def save(self):
"""
Saves the recorded file to the desired location.
:return:
"""
Log.i(TAG, "Clicked save")
if len(self.session_files) > 0:
save_path = PopUp.save_file(self)
if save_path != '':
Log.i(
TAG, "Saving {} at {}".format(self.session_files[-1],
save_path))
shutil.copyfile(self.session_files[-1], save_path)
Log.i(
TAG, "Saved {} at {}".format(self.session_files[-1],
save_path))
self.ui.tBrowser_Log.append(
"Saved data at {}.".format(save_path))
else:
Log.i(TAG, "No file name entered, so file wasn't saved.")
else:
Log.i(TAG, "No signal files in current session.")
self.ui.tBrowser_Log.append("Terminated save due to an error.")
PopUp.warning(self, Constants.app_title,
"Record signal before saving.")
def start(self):
"""
Starts all processes, based on configuration given in constructor.
:return:
"""
self.reset_buffers(self._samples)
if self._export:
self._csv_process = CSVProcess(path=self._path)
self._parser_process = ParserProcess(
self._queue, store_reference=self._csv_process)
self._filepath = self._csv_process.get_filepath()
else:
self._parser_process = ParserProcess(self._queue)
if self._source == SourceType.serial:
self._acquisition_process = SerialProcess(self._parser_process)
if self._acquisition_process.open(port=self._port, speed=self._speed):
self._parser_process.start()
if self._export:
self._csv_process.start()
self._acquisition_process.start()
return True
else:
Log.i(TAG, "Port is not available")
return False
def stop(self):
"""
Signals the process to stop acquiring data.
:return:
"""
Log.i(TAG, "Process finishing...")
self._exit.set()
def __init__(self, parser_process):
"""
Initialises values for process.
:param parser_process: Reference to a ParserProcess instance.
:type parser_process: ParserProcess.
"""
multiprocessing.Process.__init__(self)
self._exit = multiprocessing.Event()
self._parser = parser_process
self._serial = serial.Serial()
Log.i(TAG, "Process ready")
def _update_sample_size(self):
"""
Updates the sample size of the plot.
This function is connected to the valueChanged signal of the sample Spin Box.
:return:
"""
if self.worker is not None:
Log.i(TAG, "Changing sample size")
self.worker.reset_buffers(self.ui.sBox_Samples.value())
self.ui.tBrowser_Log.append("Updated sample size: {}.".format(
self.ui.sBox_Samples.value()))
def closeEvent(self, evnt):
"""
Overrides the QTCloseEvent.
This function is connected to the clicked signal of the close button of the window.
:param evnt: QT evnt.
:return:
"""
if self.worker.is_running():
Log.i(TAG, "Window closed without stopping capture, stopping it")
self.ui.tBrowser_Log.append("Closing window.")
self.stop()
def help(self):
"""
Opens the message for the program.
This function is connected to the clicked signal of the Help button.
:return:
"""
Log.i(TAG, "Clicked help")
PopUp.message(
self, Constants.app_title + " Instructions",
"View Options:\n - Start: starts data stream\n - Stop: stops data stream\n\nRecord Options\n - n Seconds: enter the desired time length\n - Record: starts recording data\n - Save: save recorded data\n\nBCI/Plot Options\n - Ports: select the serial device port\n - Baud Rate: select the baud rate\n - n Samples: enter the desired samples #"
)
def _update_seconds(self):
"""
Updates the seconds for recording.
This function is connected to the valueChanged signal of the sample Spin Box.
:return:
"""
if self.worker is not None:
Log.i(TAG, "Changing recording length")
self.worker.reset_buffers(self.ui.sBox_Seconds.value())
self.ui.tBrowser_Log.append(
"Updated recording length: {} seconds.".format(
self.ui.sBox_Seconds.value()))
def _update_baud(self):
"""
Updates the baud rate.
:return:
"""
if self.ui.cBox_BaudRate.currentText() == "Baud Rate":
Log.i(TAG, "No baud rate selected")
self.ui.tBrowser_Log.append("No baud rate was selected.")
else:
Log.i(
TAG, "Updated baud rate: {}".format(
self.ui.cBox_BaudRate.currentText()))
self.ui.tBrowser_Log.append("Updated baud rate: {}.".format(
self.ui.cBox_BaudRate.currentText()))
def reset_buffers(self, samples):
"""
Setup/clear the internal buffers.
:param samples: Number of samples for the buffers.
:type samples: int.
:return:
"""
self._data_buffers = []
for tmp in Constants.plot_colors:
self._data_buffers.append(RingBuffer(samples))
self._time_buffer = RingBuffer(samples)
while not self._queue.empty():
self._queue.get()
Log.i(TAG, "Buffers cleared")
def run(self):
if Architecture.is_python_version(MinimalPython.major,
minor=MinimalPython.minor):
Log.i(TAG, "Starting mbci_lab")
win = mainWindow.MainWindow(samples=self._args.get_user_samples())
win.setWindowTitle("{} - {}".format(Constants.app_title,
Constants.app_version))
win.show()
self._app.exec()
Log.i(TAG, "Finishing mbci_lab\n")
win.close()
else:
self._fail()
self.close()
def stop(self):
"""
Stops the acquisition of the selected serial port.
This function is connected to the clicked signal of the Stop button.
:return:
"""
Log.i(TAG, "Clicked stop")
self._timer_plot.stop()
self._enable_ui(True)
self.worker.stop()
self.session_files.append(self.worker.get_filepath())
if self._isrecording == True:
self._isrecording = False
self.save()
self.ui.tBrowser_Log.append("Stopped data stream.")
def run(self):
"""
Process will monitor the internal buffer to write data to the export file,
and the process will loop again after timeout if more data is available.
