Blocking UART read or readline without timeout

[alvv-z]

Is there a way to disable the timeout of these two methods? I am planning to have the pico only do something (including mirroring to another UART) as a reaction to serial input, so a kind of half duplex communication, if you can call it that.

[GitHubsSilverBullet]

uart = machine.UART(0,9600,timeout=int(2**31-1))

>>> int(2**31-1) / 1000 / 86400
24.85514 days

If that's not enough, use a while True: loop and exit when read returns anything else than None.

[alvv-z]

I was thinking about using something like this, but It just feels dirty somehow 😬 if you know what I mean. Thank you for the help though

[sosi-deadeye]

Use asyncio. await streamreader.readline() has no timeout.

import asyncio

from asyncio import StreamReader
from machine import UART


async def readlines(uart):
    sr = StreamReader(uart)
    while True:
        # waits until a line is available, otherwise no progress
        print(await sr.readline())


async def readlines_info(uart, timeout=5):
    sr = StreamReader(uart)
    while True:
        try:
            # to get a timeout, you have to write extra code for it
            line = await asyncio.wait_for(sr.readline(), timeout)
        except asyncio.TimeoutError:
            print("No data received yet")
        else:
            print(line)


if __name__ == "__main__":
    u0 = UART(1, 9600)
    asyncio.run(readlines_info(u0))