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from periphery import Serial
import threading
import time

def uart3_task():
    uart3 = Serial(
        "/dev/ttyS3",
        baudrate=115200,
        databits=8,
        parity="none",
        stopbits=1,
        xonxoff=False,
        rtscts=False,
    )

    # Send messages from UART3
    print("UART3 starts working!")
    msg = b"START, PLEASE!\n"

    while True:
        # Continuously send messages until response received from UART4
        uart3.write(msg)
        print(f"UART3 sent: {msg}!")

        time.sleep(0.5)  # Sleep for 1 second between messages

        # Check if response received from UART4
        buf = uart3.read(128, 1)  # Set timeout to 1 second
        print(f"UART3 receive: {buf}")
        if buf:
            data_string = buf.decode("utf-8").strip()
            if data_string == "Response from UART4!":
                print("UART3 received response from UART4:", data_string)
                break  # Break out of loop if response received

    uart3.close()

def uart4_task():
    uart4 = Serial(
        "/dev/ttyS4",
        baudrate=115200,
        databits=8,
        parity="none",
        stopbits=1,
        xonxoff=False,
        rtscts=False,
    )
    print("UART4 starts working!")
    while True:
        # Wait for message from UART3
        buf = uart4.read(128, 5)  # Set timeout to 1 second
        print(f"UART4 received: {buf}")
        if buf:
            data_string = buf.decode("utf-8").strip()
            print("UART4 received:", data_string)

            # Send response from UART4
            uart4.write(b"Response from UART4!\n")
            print("UART4 sent: Response from UART4!")

    uart4.close()

# Create and start threads for UART tasks
thread_uart3 = threading.Thread(target=uart3_task)
thread_uart4 = threading.Thread(target=uart4_task)

thread_uart3.start()
thread_uart4.start()

# Wait for threads to finish
thread_uart3.join()
thread_uart4.join()

Code: Select all

# python uart.py
UART3 starts working!
UART3 sent: b'START, PLEASE!\n'!
UART4 starts working!
UART3 receive: b''
UART3 sent: b'START, PLEASE!\n'!
UART3 receive: b''
UART3 sent: b'START, PLEASE!\n'!
UART3 receive: b''
UART3 sent: b'START, PLEASE!\n'!
UART4 received: b''
UART3 receive: b''
UART3 sent: b'START, PLEASE!\n'!
UART3 receive: b''
UART3 sent: b'START, PLEASE!\n'!
UART3 receive: b''
UART3 sent: b'START, PLEASE!\n'!
UART4 received: b''