Asynchronous Lightflashing on LoPy

lightshow_async.py

class FlashAsyncToken(AbortToken):
    def __init__(self, color, times=1, time_on=0.1, time_off=0.1, abort_token=None):
        super().__init__()
        self.color = color
        self.counter = 0
        self.times = times
        self.time_on = time_on
        self.time_off = time_off
        self.parent = abort_token
        self.__alarm = Timer.Alarm(self.__light_on, us=5, periodic=False)
    def is_abort_requested(self):
        if self.parent is not None:
            return self.parent.is_abort_requested()
        return super().is_abort_requested()
    def __light_on(self, alarm=None):
        pycom.heartbeat(False)
        pycom.rgbled(self.color)
        self.__alarm = Timer.Alarm(self.__light_off, s=self.time_on, periodic=False)
    def __light_off(self, alarm=None):
        pycom.heartbeat(False)
        pycom.rgbled(0)
        self.__alarm = Timer.Alarm(self.__counter_inc, s=self.time_off, periodic=False)
    def __counter_inc(self, alarm=None):
        self.counter += 1
        if self.counter < self.times and not self.is_abort_requested():
            self.__light_on()
def flash_rgbled_async(color, times=1, time_on=0.1, time_off=0.1, abort_token=None):
    return FlashAsyncToken(color, times=times, time_on=time_on, time_off=time_off, abort_token=abort_token)