
system('clear')
print('\nHit ^C to exit\n')
#Set up threshold for where the dumps should occur in the buffer
#Currently configured for dumping half of the buffer
threshold = (float(len(data))/2) - (float(len(data))/2)%channel_count
data_range = [range(int(threshold)),range(int(threshold),len(data))]
#Setting up whether or not to write in binary mode
write_mode = 'w'+data_write_mode
# Start the acquisition.
rate = ai_device.a_in_scan(low_channel, high_channel, input_mode, ranges[range_index], samples_per_channel,
rate, scan_options, flags, data)
#open first text file
start=time.time()
f=open('./data/'+'{:.6f}'.format(start)+".txt",write_mode)
try:
past_index = -1 #Initiated at -1 to because index is -1 until buffer is written to
while True:
#Get the status of the background operation
status, transfer_status = ai_device.get_scan_status()
#Make new file after fixed amount of time set by 'file_length'
if time.time()-start>=file_length:
f.close
start=time.time()
f=open('./data/'+'{:.6f}'.format(start)+".txt",write_mode)
#get current index in filling the buffer to know when to clear it
index = transfer_status.current_index
#write half buffer to txt file, find max freq, and update heading if buffer fills past halfway point
if past_index<=threshold and index>threshold:
#dumps data
data_fft, data_dump = dump_data(f, data, data_range[0], channel_count)
#find fundamental frequency within 500Hz of f_transmit
freq = fourier_analysis(data_fft,rate,f_transmit,500)
#new heading
past_freq, heading, dH = heading_adjust(freq, past_freq, beta, heading, dH)
print('HEADING: %s FREQ: %d dH: %d' %(str(heading), past_freq,dH))
nav_solution(dH,heading)
#write half buffer to txt file, find max freq, and update heading if buffer filled to end and is overwriting first half
if past_index>index:
#dumps data
data_fft, data_dump = dump_data(f, data, data_range[1], channel_count)
#find fundamental frequency within 500Hz of f_transmit
freq = fourier_analysis(data_fft,rate,f_transmit,500)
#new heading
past_freq, heading, dH = heading_adjust(freq, past_freq, beta, heading, dH)
print('HEADING: %s FREQ: %d dH: %d' %(str(heading), past_freq,dH))
nav_solution(dH,heading)
past_index = index
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Stop the acquisition if it is still running.
if status == ScanStatus.RUNNING:
ai_device.scan_stop()
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
def main():
daq_device = None
ctr_device = None
status = ScanStatus.IDLE
descriptor_index = 0
interface_type = InterfaceType.USB
low_encoder = 0
encoder_count = 2
sample_rate = 1000.0 # Hz
samples_per_channel = 10000
scan_options = ScanOption.CONTINUOUS
scan_flags = CInScanFlag.DEFAULT
encoder_type = CounterMeasurementType.ENCODER
encoder_mode = CounterMeasurementMode.ENCODER_X1 | CounterMeasurementMode.ENCODER_CLEAR_ON_Z
edge_detection = CounterEdgeDetection.RISING_EDGE
tick_size = CounterTickSize.TICK_20ns
debounce_mode = CounterDebounceMode.NONE
debounce_time = CounterDebounceTime.DEBOUNCE_0ns
config_flags = CConfigScanFlag.DEFAULT
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create the DAQ device object associated with the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the CtrDevice object and verify that it is valid.
ctr_device = daq_device.get_ctr_device()
if ctr_device is None:
raise Exception('Error: The DAQ device does not support counters')
# Verify that the specified device supports hardware pacing for counters.
ctr_info = ctr_device.get_info()
if not ctr_info.has_pacer():
raise Exception(
'\nError: The specified DAQ device does not support hardware paced counter input'
)
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
# Get the encoder counter channels.
encoder_counters = get_supported_encoder_counters(ctr_info)
if len(encoder_counters) == 0:
raise Exception(
'\nError: The specified DAQ device does not support encoder channels'
)
# Verify that the low_encoder number is valid.
first_encoder = encoder_counters[0]
if low_encoder < first_encoder:
low_encoder = first_encoder
if low_encoder > first_encoder + len(encoder_counters) - 1:
