ESP32 "uart event queue full" messages

[peterhinch]

The following script, run with a loopback connection:

import uasyncio as asyncio
import machine

uart=machine.UART(2,baudrate=9600, tx=14, rx=27)

async def sender():
    count = 0
    swriter = asyncio.StreamWriter(uart, {})
    while True:
        await swriter.awrite('Hello uart {:5d}\n'.format(count))
        await asyncio.sleep(2)
        count += 1

async def receiver():
    sreader = asyncio.StreamReader(uart)
    while True:
        res = await sreader.readline()
        print('Recieved', res)

loop = asyncio.get_event_loop()
loop.create_task(sender())
loop.create_task(receiver())
loop.run_forever()

produces this result:

MicroPython v1.9.3-521-gd6cf5c67 on 2018-04-08; ESP32 module with ESP32
Type "help()" for more information.
>>> import rats51
I (47174056) uart: queue free spaces: 10
Recieved b'Hello uart     0\n'
Recieved b'Hello uart     1\n'
Recieved b'Hello uart     2\n'
Recieved b'Hello uart     3\n'
Recieved b'Hello uart     4\n'
Recieved b'Hello uart     5\n'
Recieved b'Hello uart     6\n'
Recieved b'Hello uart     7\n'
Recieved b'Hello uart     8\n'
Recieved b'Hello uart     9\n'
W (47194136) uart: UART event queue full
Recieved b'Hello uart    10\n'
W (47196146) uart: UART event queue full
Recieved b'Hello uart    11\n'
[continues to run indefinitely with these messages]

This does not seem to affect the script's operation.

[dpgeorge]

Thanks for the report. I can confirm the error and have fixed it in 4ff05ae