:return:
"""
Log.i(TAG, "Process starting...")
self._csv = csv.writer(self._file,
delimiter=Constants.csv_delimiter,
quoting=csv.QUOTE_MINIMAL)
self._csv.writerow(['time', 'signal'])
while not self._exit.is_set():
self._consume_queue()
sleep(self._timeout)
# last check on the queue to completely remove data.
self._consume_queue()
Log.i(TAG, "Process finished")
self._file.close()
def _create_file(filename, path=None, extension=Constants.csv_extension):
"""
Creates the file to export the data.
:param filename: Name of the file where data will be exported.
:type filename: str.
:param path: Path where data file will be saved.
:type path: str.
:param extension: Extension to give to the export file.
:type extension: str.
:return: Reference to the export file.
"""
FileManager.create_dir(path)
full_path = FileManager.create_file(filename,
extension=extension,
path=os.path.abspath(path))
if not FileManager.file_exists(full_path):
Log.i(TAG, "Storing in {}".format(full_path))
return open(full_path, "a", newline=''), full_path
return None
def start(self):
"""
Starts the acquisition of the selected serial port.
This function is connected to the clicked signal of the Start button.
:return:
"""
Log.i(TAG, "Clicked start")
self.ui.tBrowser_Log.append("Started data stream.")
port_id, baud_rate = self.ui.cBox_Port.currentText(
), self.ui.cBox_BaudRate.currentText()
if (port_id != "Ports (Refresh)") and (baud_rate != "Baud Rate"):
self.worker = Worker(port=self.ui.cBox_Port.currentText(),
speed=int(
self.ui.cBox_BaudRate.currentText()),
samples=self.ui.sBox_Samples.value())
if self.worker.start():
self._timer_plot.start(Constants.plot_update_ms)
self._enable_ui(False)
else:
Log.i(TAG, "Port is not available")
PopUp.warning(
self, Constants.app_title,
"Selected port \"{}\" is not available".format(
self.ui.cBox_Port.currentText()))
else:
Log.i(TAG, "No port or baud rate was selected")
self.ui.tBrowser_Log.append("Terminated data stream due to error.")
PopUp.warning(self, Constants.app_title,
"Select a port and baud rate")
def record(self):
"""
Starts recording signal from the selected port. Function
is connected to the record button
:return:
"""
Log.i(TAG, "Clicked record")
self.ui.tBrowser_Log.append("Started recording data.")
self._isrecording = True
port_id, baud_rate = self.ui.cBox_Port.currentText(
), self.ui.cBox_BaudRate.currentText()
if (port_id != "Ports (Refresh)") and (baud_rate != "Baud Rate"):
self.worker = Worker(port=self.ui.cBox_Port.currentText(),
speed=int(
self.ui.cBox_BaudRate.currentText()),
samples=self.ui.sBox_Samples.value(),
export_enabled=True)
if self.worker.start():
self._timer_plot.start(Constants.plot_update_ms)
self._enable_ui(False)
else:
Log.i(TAG, "Port is not available")
PopUp.warning(
self, Constants.app_title,
"Selected port \"{}\" is not available".format(
self.ui.cBox_Port.currentText()))
return None
else:
Log.i(TAG, "No port or baud rate was selected")
self.ui.tBrowser_Log.append(
"Terminated data recording due to error.")
PopUp.warning(self, Constants.app_title,
"Select a port and baud rate")
return None
def _update_port(self):
"""
Updates the source and depending boxes on change.
This function is connected to the indexValueChanged signal of the Source ComboBox.
:return:
"""
tmp = self.ui.cBox_Port.currentText()
if tmp == "Ports (Refresh)":
Log.i(TAG, "Scanning source serial")
# clear boxes before adding new
self.ui.cBox_Port.clear()
ports = self.worker.get_source_ports(SourceType.serial)
ports.insert(0, "Ports (Refresh)")
if ports is not None:
self.ui.cBox_Port.addItems(ports)
self.ui.tBrowser_Log.append("Refreshed ports.")
else:
Log.i(TAG, "Serial port {} was selected".format(tmp))
self.ui.tBrowser_Log.append("Selected port: {}".format(
self.ui.cBox_Port.currentText()))
def __init__(self, filename=None, path=None, timeout=0.5):
"""
Sets up the file to export the data as CSV.
If filename is not specified, a default name based on time will be used.
:param filename: Name of the file where data will be exported.
:type filename: str.
:param path: Path where data file will be saved.
:type path: str.
:param timeout: Time to wait after emptying the internal buffer before next write.
:type timeout: float.
"""
multiprocessing.Process.__init__(self)
self._exit = multiprocessing.Event()
self._store_queue = multiprocessing.Queue()
self._csv = None
self._file = None
self._timeout = timeout
if filename is None:
filename = 'temp_{}'.format(
strftime(Constants.csv_default_filename, gmtime()))
self._file, self._filepath = self._create_file(filename, path=path)
Log.i(TAG, "Process ready")
def run(self):
"""
Reads the serial port expecting CSV until a stop call is made.
The expected format is comma (",") separated values, and a new line (CRLF or LF) as a new row.
While running, it will parse CSV data convert each value to float and added to a queue.
If incoming data from serial port can't be converted to float, that data will be discarded.
:return:
"""
Log.i(TAG, "Process starting...")
if self._is_port_available(self._serial.port):
if not self._serial.isOpen():
self._serial.open()
Log.i(TAG, "Port opened")
timestamp = time()
while not self._exit.is_set():
self._parser.add(
[time() - timestamp,
self._serial.readline()])
Log.i(TAG, "Process finished")
self._serial.close()
else:
Log.w(TAG, "Port is not opened")
else:
Log.w(TAG, "Port is not available")
