using serial port in python3 asyncio

Question

i\'m trying and, so far, failing to use python asyncio to access a serial port.

i\'d really appreciate any tips on using the new python async framework on a simple fd.

Answer 1

Another option is to write all your serial stuff with blocking calls, then run it in a different thread with run_in_executor:

import asyncio
import concurrent

from serial import Serial

# Normal serial blocking reads
# This could also do any processing required on the data
def get_byte():
    return s.read(1)

# Runs blocking function in executor, yielding the result
@asyncio.coroutine
def get_byte_async():
    with concurrent.futures.ThreadPoolExecutor(max_workers=1) as executor:
        res = yield from loop.run_in_executor(executor, get_byte)
        return res

def get_and_print():
    b = yield from get_byte_async()
    print (b)

s = Serial("COM11", 19200, timeout=10)
loop = asyncio.get_event_loop()
loop.run_until_complete(get_and_print())