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eConAlpha

eConAlpha

Bases: Thread

Source code in src\eConEXG\eConAlpha\data_reader.py 
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class eConAlpha(Thread):
    class Dev(Enum):
        SIGNAL = 10
        SIGNAL_START = 11
        IDLE = 30
        IDLE_START = 31
        TERMINATE = 40
        TERMINATE_START = 41

    dev_args = {
        "type": "eConAlpha",
        "fs_exg": 500,
        "fs_imu": 62.5,
        "channel_exg": {
            0: "CH0",
            1: "CH1",
            2: "CH2",
            3: "CH3",
            4: "CH4",
            5: "CH5",
            6: "CH6",
            7: "CH7",
        },
        "channel_imu": {
            0: "ACC_X",
            1: "ACC_Y",
            2: "ACC_Z",
            3: "GRY_X",
            4: "GRY_Y",
            5: "GRY_Z",
        },
        "AdapterInfo": "Serial Port",
        "samples_per_packet": 8,  # Number of samples per electrode to be sent in one packet
    }

    def __init__(self, port: Optional[str] = None) -> None:
        """
        Args:
            port: if not given, connect to the first available device.
        """
        super().__init__(daemon=True)
        self.__status = eConAlpha.Dev.TERMINATE
        if port is None:
            port = eConAlpha.find_devs()[0]
        self.__save_data = Queue()
        self.__parser = Parser()
        self.dev_args = deepcopy(eConAlpha.dev_args)
        self.dev = sock(port, self.__parser.threshold)
        self.set_frequency()
        self.__with_q = True
        self.__socket_flag = "Device not connected, please connect first."
        self.__bdf_flag = False
        try:
            self.dev.connect_socket()
        except Exception as e:
            try:
                self.dev.close_socket()
            finally:
                raise e
        self.__status = eConAlpha.Dev.IDLE_START
        self.__socket_flag = None
        self.__lsl_imu_flag = False
        self.__lsl_exg_flag = False
        self._bdf_file = None
        self.__enable_imu = False
        self.dev_args["name"] = port
        self.start()

    def set_frequency(self, fs_exg: Optional[int] = None):
        """
        Change the sampling frequency of eConAlpha.

        Args:
            fs_exg: sampling frequency of exg data, should be 250, 500, 1000 or 2000.
                fs_imu will be automatically set to 1/8 of fs_exg.

        Raises:
            ValueError: if fs_exg is not valid.
            NotImplementedError: device firmware too old, not supporting 500Hz.
        """
        if self.__status == eConAlpha.Dev.SIGNAL:
            raise Exception("Data acquisition already started, please stop first.")
        if fs_exg is None:
            fs_exg = self.dev_args["fs_exg"]
        if fs_exg not in [250, 500, 1000, 2000]:
            raise ValueError("fs_exg should be 250, 500, 1000, or 2000")
        self.dev_args["fs_exg"] = fs_exg
        fs_imu = fs_exg / 8
        self.dev_args["fs_imu"] = fs_imu
        if hasattr(self, "dev"):
            self.dev.set_frequency(fs_exg)

    def get_dev_info(self) -> dict:
        """
        Get current device information, including device name, hardware channel number, acquired channels, sample frequency, etc.

        Returns:
            A dictionary containing device information, which includes:
                `type`: hardware type;
                `channel_exg`: channel dictionary, including EXG channel index and name;
                `channel_imu`: channel dictionary, including IMU channel index and name;
                `AdapterInfo`: adapter used for connection;
                `fs_exg`: sample frequency of EXG in Hz;
                `fs_imu`: sample frequency of IMU in Hz;
        """
        return deepcopy(self.dev_args)

    @staticmethod
    def find_devs() -> list:
        """
        Find available eConAlpha devices.

        Returns:
            available device ports.

        Raises:
            Exception: if no eConAlpha device found.
        """
        return sock.find_devs()

    def get_data(
        self, timeout: Optional[float] = 0.02
    ) -> Optional[list[Optional[list]]]:
        """
        Acquire all available data, make sure this function is called in a loop when `with_q` is set to `True` in`start_acquisition_data()`

        Args:
            timeout: Non-negative value, blocks at most 'timeout' seconds and return, if set to `None`, blocks until new data available.

