// UART loopback for testing the BL616 bridge: everything the PC sends to the
// serial port comes straight back, at any baud rate / format.
module loopback (
    input  wire uart_rx, // B3, driven by BL616 GPIO11 (TX)
    output wire uart_tx  // C3, read by BL616 GPIO10 (RX)
);
    assign uart_tx = uart_rx;
endmodule