def simulate_bci_signal(fs, verbose=False):
"""
:param fs: sampling frequency
:param verbose: if verbose == True print info
"""
# setup stream
info = StreamInfo(name='NFBLab_data',
type='',
channel_count=1,
nominal_srate=fs)
channels = info.desc().append_child("channels")
channels.append_child("channel").append_child_value("name", 'BCI')
print('Stream info:\n\tname: {}, fs: {}Hz, channels: {}'.format(
info.name(), int(info.nominal_srate()), ['BCI']))
outlet = StreamOutlet(info)
print('Now sending data...')
# prepare main loop
start = time()
counter = 0
# main loop
while True:
while time() - start < counter / fs:
sleep(1 / fs)
x = 1 - int((counter % 1501) < 250)
outlet.push_sample([x])
counter += 1
if verbose:
if counter % fs == 0:
print(x)
def simulate_bci_signal(fs, chunk_size=8, verbose=False):
# setup stream
info = StreamInfo(name='NFBLab_data',
type='',
channel_count=1,
nominal_srate=fs)
channels = info.desc().append_child("channels")
channels.append_child("channel").append_child_value("name", 'BCI')
print('Stream info:\n\tname: {}, fs: {}Hz, channels: {}'.format(
info.name(), int(info.nominal_srate()), ['BCI']))
outlet = StreamOutlet(info)
print('Now sending data...')
# prepare main loop
start = time()
counter = chunk_size
x = x_base = np.ones((chunk_size, 1))
n_chunks = 0
# main loop
while True:
while time() - start < counter / fs:
sleep(1 / fs)
if np.random.randint(0, fs / chunk_size / 2) == 0:
x = x_base * np.random.randint(0, 2 + 1)
outlet.push_chunk(x)
n_chunks += 1
counter += chunk_size
if verbose:
# print('counter time: {:.2f}\ttime: {:.2f}'.format(counter/fs, time() - start))
if n_chunks % 50 == 0:
print('Chunk {} was sent'.format(n_chunks))
def __init__(self, info: pylsl.StreamInfo):
# create an inlet and connect it to the outlet we found earlier.
# max_buflen is set so data older the plot_duration is discarded
# automatically and we only pull data new enough to show it
# Also, perform online clock synchronization so all streams are in the
# same time domain as the local lsl_clock()
# (see https://labstreaminglayer.readthedocs.io/projects/liblsl/ref/enums.html#_CPPv414proc_clocksync)
# and dejitter timestamps
self.inlet = pylsl.StreamInlet(info, max_buflen=plot_duration,
processing_flags=pylsl.proc_clocksync | pylsl.proc_dejitter)
# store the name and channel count
self.name = info.name()
self.channel_count = info.channel_count()
print "MAC address (%s) is not defined..." %macAddress
print "connecting to BITalino(%s)..."
except ValueError:
print "MAC address (%s) is not defined..." %macAddress
print "connecting to BITalino(%s)..."
# Set battery threshold
device.battery(batteryThreshold)
# Read BITalino version
print device.version()
print "connected to BITalino(%s)" %macAddress
print "creating Signal stream..."
info = StreamInfo('BiTalino','BiTalino',+len(acqChannels),samplingRate,'float32','myuid34234');
# next make an outlet
outlet = StreamOutlet(info)
print"created Signal stream : %s" %info.name()
print("starting acquisition...")
# Start Acquisition
device.start(samplingRate, acqChannels)
# Read samples
while 1:
data=device.read(nSamples)
print data
outlet.push_sample(data[0][defaultChannel+1:])
# Turn BITalino led on
device.trigger(digitalOutput)
# Stop acquisition
device.stop()
# Close connection
outlet.close()