        Returns:
            A list of frames, each frame is made up of 5 exg data and 1 imu data in a shape as below:
                [[`exg_ch0_0,...,exg_ch8_0`],..., [`exg_ch0_7,...,exg_ch8_7`], [`acc_x`, `acc_y`, `acc_z`,`gry_x`,`gry_y`,`gry_z`]],
                    in which number `0~4` after `_` indicates the time order of channel data.

        Raises:
            Exception: if device not connected, connection failed, data transmission timeout/init failed, or unknown error.

        Data Unit:
            - exg: µV
            - acc: mg
            - gry: bps
        """
        self.__check_dev_status()
        if not self.__with_q:
            return
        try:
            data: list = self.__save_data.get(timeout=timeout)
        except queue.Empty:
            return []
        while not self.__save_data.empty():
            data.extend(self.__save_data.get())
        return data

    def start_acquisition_data(self, with_q: bool = True) -> None:
        """
        Send data acquisition command to device, block until data acquisition started or failed.

        Args:
            with_q: if True, signal data will be stored in a queue and **should** be acquired by calling `get_data()` in a loop in case data queue is full.
                if False, new data will not be directly available and can only be accessed through lsl stream.

        """
        self.__check_dev_status()
        self.__with_q = with_q
        if self.__status == eConAlpha.Dev.SIGNAL:
            return
        self.__status = eConAlpha.Dev.SIGNAL_START
        while self.__status not in [eConAlpha.Dev.SIGNAL, eConAlpha.Dev.TERMINATE]:
            time.sleep(0.01)
        self.__check_dev_status()

    def stop_acquisition(self) -> None:
        """
        Stop data or impedance acquisition, block until data acquisition stopped or failed.
        """
        self.__check_dev_status()
        self.__status = eConAlpha.Dev.IDLE_START
        while self.__status not in [eConAlpha.Dev.IDLE, eConAlpha.Dev.TERMINATE]:
            time.sleep(0.01)
        self.__check_dev_status()

    def open_lsl_exg(self):
        """
        Open LSL EXG stream, can be invoked after `start_acquisition_data()`.

        Raises:
            Exception: if data acquisition not started or LSL stream already opened.
            LSLException: if LSL stream creation failed.
            importError: if `pylsl` is not installed or liblsl not installed for unix like system.
        """
        if self.__status != eConAlpha.Dev.SIGNAL:
            raise Exception("Data acquisition not started, please start first.")
        if hasattr(self, "_lsl_exg"):
            raise Exception("LSL stream already opened.")
        from ..utils.lslWrapper import lslSender

        self._lsl_exg = lslSender(
            self.dev_args["channel_exg"],
            f"{self.dev_args['type']}EXG{self.dev_args['name'][-2:]}",
            "EXG",
            self.dev_args["fs_exg"],
            with_trigger=False,
        )
        self.__lsl_exg_flag = True

    def close_lsl_exg(self):
        """
        Close LSL EXG stream manually, invoked automatically after `stop_acquisition()` and `close_dev()`
        """
        self.__lsl_exg_flag = False
        if hasattr(self, "_lsl_exg"):
            del self._lsl_exg

    def open_lsl_imu(self):
        """
        Open LSL IMU stream, can be invoked after `start_acquisition_data()`.

        Raises:
            Exception: if data acquisition not started or LSL stream already opened.
            LSLException: if LSL stream creation failed.
            importError: if `pylsl` is not installed or liblsl not installed for unix like system.
        """
        if self.__status != eConAlpha.Dev.SIGNAL:
            raise Exception("Data acquisition not started, please start first.")
        if hasattr(self, "_lsl_imu"):
            raise Exception("LSL stream already opened.")
        from ..utils.lslWrapper import lslSender

        self._lsl_imu = lslSender(
            self.dev_args["channel_imu"],
            f"{self.dev_args['type']}IMU{self.dev_args['name'][-2:]}",
            "IMU",
            self.dev_args["fs_imu"],
            unit="degree",
            with_trigger=False,
        )
        self.__lsl_imu_flag = True

    def close_lsl_imu(self):
        """
        Close LSL IMU stream manually, invoked automatically after `stop_acquisition()` and `close_dev()`
        """
        self.__lsl_imu_flag = False
        if hasattr(self, "_lsl_imu"):
            del self._lsl_imu

    def setIMUFlag(self, check):
        self.__enable_imu = check

    def create_bdf_file(self, filename: str):
        """
        Create a BDF file and save data to it, invoke it after `start_acquisition_data()`.

