# message.py
# Copyright (c) 2018-2020 Peter Hinch
# Released under the MIT License (MIT) - see LICENSE file
try:
import uasyncio as asyncio
except ImportError:
import asyncio
# Usage:
# from primitives.message import Message
# A coro waiting on a message issues await message
# A coro rasing the message issues message.set(payload)
# When all waiting coros have run
# message.clear() should be issued
# This more efficient version is commented out because Event.set is not ISR
# friendly. TODO If it gets fixed, reinstate this (tested) version.
#class Message(asyncio.Event):
#def __init__(self, _=0):
#self._data = None
#super().__init__()
#def clear(self):
#self._data = None
#super().clear()
#def __await__(self):
#await super().wait()
#__iter__ = __await__
#def set(self, data=None):
#self._data = data
#super().set()
#def value(self):
#return self._data
# Has an ISR-friendly .set()
class Message():
def __init__(self, delay_ms=0):
self.delay_ms = delay_ms
self.clear()
def clear(self):
self._flag = False
self._data = None
async def wait(self): # CPython comptaibility
while not self._flag:
await asyncio.sleep_ms(self.delay_ms)
def __await__(self):
while not self._flag:
await asyncio.sleep_ms(self.delay_ms)
__iter__ = __await__
def is_set(self):
return self._flag
def set(self, data=None):
self._flag = True
self._data = data
def value(self):
return self._data
