from machine import UART, Pin
import time

# Initialize UART (hardware UART on GP4 (TX) and GP5 (RX))
uart = UART(1, baudrate=115200, tx=Pin(4), rx=Pin(5))

# USB Serial (CDC) is already enabled by default in MicroPython
# You can use `sys.stdin` and `sys.stdout` for USB communication

while True:
    # Check if data is available on UART
    if uart.any():
        uart_data = uart.read()  # Read data from UART
        print(uart_data.decode('utf-8'), end='')  # Send UART data to USB (print to console)

    # Check if data is available on USB (virtual COM port)
    if sys.stdin.any():
        usb_data = sys.stdin.read()  # Read data from USB
        uart.write(usb_data)  # Send USB data to UART

    time.sleep(0.01)  # Small delay to avoid busy-waiting