        Args:
            filename: file name to save data, accept absolute or relative path.

        Raises:
            Exception: if data acquisition not started or `save_bdf_file` is invoked and BDF file already created.
            OSError: if BDF file creation failed, this may be caused by invalid file path or permission issue.
            importError: if `pyedflib` is not installed.
        """
        if self.__status != eConAlpha.Dev.SIGNAL:
            raise Exception("Data acquisition not started")
        if self._bdf_file is not None:
            raise Exception("BDF file already created.")
        from ..utils.bdfWrapper import bdfSaverEXG, bdfSaverEXGIMU

        if filename[-4:].lower() != ".bdf":
            filename += ".bdf"
        if self.__enable_imu:
            self._bdf_file = bdfSaverEXGIMU(
                filename,
                self.dev_args["channel_exg"],
                self.dev_args["fs_exg"],
                self.dev_args["channel_imu"],
                self.dev_args["fs_imu"],
                self.dev_args["type"],
            )
        else:
            self._bdf_file = bdfSaverEXG(
                filename,
                self.dev_args["channel_exg"],
                self.dev_args["fs_exg"],
                self.dev_args["type"],
            )
        self.__bdf_flag = True

    def close_bdf_file(self):
        """
        Close and save BDF file manually, invoked automatically after `stop_acquisition()` or `close_dev()`
        """
        self.__bdf_flag = False
        if self._bdf_file is not None:
            self._bdf_file.close_bdf()
            self._bdf_file = None

    def send_bdf_marker(self, marker: str):
        """
        Send marker to BDF file, can be invoked after `create_bdf_file()`, otherwise it will be ignored.

        Args:
            marker: marker string to write.
        """
        if hasattr(self, "_bdf_file"):
            self._bdf_file.write_Annotation(marker)

    def shock_band(self):
        """
        Send a command to vibrate the arm band
        """
        self.dev.shock_band()

    def close_dev(self):
        """
        Close device connection and release resources.
        """
        if self.__status != eConAlpha.Dev.TERMINATE:
            # ensure socket is closed correctly
            self.__status = eConAlpha.Dev.TERMINATE_START
            while self.__status != eConAlpha.Dev.TERMINATE:
                time.sleep(0.1)
        if self.is_alive():
            self.join()

    def __recv_data(self):
        try:
            self.dev.start_data()
            self.__status = eConAlpha.Dev.SIGNAL
        except Exception:
            self.__socket_flag = "SIGNAL mode initialization failed."
            self.__status = eConAlpha.Dev.TERMINATE_START

        while self.__status in [eConAlpha.Dev.SIGNAL]:
            try:
                data = self.dev.recv_socket()
                if not data:
                    raise Exception("Data transmission timeout.")
                ret = self.__parser.parse_data(data)
                if ret:
                    if self.__with_q:
                        self.__save_data.put(ret)
                    if self.__bdf_flag:
                        self._bdf_file.write_chunk(ret)
                    if self.__lsl_exg_flag:
                        self._lsl_exg.push_chunk(
                            [frame for frames in ret for frame in frames[:-1]]
                        )
                    if self.__lsl_imu_flag:
                        self._lsl_imu.push_chunk([frame[-1] for frame in ret])
            except Exception as e:
                print(e)
                self.__socket_flag = "Data transmission timeout."
                self.__status = eConAlpha.Dev.TERMINATE_START

