# Simple uasyncio LED flasher

# Copyright 2018 David Zanetti

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

import uasyncio as asyncio

from asyn import Event

import pyb

class LED_Flashable():

def __init__(self, loop, led_no):

self.led = pyb.LED(led_no)

self.event = Event()

loop.create_task(self.flash_task())

def flash(self, period_ms):

if self.event.is_set():

return

self.event.set(period_ms)

async def flash_task(self):

while True:

await self.event

period_ms = self.event.value()

self.event.clear()

self.led.on()

await asyncio.sleep_ms(period_ms)

self.led.off()