Before I start an issue on github, just wanted to know, if I am doing smth wrong. This basic example should start a loop and after one calls the stop method it should stop. However, the print("while loop") gets not executed at all.
import uasyncio
import utime
class Test:
def __init__(self):
pass
def run_loop(self):
self.should_run = 1
uasyncio.create_task(self._while_loop())
async def _while_loop(self):
print("while loop") # <--------- gets never called!
counter = 0
while self.should_run == 1:
counter += 1
print(counter)
await uasyncio.sleep_ms(100)
def stop(self):
self.should_run = 0
print("should stop now")
test = Test()
test.run_loop()
print("looop started.. wait..")
utime.sleep(3)
print("...waited..")
test.stop()
In a python script all executions are sync by default. To provide async functionality one has to create an async context. this is done via asyncio.run() // which will wait due to pythons nature till all inner async tasks are terminated.
As the micropython-uasyncio docs says, a typical async application is wrapped into the async context (e.g. main function).
This is how I solved the problem above:
import uasyncio as asyncio
import utime
class Test:
run = 0
def __init__(self):
pass
def run_loop(self):
self.run = 1
asyncio.create_task(self._while_loop())
async def _while_loop(self):
print("while loop, should_run:", self.run)
counter = 0
while self.run == 1:
counter += 1
print(counter)
await asyncio.sleep_ms(100)
def stop(self):
self.run = 0
print("should stop now")
async def main():
test = Test()
test.run_loop()
print("looop started.. wait..")
await asyncio.sleep(2)
test.stop()
asyncio.run(main())