low_encoder = first_encoder
# Verify that the encoder count is valid.
if encoder_count > len(encoder_counters):
encoder_count = len(encoder_counters)
# Set the high_encoder channel.
high_encoder = low_encoder + encoder_count - 1
if high_encoder > first_encoder + len(encoder_counters) - 1:
high_encoder = first_encoder + len(encoder_counters) - 1
# update the actual number of encoders being used
encoder_count = high_encoder - low_encoder + 1
# Clear the counter, and configure the counter as an encoder.
for encoder in range(low_encoder, high_encoder + 1):
ctr_device.c_config_scan(encoder, encoder_type, encoder_mode,
edge_detection, tick_size, debounce_mode,
debounce_time, config_flags)
# Allocate a buffer to receive the data.
data = create_int_buffer(encoder_count, samples_per_channel)
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstrated: ctr_device.c_config_scan()')
print(' Counter(s):', low_encoder, '-', high_encoder)
print(' Sample rate:', sample_rate, 'Hz')
print(' Scan options:', display_scan_options(scan_options))
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
# Start the scan
ctr_device.c_in_scan(low_encoder, high_encoder, samples_per_channel,
sample_rate, scan_options, scan_flags, data)
system('clear')
try:
while True:
try:
status, transfer_status = ctr_device.get_scan_status()
reset_cursor()
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
print('actual scan rate = ', '{:.6f}'.format(sample_rate),
'Hz\n')
index = transfer_status.current_index
print('currentScanCount = ',
transfer_status.current_scan_count)
print('currentTotalCount = ',
transfer_status.current_total_count)
print('currentIndex = ', index, '\n')
for encoder_index in range(encoder_count):
print('chan =', (encoder_index + low_encoder), ': ',
'{:.6f}'.format(data[index + encoder_index]))
sleep(0.1)
if status != ScanStatus.RUNNING:
break
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
if status == ScanStatus.RUNNING:
ctr_device.scan_stop()
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
def main():
interface_type = InterfaceType.USB
output_channel = 0
daq_device = None
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
# Verify at least one DAQ device is detected.
if number_of_devices == 0:
raise Exception('Error: No DAQ device is detected')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create a DaqDevice object from the first descriptor.
daq_device = DaqDevice(devices[0])
ao_device = daq_device.get_ao_device()
# Verify the specified DAQ device supports analog output.
if ao_device is None:
raise Exception(
'Error: The DAQ device does not support analog output')
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
# Establish a connection to the device.
daq_device.connect()
ao_info = ao_device.get_info()
output_range = ao_info.get_ranges()[
0] # Select the first supported range.
print('\n', descriptor.dev_string, 'ready')
print(' Function demonstrated: AoDevice.a_out')
print(' Channel:', output_channel)
print(' Range:', output_range.name)
try:
input('\nHit ENTER to continue')
except (NameError, SyntaxError):
pass
system('clear')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
print('*Enter non-numeric value to exit')
try:
while True:
try:
# Get and set a user specified output value.
out_val = input(' Enter output value (V): ')
ao_device.a_out(output_channel, output_range,
AOutFlag.DEFAULT, float(out_val))
# Clear the previous input request before the next input request.
stdout.write(CURSOR_UP + ERASE_LINE)
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Disconnect from the DAQ device.
if daq_device.is_connected():
daq_device.disconnect()
# Release the DAQ device resource.
daq_device.release()
def main():
daq_device = None
ai_device = None
status = ScanStatus.IDLE
descriptor_index = 0
range_index = 0
interface_type = InterfaceType.USB
low_channel = 0
high_channel = 3
samples_per_channel = 10000
rate = 100
scan_options = ScanOption.DEFAULTIO | ScanOption.CONTINUOUS
flags = AInScanFlag.DEFAULT
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create the DAQ device object associated with the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the AiDevice object and verify that it is valid.