        # clear buffer
        self.close_lsl_exg()
        self.close_lsl_imu()
        self.close_bdf_file()
        # self.dev.stop_recv()
        self.__parser.clear_buffer()
        self.__save_data.put(None)
        while self.__save_data.get() is not None:
            continue
        # stop recv data
        if self.__status != eConAlpha.Dev.TERMINATE_START:
            try:  # stop data acquisition when thread ended
                self.dev.stop_recv()
            except Exception:
                if self.__status == eConAlpha.Dev.IDLE_START:
                    self.__socket_flag = "Connection lost."
                self.__status = eConAlpha.Dev.TERMINATE_START

    def run(self):
        while self.__status != eConAlpha.Dev.TERMINATE_START:
            if self.__status == eConAlpha.Dev.SIGNAL_START:
                self.__recv_data()
            elif self.__status == eConAlpha.Dev.IDLE_START:
                self.__status = eConAlpha.Dev.IDLE
                while self.__status == eConAlpha.Dev.IDLE:
                    time.sleep(0.1)
            else:
                self.__socket_flag = f"Unknown status: {self.__status.name}"
                break
        try:
            self.dev.close_socket()
        finally:
            self.__status = eConAlpha.Dev.TERMINATE

    def __check_dev_status(self):
        if self.__socket_flag is None:
            return
        if self.is_alive():
            self.close_dev()
        raise Exception(str(self.__socket_flag))

__init__(port=None)

Parameters:

Name Type Description Default
port Optional[str]

if not given, connect to the first available device.

 None
Source code in src\eConEXG\eConAlpha\data_reader.py 
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def __init__(self, port: Optional[str] = None) -> None:
    """
    Args:
        port: if not given, connect to the first available device.
    """
    super().__init__(daemon=True)
    self.__status = eConAlpha.Dev.TERMINATE
    if port is None:
        port = eConAlpha.find_devs()[0]
    self.__save_data = Queue()
    self.__parser = Parser()
    self.dev_args = deepcopy(eConAlpha.dev_args)
    self.dev = sock(port, self.__parser.threshold)
    self.set_frequency()
    self.__with_q = True
    self.__socket_flag = "Device not connected, please connect first."
    self.__bdf_flag = False
    try:
        self.dev.connect_socket()
    except Exception as e:
        try:
            self.dev.close_socket()
        finally:
            raise e
    self.__status = eConAlpha.Dev.IDLE_START
    self.__socket_flag = None
    self.__lsl_imu_flag = False
    self.__lsl_exg_flag = False
    self._bdf_file = None
    self.__enable_imu = False
    self.dev_args["name"] = port
    self.start()

close_bdf_file()

Close and save BDF file manually, invoked automatically after stop_acquisition() or close_dev()

Source code in src\eConEXG\eConAlpha\data_reader.py 
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def close_bdf_file(self):
    """
    Close and save BDF file manually, invoked automatically after `stop_acquisition()` or `close_dev()`
    """
    self.__bdf_flag = False
    if self._bdf_file is not None:
        self._bdf_file.close_bdf()
        self._bdf_file = None

close_dev()

Close device connection and release resources.

Source code in src\eConEXG\eConAlpha\data_reader.py 
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def close_dev(self):
    """
    Close device connection and release resources.
    """
    if self.__status != eConAlpha.Dev.TERMINATE:
        # ensure socket is closed correctly
        self.__status = eConAlpha.Dev.TERMINATE_START
        while self.__status != eConAlpha.Dev.TERMINATE:
            time.sleep(0.1)
    if self.is_alive():
        self.join()

close_lsl_exg()

Close LSL EXG stream manually, invoked automatically after stop_acquisition() and close_dev()

Source code in src\eConEXG\eConAlpha\data_reader.py 
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def close_lsl_exg(self):
    """
    Close LSL EXG stream manually, invoked automatically after `stop_acquisition()` and `close_dev()`
    """
    self.__lsl_exg_flag = False
    if hasattr(self, "_lsl_exg"):
        del self._lsl_exg

close_lsl_imu()

Close LSL IMU stream manually, invoked automatically after stop_acquisition() and close_dev()

Source code in src\eConEXG\eConAlpha\data_reader.py 
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def close_lsl_imu(self):
    """
    Close LSL IMU stream manually, invoked automatically after `stop_acquisition()` and `close_dev()`
    """
    self.__lsl_imu_flag = False
    if hasattr(self, "_lsl_imu"):
        del self._lsl_imu

create_bdf_file(filename)

Create a BDF file and save data to it, invoke it after start_acquisition_data().

