import uasyncio as asyncio
import machine

class LED():
    def __init__(self, pin):
        self.pin = machine.Pin(pin,machine.Pin.OUT)
        self.rate = 0
        loop = asyncio.get_event_loop()
        loop.create_task(self._update_async())

    async def _update_async(self):
        while True:
            if self.rate <= 0:
                await asyncio.sleep_ms(200)
            else:
                self.toggle()
                await asyncio.sleep_ms(int(500 / self.rate))

    def toggle(self):
        self.pin.value(not self.pin.value())

    def flash(self, rate):
        """rate:\t flashing speed in Herz"""
        self.rate = rate

    def on(self,overwriteFlashing=True):
        self.pin.on()
        if overwriteFlashing:
            self.rate = 0

    def off(self,overwriteFlashing=True):
        self.pin.off()
        if overwriteFlashing:
            self.rate = 0

    def value(self,value=None):
        if value!=None:
            self.pin.value(value)
        return self.pin.value()