ai_device = daq_device.get_ai_device()
if ai_device is None:
raise Exception(
'Error: The DAQ device does not support analog input')
# Verify that the specified device supports hardware pacing for analog input.
ai_info = ai_device.get_info()
if not ai_info.has_pacer():
raise Exception(
'\nError: The specified DAQ device does not support hardware paced analog input'
)
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
# The default input mode is SINGLE_ENDED.
input_mode = AiInputMode.SINGLE_ENDED
# If SINGLE_ENDED input mode is not supported, set to DIFFERENTIAL.
if ai_info.get_num_chans_by_mode(AiInputMode.SINGLE_ENDED) <= 0:
input_mode = AiInputMode.DIFFERENTIAL
# Get the number of channels and validate the high channel number.
number_of_channels = ai_info.get_num_chans_by_mode(input_mode)
if high_channel >= number_of_channels:
high_channel = number_of_channels - 1
channel_count = high_channel - low_channel + 1
# Get a list of supported ranges and validate the range index.
ranges = ai_info.get_ranges(input_mode)
if range_index >= len(ranges):
range_index = len(ranges) - 1
# Get a list of supported queue types.
queue_types = ai_info.get_queue_types()
if len(queue_types) == 0:
raise Exception('Error: The device does not support a gain queue')
# Assign each channel in the queue an input mode (SE/DIFF) and a range. If multiple
# ranges are supported, we will cycle through them and repeat ranges if the number
# of channels exceeds the number of ranges.
#
# This block of code could be used to set other queue elements such as the input mode
# and channel list.
queue_list = []
for i in range(channel_count):
queue_element = AiQueueElement()
queue_element.channel = i
queue_element.input_mode = input_mode
queue_element.range = ranges[range_index]
queue_list.append(queue_element)
range_index += 1
if range_index >= len(ranges):
range_index = 0
# Load the queue.
ai_device.a_in_load_queue(queue_list)
data = create_float_buffer(channel_count, samples_per_channel)
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstrated: ai_device.a_in_load_queue()')
print(' Channels: ', low_channel, '-', high_channel)
for i in range(channel_count):
print(' Channel:', queue_list[i].channel, ', Input mode:',
AiInputMode(queue_list[i].input_mode).name, ', Range:',
Range(queue_list[i].range).name)
print(' Samples per channel: ', samples_per_channel)
print(' Rate: ', rate, 'Hz')
print(' Scan options:', display_scan_options(scan_options))
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
# Start the acquisition.
#
# When using the queue, the low_channel, high_channel, input_mode, and range
# parameters are ignored since they are specified in queue_array.
rate = ai_device.a_in_scan(low_channel, high_channel, input_mode,
ranges[range_index], samples_per_channel,
rate, scan_options, flags, data)
system('clear')
try:
while True:
try:
# Get the status of the background operation
status, transfer_status = ai_device.get_scan_status()
reset_cursor()
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
print('actual scan rate = ', '{:.6f}'.format(rate), 'Hz\n')
index = transfer_status.current_index
print('currentTotalCount = ',
transfer_status.current_total_count)
print('currentScanCount = ',
transfer_status.current_scan_count)
print('currentIndex = ', index, '\n')
# Display the data.
for i in range(channel_count):
print('chan =', i + low_channel, ': ',
'{:.6f}'.format(data[index + i]))
sleep(0.1)
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Stop the acquisition if it is still running.
if status == ScanStatus.RUNNING:
ai_device.scan_stop()
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
def main():
low_counter = 0
high_counter = 1
samples_per_channel = 2000 # Two second buffer (sample_rate * 2)
sample_rate = 1000.0 # Hz
scan_options = ScanOption.CONTINUOUS
scan_flags = CInScanFlag.DEFAULT
interface_type = InterfaceType.USB
daq_device = None
ctr_device = None
scan_status = ScanStatus.IDLE
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
# Verify at least one DAQ device is detected.
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create a DaqDevice object from the first descriptor.
