def add_event_callback(channel, callback):
ch_info = _channel_to_info(channel, need_gpio=True)
if not callable(callback):
raise TypeError("Parameter must be callable")
if _app_channel_configuration(ch_info) != IN:
raise RuntimeError("You must setup() the GPIO channel as an "
"input first")
if not event.gpio_event_added(ch_info.gpio):
raise RuntimeError("Add event detection using add_event_detect first "
"before adding a callback")
event.add_edge_callback(ch_info.gpio, lambda: callback(channel))
def add_event_callback(channel, callback):
if not callable(callback):
raise TypeError("Parameter must be callable")
gpio = _get_gpio_number(channel)
if _check_pin_setup(gpio) != IN:
raise RuntimeError("You must setup() the GPIO channel as an "
"input first")
if not event.gpio_event_added(gpio):
raise RuntimeError("Add event detection using add_event_detect first "
"before adding a callback")
event.add_edge_callback(gpio, lambda: callback(channel))
def add_event_detect(channel, edge, callback=None, bouncetime=None):
result = None
if (not callable(callback)) and callback is not None:
raise TypeError("Callback Parameter must be callable")
gpio = _get_gpio_number(channel)
# channel must be setup as input
if _check_pin_setup(gpio) != IN:
raise RuntimeError("You must setup() the GPIO channel as an input "
"first")
# edge must be rising, falling or both
if edge != RISING and edge != FALLING and edge != BOTH:
raise ValueError("The edge must be set to RISING, FALLING, or BOTH")
# if bouncetime is provided, it must be int and greater than 0
if bouncetime is not None:
if type(bouncetime) != int:
raise TypeError("bouncetime must be an integer")
elif bouncetime < 0:
raise ValueError("bouncetime must be an integer greater than 0")
result = event.add_edge_detect(gpio, edge + _EDGE_OFFSET, bouncetime)
# result == 1 means a different edge was already added for the channel.
# result == 2 means error occurred while adding edge (thread or event poll)
if result:
error_str = None
if result == 1:
error_str = "Conflicting edge already enabled for this GPIO channel"
else:
error_str = "Failed to add edge detection"
raise RuntimeError(error_str)
if callback is not None:
event.add_edge_callback(gpio, lambda: callback(channel))