Adding a second serial UART

main.rs

#[entry]
fn main() -> ! {
    let mut peripherals = Peripherals::take().unwrap();
    let mut core = CorePeripherals::take().unwrap();
    let mut clocks = GenericClockController::with_internal_32kosc(
        peripherals.GCLK,
        &mut peripherals.PM,
        &mut peripherals.SYSCTRL,
        &mut peripherals.NVMCTRL,
    );

    let mut pins = arduino_mkrzero::Pins::new(peripherals.PORT);
    let gclk0 = clocks.gclk0().clone();

    let rx_pin = pins.rx.into_pull_down_input(&mut pins.port).into_pad(&mut pins.port);
    let tx_pin = pins.tx.into_push_pull_output(&mut pins.port).into_pad(&mut pins.port);
    let mut serial = UART5::new(
        &clocks.sercom5_core(&gclk0).unwrap(),
        9600.hz(),
        peripherals.SERCOM5,
        &mut core.NVIC,
        &mut peripherals.PM,
        UART5Pinout::Rx3Tx2 {rx: rx_pin, tx: tx_pin},
    );

    serial.write_str("Initialised\n").unwrap();

    let gclk1 = clocks.gclk1().clone(); // Tried gclk0 and gclk1 here
    let gps_rx_pin: sercom::Sercom0Pad1 = pins.scl.into_pull_down_input(&mut pins.port).into_pad(&mut pins.port);
    let gps_tx_pin: sercom::Sercom0Pad0 = pins.sda.into_push_pull_output(&mut pins.port).into_pad(&mut pins.port);
    // Commenting out the below block makes it work every time
    let mut gps_serial = sercom::UART0::new(
        &clocks.sercom0_core(&gclk1).unwrap(),
        9600.hz(),
        peripherals.SERCOM0,
        &mut core.NVIC,
        &mut peripherals.PM,
        sercom::UART0Pinout::Rx1Tx0 {
            rx: gps_rx_pin,
            tx: gps_tx_pin,
        },
    );

    // Sometimes passs this line, mostly it's just partially output i.e. "GPS I" before halting.
    serial.write_str("GPS Initialised\n").unwrap();

    serial.write_str("\n").unwrap();

    loop {}
}