daq_device = DaqDevice(devices[0])
ctr_device = daq_device.get_ctr_device()
# Verify the specified DAQ device supports counters.
if ctr_device is None:
raise Exception('Error: The DAQ device does not support counters')
# Verify the specified DAQ device supports hardware pacing for counters.
ctr_info = ctr_device.get_info()
if not ctr_info.has_pacer():
raise Exception(
'Error: The DAQ device does not support paced counter inputs')
# Verify that the selected counters support event counting.
verify_counters_support_events(ctr_info, low_counter, high_counter)
number_of_counters = high_counter - low_counter + 1
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
# Establish a connection to the device.
daq_device.connect()
print('\n', descriptor.dev_string, 'ready')
print(' Function demonstrated: CtrDevice.c_in_scan')
print(' Counter(s):', low_counter, '-', high_counter)
print(' Samples per channel:', samples_per_channel)
print(' Sample rate:', sample_rate, 'Hz')
print(' Scan options:', display_scan_options(scan_options))
try:
input('\nHit ENTER to continue')
except (NameError, SyntaxError):
pass
# Create a buffer for input data.
data = create_int_buffer(number_of_counters, samples_per_channel)
# Start the input scan.
sample_rate = ctr_device.c_in_scan(low_counter, high_counter,
samples_per_channel, sample_rate,
scan_options, scan_flags, data)
system('clear')
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
print(' Actual scan rate: ', sample_rate, 'Hz')
try:
while True:
try:
# Read and display the current scan status.
scan_status, transfer_status = ctr_device.get_scan_status()
if scan_status != ScanStatus.RUNNING:
break
print(' Current scan count: ',
transfer_status.current_scan_count)
print(' Current total count:',
transfer_status.current_total_count)
print(' Current index: ',
transfer_status.current_index)
print('')
# Read and display the data for each counter.
for counter_index in range(number_of_counters):
counter_value = data[transfer_status.current_index -
counter_index]
print(' Counter ', (counter_index + low_counter),
':',
str(counter_value).rjust(12),
sep='')
stdout.flush()
sleep(0.1)
# Clear the previous status before displaying the next status.
for line in range(4 + number_of_counters):
stdout.write(CURSOR_UP + ERASE_LINE)
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Stop the scan.
if scan_status == ScanStatus.RUNNING:
ctr_device.scan_stop()
# Disconnect from the DAQ device.
if daq_device.is_connected():
daq_device.disconnect()
# Release the DAQ device resource.
daq_device.release()
return
def main():
daq_device = None
descriptor_index = 0
range_index = 0
interface_type = InterfaceType.USB
low_channel = 0
high_channel = 3
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ', devices[i].product_name, ' (', devices[i].unique_id, ')', sep='')
# Create the DAQ device object associated with the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the AiDevice object and verify that it is valid.
ai_device = daq_device.get_ai_device()
if ai_device is None:
raise Exception('Error: The DAQ device does not support analog input')
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
ai_info = ai_device.get_info()
# The default input mode is SINGLE_ENDED.
input_mode = AiInputMode.SINGLE_ENDED
# If SINGLE_ENDED input mode is not supported, set to DIFFERENTIAL.
if ai_info.get_num_chans_by_mode(AiInputMode.SINGLE_ENDED) <= 0:
input_mode = AiInputMode.DIFFERENTIAL
# Get the number of channels and validate the high channel number.
number_of_channels = ai_info.get_num_chans_by_mode(input_mode)
if high_channel >= number_of_channels:
high_channel = number_of_channels - 1
# Get a list of supported ranges and validate the range index.
ranges = ai_info.get_ranges(input_mode)
if range_index >= len(ranges):
range_index = len(ranges) - 1
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstrated: ai_device.a_in()')
print(' Channels: ', low_channel, '-', high_channel)
print(' Input mode: ', input_mode.name)
print(' Range: ', ranges[range_index].name)
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
system('clear')
try:
while True:
try:
reset_cursor()
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ', descriptor.dev_string, ' (',
descriptor.unique_id, ')\n', sep='')
# Display data for the specified analog input channels.
for channel in range(low_channel, high_channel + 1):
data = ai_device.a_in(channel, input_mode, ranges[range_index], AInFlag.DEFAULT)
print('Channel(', channel, ') Data: ', '{:.6f}'.format(data), sep='')
sleep(0.1)
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
def main():