Parameters:

Name Type Description Default
filename str

file name to save data, accept absolute or relative path.

 required

Raises:

Type Description
Exception

if data acquisition not started or save_bdf_file is invoked and BDF file already created.
OSError

if BDF file creation failed, this may be caused by invalid file path or permission issue.
importError

if pyedflib is not installed.
Source code in src\eConEXG\eConAlpha\data_reader.py 
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def create_bdf_file(self, filename: str):
    """
    Create a BDF file and save data to it, invoke it after `start_acquisition_data()`.

    Args:
        filename: file name to save data, accept absolute or relative path.

    Raises:
        Exception: if data acquisition not started or `save_bdf_file` is invoked and BDF file already created.
        OSError: if BDF file creation failed, this may be caused by invalid file path or permission issue.
        importError: if `pyedflib` is not installed.
    """
    if self.__status != eConAlpha.Dev.SIGNAL:
        raise Exception("Data acquisition not started")
    if self._bdf_file is not None:
        raise Exception("BDF file already created.")
    from ..utils.bdfWrapper import bdfSaverEXG, bdfSaverEXGIMU

    if filename[-4:].lower() != ".bdf":
        filename += ".bdf"
    if self.__enable_imu:
        self._bdf_file = bdfSaverEXGIMU(
            filename,
            self.dev_args["channel_exg"],
            self.dev_args["fs_exg"],
            self.dev_args["channel_imu"],
            self.dev_args["fs_imu"],
            self.dev_args["type"],
        )
    else:
        self._bdf_file = bdfSaverEXG(
            filename,
            self.dev_args["channel_exg"],
            self.dev_args["fs_exg"],
            self.dev_args["type"],
        )
    self.__bdf_flag = True

find_devs() staticmethod

Find available eConAlpha devices.

Returns:

Type Description
list

available device ports.

Raises:

Type Description
Exception

if no eConAlpha device found.
Source code in src\eConEXG\eConAlpha\data_reader.py 
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@staticmethod
def find_devs() -> list:
    """
    Find available eConAlpha devices.

    Returns:
        available device ports.

    Raises:
        Exception: if no eConAlpha device found.
    """
    return sock.find_devs()

get_data(timeout=0.02)

Acquire all available data, make sure this function is called in a loop when with_q is set to True instart_acquisition_data()

Parameters:

Name Type Description Default
timeout Optional[float]

Non-negative value, blocks at most 'timeout' seconds and return, if set to None, blocks until new data available.

 0.02

Returns:

Type Description
Optional[list[Optional[list]]]

A list of frames, each frame is made up of 5 exg data and 1 imu data in a shape as below: [[exg_ch0_0,...,exg_ch8_0],..., [exg_ch0_7,...,exg_ch8_7], [acc_x, acc_y, acc_z,gry_x,gry_y,gry_z]], in which number 0~4 after _ indicates the time order of channel data.

Raises:

Type Description
Exception

if device not connected, connection failed, data transmission timeout/init failed, or unknown error.
Data Unit
  • exg: µV
  • acc: mg
  • gry: bps
Source code in src\eConEXG\eConAlpha\data_reader.py 
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def get_data(
    self, timeout: Optional[float] = 0.02
) -> Optional[list[Optional[list]]]:
    """
    Acquire all available data, make sure this function is called in a loop when `with_q` is set to `True` in`start_acquisition_data()`

    Args:
        timeout: Non-negative value, blocks at most 'timeout' seconds and return, if set to `None`, blocks until new data available.

    Returns:
        A list of frames, each frame is made up of 5 exg data and 1 imu data in a shape as below:
            [[`exg_ch0_0,...,exg_ch8_0`],..., [`exg_ch0_7,...,exg_ch8_7`], [`acc_x`, `acc_y`, `acc_z`,`gry_x`,`gry_y`,`gry_z`]],
                in which number `0~4` after `_` indicates the time order of channel data.

