def notifications(self, callback=None):
"""Toggle notifications/subscriptions to data signals
on the MetaWear board.
:param callable callback: The function to call when
data signal notification arrives. If ``None``, an
unsubscription to notifications is sent.
"""
data_signal = self.data_signal
if callback is not None:
if self._debug:
log.debug("Subscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
if self.callback is not None:
raise PyMetaWearException(
"Subscription to {0} signal already in place!")
self.callback = (callback, Fn_DataPtr(callback))
libmetawear.mbl_mw_datasignal_subscribe(data_signal,
self.callback[1])
else:
if self._debug:
log.debug("Unsubscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
if self.callback is None:
return
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
self.callback = None
def check_and_change_callback(self, data_signal, callback):
if callback is not None:
if self._debug:
log.debug("Subscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
if data_signal in self._callbacks:
raise PyMetaWearException(
"Subscription to {0} signal already in place!")
self._callbacks[data_signal] = (callback, Fn_DataPtr(callback))
libmetawear.mbl_mw_datasignal_subscribe(
data_signal, self._callbacks[data_signal][1])
else:
if data_signal not in self._callbacks:
return
if self._debug:
log.debug("Unsubscribing to {0} changes. (Sig#: {1})".format(
self.module_name, data_signal))
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
del self._callbacks[data_signal]
print("New client created: {0}".format(c))
def switch_callback(data):
if (data.contents.type_id == DataTypeId.UINT32):
data_ptr = cast(data.contents.value, POINTER(c_uint))
if data_ptr.contents.value == 1:
print("Switch pressed!")
elif data_ptr.contents.value == 0:
print("Switch released!")
else:
raise ValueError("Incorrect data returned.")
else:
raise RuntimeError('Incorrect data type id: ' +
str(data.contents.type_id))
# Subscribe
data_signal = libmetawear.mbl_mw_switch_get_state_data_signal(c.board)
fcn_dptr = Fn_DataPtr(switch_callback)
libmetawear.mbl_mw_datasignal_subscribe(data_signal, fcn_dptr)
time.sleep(10.0)
# Unsubscribe:
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
time.sleep(1.0)
c.disconnect()
address = select_device()
c = MetaWearClient(str(address), 'pygatt', debug=True)
print("New client created: {0}".format(c))
def _callback(data):
"""Handle a (x,y,z) gyroscope tuple."""
if data.contents.type_id == DataTypeId.CARTESIAN_FLOAT:
data_ptr = cast(data.contents.value, POINTER(CartesianFloat))
print("X: {0}, Y: {1}, Z: {2}".format(*(data_ptr.contents.x,
data_ptr.contents.y,
data_ptr.contents.z)))
else:
raise PyMetaWearException('Incorrect data type id: ' +
str(data.contents.type_id))
the_callback = Fn_DataPtr(_callback)
print("Set gyroscope settings...")
libmetawear.mbl_mw_gyro_bmi160_set_odr(c.board, 9)
libmetawear.mbl_mw_gyro_bmi160_set_range(c.board, 1)
print("Write gyroscope config....")
libmetawear.mbl_mw_gyro_bmi160_write_config(c.board)
print("Subscribing to gyroscope signal...")
data_signal = libmetawear.mbl_mw_gyro_bmi160_get_rotation_data_signal(c.board)
libmetawear.mbl_mw_datasignal_subscribe(data_signal, the_callback)
print("Enable gyro sampling on board...")
libmetawear.mbl_mw_gyro_bmi160_enable_rotation_sampling(c.board)
print("Start gyro on board...")
libmetawear.mbl_mw_gyro_bmi160_start(c.board)
def temperature_callback(data):
if data.contents.type_id == DataTypeId.FLOAT:
data_ptr = cast(data.contents.value, POINTER(c_float))
print("Temperature read: {0:.2f} C".format(data_ptr.contents.value))
else:
raise RuntimeError('Incorrect data type id: ' +
str(data.contents.type_id))
# On-Die temperature (channel 0) is always present.
channel = 0
# Subscribe to notifications
data_signal = libmetawear.mbl_mw_multi_chnl_temp_get_temperature_data_signal(
c.board, channel)
fcn_dptr = Fn_DataPtr(temperature_callback)
libmetawear.mbl_mw_datasignal_subscribe(data_signal, fcn_dptr)
for i in range(5):
libmetawear.mbl_mw_datasignal_read(data_signal)
time.sleep(1.0)
# Unsubscribe to notifications
libmetawear.mbl_mw_datasignal_unsubscribe(data_signal)
time.sleep(1.0)
c.disconnect()
address = select_device()
c = MetaWearClient(str(address), 'pygatt', debug=True)
print("New client created: {0}".format(c))
def acc_callback(data):
"""Handle a (x,y,z) accelerometer tuple."""
if data.contents.type_id == DataTypeId.CARTESIAN_FLOAT:
data_ptr = cast(data.contents.value, POINTER(CartesianFloat))
print("X: {0}, Y: {1}, Z: {2}".format(*(data_ptr.contents.x,
data_ptr.contents.y,
data_ptr.contents.z)))
else:
raise PyMetaWearException('Incorrect data type id: ' +
str(data.contents.type_id))
_acc_callback = Fn_DataPtr(acc_callback)
print("Write accelerometer settings...")
libmetawear.mbl_mw_acc_set_odr(c.board, c_float(50.0))
libmetawear.mbl_mw_acc_set_range(c.board, c_float(4.0))
print("Write accelerometer config....")
libmetawear.mbl_mw_acc_write_acceleration_config(c.board)
print("Subscribing to accelerometer signal...")
data_signal = libmetawear.mbl_mw_acc_get_acceleration_data_signal(c.board)
libmetawear.mbl_mw_datasignal_subscribe(data_signal, _acc_callback)
print("Enable acc sampling on board...")
libmetawear.mbl_mw_acc_enable_acceleration_sampling(c.board)
print("Start acc on board...")
libmetawear.mbl_mw_acc_start(c.board)