daq_device = None
ai_device = None
status = ScanStatus.IDLE
descriptor_index = 0
range_index = 0
iepe_mode = IepeMode.ENABLED
coupling = CouplingMode.AC
sensor_sensitivity = 1.0 # volts per unit
interface_type = InterfaceType.USB
low_channel = 0
high_channel = 3
samples_per_channel = 10000
rate = 100
scan_options = ScanOption.CONTINUOUS
flags = AInScanFlag.DEFAULT
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
# Verify at least one DAQ device is detected.
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ',
devices[i].product_name,
' (',
devices[i].unique_id,
')',
sep='')
# Create a DaqDevice object from the first descriptor.
daq_device = DaqDevice(devices[descriptor_index])
# Get the AiDevice object and verify that it is valid.
ai_device = daq_device.get_ai_device()
if ai_device is None:
raise Exception(
'Error: The DAQ device does not support analog input')
# Verify the device supports hardware pacing for analog input.
ai_info = ai_device.get_info()
if not ai_info.has_pacer():
raise Exception('Error: The DAQ device does not support hardware ',
'paced analog input')
# Verify the device supports IEPE
if not ai_info.supports_iepe():
raise Exception('Error: The DAQ device does not support IEPE')
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
# The default input mode is SINGLE_ENDED.
input_mode = AiInputMode.SINGLE_ENDED
# If SINGLE_ENDED input mode is not supported, set to DIFFERENTIAL.
if ai_info.get_num_chans_by_mode(AiInputMode.SINGLE_ENDED) <= 0:
input_mode = AiInputMode.DIFFERENTIAL
# Get the number of channels and validate the high channel number.
number_of_channels = ai_info.get_num_chans_by_mode(input_mode)
if high_channel >= number_of_channels:
high_channel = number_of_channels - 1
channel_count = high_channel - low_channel + 1
# Get a list of supported ranges and validate the range index.
ranges = ai_info.get_ranges(input_mode)
if range_index >= len(ranges):
range_index = len(ranges) - 1
# Set IEPE mode, AC coupling and sensor sensitivity for each channel
ai_config = ai_device.get_config()
for chan in range(low_channel, high_channel + 1):
ai_config.set_chan_iepe_mode(chan, iepe_mode)
ai_config.set_chan_coupling_mode(chan, coupling)
ai_config.set_chan_sensor_sensitivity(chan, sensor_sensitivity)
data = create_float_buffer(channel_count, samples_per_channel)
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstrated: ai_device.a_in_scan()')
print(' Channels: ', low_channel, '-', high_channel)
print(' Input mode: ', input_mode.name)
print(' Range: ', ranges[range_index].name)
print(' Samples per channel: ', samples_per_channel)
print(' Rate: ', rate, 'Hz')
print(' Scan options:', display_scan_options(scan_options))
print(' Sensor Sensitivity: {:.6f}'.format(sensor_sensitivity),
'(V/unit)')
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
system('clear')
rate = ai_device.a_in_scan(low_channel, high_channel, input_mode,
ranges[range_index], samples_per_channel,
rate, scan_options, flags, data)
try:
while True:
try:
status, transfer_status = ai_device.get_scan_status()
index = transfer_status.current_index
if index >= 0:
system('clear')
print('Please enter CTRL + C to terminate the process',
'\n')
print('Active DAQ device: ',
descriptor.dev_string,
' (',
descriptor.unique_id,
')\n',
sep='')
print('Actual scan rate = {:.6f}\n'.format(rate))
print('currentTotalCount = ',
transfer_status.current_total_count)
print('currentScanCount = ',
transfer_status.current_scan_count)
print('currentIndex = ', index, '\n')
for i in range(channel_count):
print('chan ', i + low_channel, ' = ',
'{:.6f}'.format(data[index + i]))
sleep(0.1)
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Stop the acquisition if it is still running.
if status == ScanStatus.RUNNING:
ai_device.scan_stop()
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
from uldaq import (get_daq_device_inventory, DaqDevice, InterfaceType,
DigitalDirection, DigitalPortIoType)
daq_device = None
interface_type = InterfaceType.USB
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
daq_device = DaqDevice(devices[0])
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
if daq_device:
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()
def main():
daq_device = None
ai_device = None
status = ScanStatus.IDLE
descriptor_index = 0
range_index = 0
trigger_type_index = 0
interface_type = InterfaceType.USB
low_channel = 0
high_channel = 3
samples_per_channel = 10000
rate = 100
scan_options = ScanOption.CONTINUOUS | ScanOption.EXTTRIGGER
flags = AInScanFlag.DEFAULT
try:
# Get descriptors for all of the available DAQ devices.
devices = get_daq_device_inventory(interface_type)
number_of_devices = len(devices)
if number_of_devices == 0:
raise Exception('Error: No DAQ devices found')
print('Found', number_of_devices, 'DAQ device(s):')
for i in range(number_of_devices):
print(' ', devices[i].product_name, ' (', devices[i].unique_id, ')', sep='')
# Create the DAQ device object associated with the specified descriptor index.
daq_device = DaqDevice(devices[descriptor_index])
# Get the AiDevice object and verify that it is valid.
ai_device = daq_device.get_ai_device()
if ai_device is None:
raise Exception('Error: The DAQ device does not support analog input')
# Verify that the specified device supports hardware pacing for analog input.
ai_info = ai_device.get_info()
if not ai_info.has_pacer():
raise Exception('\nError: The specified DAQ device does not support hardware paced analog input')
# Establish a connection to the DAQ device.
descriptor = daq_device.get_descriptor()
print('\nConnecting to', descriptor.dev_string, '- please wait...')
daq_device.connect()
# The default input mode is SINGLE_ENDED.
input_mode = AiInputMode.SINGLE_ENDED
# If SINGLE_ENDED input mode is not supported, set to DIFFERENTIAL.
if ai_info.get_num_chans_by_mode(AiInputMode.SINGLE_ENDED) <= 0:
input_mode = AiInputMode.DIFFERENTIAL
# Get the number of channels and validate the high channel number.
number_of_channels = ai_info.get_num_chans_by_mode(input_mode)
if high_channel >= number_of_channels:
high_channel = number_of_channels - 1
channel_count = high_channel - low_channel + 1
# Get a list of supported ranges and validate the range index.
ranges = ai_info.get_ranges(input_mode)
if range_index >= len(ranges):
range_index = len(ranges) - 1
# Get a list of trigger types.
trigger_types = ai_info.get_trigger_types()
if len(trigger_types) == 0:
raise Exception('Error: The device does not support an external trigger')
# Set the trigger.
#
# This example uses the default values for setting the trigger so there is no need to call this function.
# If you want to change the trigger type (or any other trigger parameter), uncomment this function call and
# change the trigger type (or any other parameter)
ai_device.set_trigger(trigger_types[trigger_type_index], 0, 0, 0, 0)
data = create_float_buffer(channel_count, samples_per_channel)
print('\n', descriptor.dev_string, ' ready', sep='')
print(' Function demonstrated: ai_device.set_trigger()')
print(' Channels: ', low_channel, '-', high_channel)
print(' Input mode: ', input_mode.name)
print(' Range: ', ranges[range_index].name)
print(' Samples per channel: ', samples_per_channel)
print(' Rate: ', rate, 'Hz')
print(' Scan options:', display_scan_options(scan_options))
print(' Trigger type:', trigger_types[trigger_type_index].name)
try:
input('\nHit ENTER to continue\n')
except (NameError, SyntaxError):
pass
system('clear')
ai_device.a_in_scan(low_channel, high_channel, input_mode, ranges[range_index], samples_per_channel, rate,
scan_options, flags, data)
print('Please enter CTRL + C to quit waiting for trigger\n')
print('Waiting for trigger ...\n')
try:
while True:
try:
status, transfer_status = ai_device.get_scan_status()
index = transfer_status.current_index
if index >= 0:
system('clear')
print('Please enter CTRL + C to terminate the process\n')
print('Active DAQ device: ', descriptor.dev_string,
' (', descriptor.unique_id, ')\n', sep='')
print('currentTotalCount = ', transfer_status.current_total_count)
print('currentScanCount = ', transfer_status.current_scan_count)
print('currentIndex = ', index, '\n')
for i in range(channel_count):
print('chan =',
i + low_channel, ': ',
'{:.6f}'.format(data[index + i]))
sleep(0.1)
except (ValueError, NameError, SyntaxError):
break
except KeyboardInterrupt:
pass
except Exception as e:
print('\n', e)
finally:
if daq_device:
# Stop the acquisition if it is still running.
if status == ScanStatus.RUNNING:
ai_device.scan_stop()
if daq_device.is_connected():
daq_device.disconnect()
daq_device.release()