    Raises:
        Exception: if device not connected, connection failed, data transmission timeout/init failed, or unknown error.

    Data Unit:
        - exg: µV
        - acc: mg
        - gry: bps
    """
    self.__check_dev_status()
    if not self.__with_q:
        return
    try:
        data: list = self.__save_data.get(timeout=timeout)
    except queue.Empty:
        return []
    while not self.__save_data.empty():
        data.extend(self.__save_data.get())
    return data

get_dev_info()

Get current device information, including device name, hardware channel number, acquired channels, sample frequency, etc.

Returns:

Type Description
dict

A dictionary containing device information, which includes: type: hardware type; channel_exg: channel dictionary, including EXG channel index and name; channel_imu: channel dictionary, including IMU channel index and name; AdapterInfo: adapter used for connection; fs_exg: sample frequency of EXG in Hz; fs_imu: sample frequency of IMU in Hz;
Source code in src\eConEXG\eConAlpha\data_reader.py 
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def get_dev_info(self) -> dict:
    """
    Get current device information, including device name, hardware channel number, acquired channels, sample frequency, etc.

    Returns:
        A dictionary containing device information, which includes:
            `type`: hardware type;
            `channel_exg`: channel dictionary, including EXG channel index and name;
            `channel_imu`: channel dictionary, including IMU channel index and name;
            `AdapterInfo`: adapter used for connection;
            `fs_exg`: sample frequency of EXG in Hz;
            `fs_imu`: sample frequency of IMU in Hz;
    """
    return deepcopy(self.dev_args)

open_lsl_exg()

Open LSL EXG stream, can be invoked after start_acquisition_data().

Raises:

Type Description
Exception

if data acquisition not started or LSL stream already opened.
LSLException

if LSL stream creation failed.
importError

if pylsl is not installed or liblsl not installed for unix like system.
Source code in src\eConEXG\eConAlpha\data_reader.py 
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def open_lsl_exg(self):
    """
    Open LSL EXG stream, can be invoked after `start_acquisition_data()`.

    Raises:
        Exception: if data acquisition not started or LSL stream already opened.
        LSLException: if LSL stream creation failed.
        importError: if `pylsl` is not installed or liblsl not installed for unix like system.
    """
    if self.__status != eConAlpha.Dev.SIGNAL:
        raise Exception("Data acquisition not started, please start first.")
    if hasattr(self, "_lsl_exg"):
        raise Exception("LSL stream already opened.")
    from ..utils.lslWrapper import lslSender

    self._lsl_exg = lslSender(
        self.dev_args["channel_exg"],
        f"{self.dev_args['type']}EXG{self.dev_args['name'][-2:]}",
        "EXG",
        self.dev_args["fs_exg"],
        with_trigger=False,
    )
    self.__lsl_exg_flag = True

open_lsl_imu()

Open LSL IMU stream, can be invoked after start_acquisition_data().

Raises:

Type Description
Exception

if data acquisition not started or LSL stream already opened.
LSLException

if LSL stream creation failed.
importError

if pylsl is not installed or liblsl not installed for unix like system.
Source code in src\eConEXG\eConAlpha\data_reader.py 
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def open_lsl_imu(self):
    """
    Open LSL IMU stream, can be invoked after `start_acquisition_data()`.

    Raises:
        Exception: if data acquisition not started or LSL stream already opened.
        LSLException: if LSL stream creation failed.
        importError: if `pylsl` is not installed or liblsl not installed for unix like system.
    """
    if self.__status != eConAlpha.Dev.SIGNAL:
        raise Exception("Data acquisition not started, please start first.")
    if hasattr(self, "_lsl_imu"):
        raise Exception("LSL stream already opened.")
    from ..utils.lslWrapper import lslSender

    self._lsl_imu = lslSender(
        self.dev_args["channel_imu"],
        f"{self.dev_args['type']}IMU{self.dev_args['name'][-2:]}",
        "IMU",
        self.dev_args["fs_imu"],
        unit="degree",
        with_trigger=False,
    )
    self.__lsl_imu_flag = True

send_bdf_marker(marker)

Send marker to BDF file, can be invoked after create_bdf_file(), otherwise it will be ignored.

