CircuitPython version

Tested with CP 8.0.2 and CP 20230218-12d3640.

Code works properly with CP 7.3.3.

Code/REPL

import time
import board
import busio

e5_uart = busio.UART(
    board.TX, board.RX,
    baudrate=9600,
    timeout=0.01
)

while True:
    out_bytes = bytes('From QT Py\n\r', 'utf-8')
    e5_uart.write(out_bytes)
    in_bytes = e5_uart.read(10)
    if in_bytes:
        print(in_bytes)

    time.sleep(1)

Behavior

I have the QT Py Tx and Rx pins connected to a USB-TTL serial converter connected to my Linux PC. For CP 8.x versions, no characters are received on the PC. When I send characters from the PC to the USB-TTL converter, the QT Py does properly receive them, as indicated by characters being printed on the QT Py Serial console.

The above code works properly with CP 7.3.3.

Description

No response

Additional information

No response