def run_inner(self):
"""Perform one on/off/blink pulse."""
try:
item = self.blink_command_queue.get(block=True, timeout=self.blink_duration)
self.blinking = item[0]
if self.blinking:
# Always begin opposite of current state for immediate visual feedback
GPIO.output(self.output_pin, not GPIO.input(self.output_pin))
# Calculate number of remaining on/off blink toggles after this one
# A zero count means to keep blinking indefinitely
self.blink_count = item[1] * 2 - 1 if item[1] else 0
else:
# Remember last non-blinking state of the light which will be restored
# after finite blink count has completed.
self.steady_state = item[1]
GPIO.output(self.output_pin, item[1])
except queue.Empty:
if self.blinking:
# If blinking a finite number of times, count each on/off transition
if self.blink_count > 0:
self.blink_count -= 1
if self.blink_count == 0:
# Ensure at the end of finite blink count we always return to
# the last on/off steady state, even if a new blink was started
# before a previous blink has finished.
GPIO.output(self.output_pin, self.steady_state)
self.blinking = False
# Toggle output if blinking indefinitely or finite count not exhausted
if self.blinking:
# When blinking, invert every timeout expiration (we might have woken
# up for some other reason, but this appears to work in practice).
GPIO.output(self.output_pin, not GPIO.input(self.output_pin))
def run_inner(self):
"""Perform one on/off/blink pulse."""
try:
item = self.blink_command_queue.get(block=True, timeout=self.blink_duration)
self.blinking = item[0]
if self.blinking:
# Always begin on; always turn off when disabling
GPIO.output(self.output_pin, True)
else:
GPIO.output(self.output_pin, item[1])
except Queue.Empty:
if self.blinking:
# When blinking, invert every timeout expiration (we might have woken
# up for some other reason, but this appears to work in practice).
GPIO.output(self.output_pin, not GPIO.input(self.output_pin))