Parameters:

Name Type Description Default
marker str

marker string to write.

 required
Source code in src\eConEXG\eConAlpha\data_reader.py 
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def send_bdf_marker(self, marker: str):
    """
    Send marker to BDF file, can be invoked after `create_bdf_file()`, otherwise it will be ignored.

    Args:
        marker: marker string to write.
    """
    if hasattr(self, "_bdf_file"):
        self._bdf_file.write_Annotation(marker)

set_frequency(fs_exg=None)

Change the sampling frequency of eConAlpha.

Parameters:

Name Type Description Default
fs_exg Optional[int]

sampling frequency of exg data, should be 250, 500, 1000 or 2000. fs_imu will be automatically set to 1/8 of fs_exg.

 None

Raises:

Type Description
ValueError

if fs_exg is not valid.
NotImplementedError

device firmware too old, not supporting 500Hz.
Source code in src\eConEXG\eConAlpha\data_reader.py 
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def set_frequency(self, fs_exg: Optional[int] = None):
    """
    Change the sampling frequency of eConAlpha.

    Args:
        fs_exg: sampling frequency of exg data, should be 250, 500, 1000 or 2000.
            fs_imu will be automatically set to 1/8 of fs_exg.

    Raises:
        ValueError: if fs_exg is not valid.
        NotImplementedError: device firmware too old, not supporting 500Hz.
    """
    if self.__status == eConAlpha.Dev.SIGNAL:
        raise Exception("Data acquisition already started, please stop first.")
    if fs_exg is None:
        fs_exg = self.dev_args["fs_exg"]
    if fs_exg not in [250, 500, 1000, 2000]:
        raise ValueError("fs_exg should be 250, 500, 1000, or 2000")
    self.dev_args["fs_exg"] = fs_exg
    fs_imu = fs_exg / 8
    self.dev_args["fs_imu"] = fs_imu
    if hasattr(self, "dev"):
        self.dev.set_frequency(fs_exg)

shock_band()

Send a command to vibrate the arm band

Source code in src\eConEXG\eConAlpha\data_reader.py 
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def shock_band(self):
    """
    Send a command to vibrate the arm band
    """
    self.dev.shock_band()

start_acquisition_data(with_q=True)

Send data acquisition command to device, block until data acquisition started or failed.

Parameters:

Name Type Description Default
with_q bool

if True, signal data will be stored in a queue and should be acquired by calling get_data() in a loop in case data queue is full. if False, new data will not be directly available and can only be accessed through lsl stream.

 True
Source code in src\eConEXG\eConAlpha\data_reader.py 
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def start_acquisition_data(self, with_q: bool = True) -> None:
    """
    Send data acquisition command to device, block until data acquisition started or failed.

    Args:
        with_q: if True, signal data will be stored in a queue and **should** be acquired by calling `get_data()` in a loop in case data queue is full.
            if False, new data will not be directly available and can only be accessed through lsl stream.

    """
    self.__check_dev_status()
    self.__with_q = with_q
    if self.__status == eConAlpha.Dev.SIGNAL:
        return
    self.__status = eConAlpha.Dev.SIGNAL_START
    while self.__status not in [eConAlpha.Dev.SIGNAL, eConAlpha.Dev.TERMINATE]:
        time.sleep(0.01)
    self.__check_dev_status()

stop_acquisition()

Stop data or impedance acquisition, block until data acquisition stopped or failed.

Source code in src\eConEXG\eConAlpha\data_reader.py 
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def stop_acquisition(self) -> None:
    """
    Stop data or impedance acquisition, block until data acquisition stopped or failed.
    """
    self.__check_dev_status()
    self.__status = eConAlpha.Dev.IDLE_START
    while self.__status not in [eConAlpha.Dev.IDLE, eConAlpha.Dev.TERMINATE]:
        time.sleep(0.01)
    self.__check_dev_status()