def add_event(self,
port_number,
on_rising_callback=None,
on_falling_callback=None):
"""Adds listening event on given port.
In this case 2nd argument passed to a callback is a value read
during callback invocation, which in theory might not be the one
that actually cause triggering the event.
"""
if Settings.IS_NO_HARDWARE_MODE:
logging.warning('No hardware mode, adding read event failed.')
else:
port_listener = self._port_listeners.get(port_number)
if not port_listener:
port_listener = _PiPortListener(self.get_port(port_number))
gpio = get_gpio()
gpio.add_event_detect(port_number,
gpio.BOTH,
callback=port_listener.trigger_callbacks,
bouncetime=Settings.READ_SWITCH_DEBOUNCE)
self._port_listeners[port_number] = port_listener
if on_rising_callback:
logging.debug(
'Adding rising callback for interface (%s) on port %d',
self, port_number)
port_listener.add_rising_callback(on_rising_callback)
if on_falling_callback:
logging.debug(
'Adding falling callback for interface (%s) on port %d',
self, port_number)
port_listener.add_falling_callback(on_falling_callback)
def _gpio_output(self, port_number, value):
self._validate_port_number(port_number)
if Settings.IS_NO_HARDWARE_MODE:
logging.warning('No hardware mode, no value written')
else:
gpio = get_gpio()
gpio.output(port_number,
gpio.HIGH if value == self.HIGH else gpio.LOW)
def get_value(self, port_number):
self._validate_port_number(port_number)
value = self._check_no_hardware_port_value(port_number)
if value is not None:
return value
else:
gpio = get_gpio()
value = gpio.input(port_number)
# logging.debug(
# 'Read gpio port value (%s): %s',
# self.get_port(port_number),
# value)
return self.HIGH if value == gpio.HIGH else self.LOW
def _gpio_setup(self, port_number, gpio_attr_name):
self._validate_port_number(port_number)
if Settings.IS_NO_HARDWARE_MODE:
logging.warning('No hardware mode, no value written')
else:
gpio = get_gpio()
if gpio_attr_name == 'IN':
# Special case for settings port as input.
# Pullup or pulldown rezistor should be set here.
kwargs = {}
if self.pull_up_down_rezistor == self.PULL_UP:
kwargs['pull_up_down'] = gpio.PUD_UP
elif self.pull_up_down_rezistor == self.PULL_DOWN:
kwargs['pull_up_down'] = gpio.PUD_DOWN
gpio.setup(port_number, getattr(gpio, gpio_attr_name),
**kwargs)
else:
gpio.setup(port_number, getattr(gpio, gpio_attr_name))
def clear_read_events(self, port_number):
if not Settings.IS_NO_HARDWARE_MODE:
get_gpio().remove_event_detect(port_number)
if port_number in self._port_listeners:
del self._port_listeners[port_number]