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// Works, but I have multiple ports.../pins
        let mut sw1 = gpioc.pc4.into_pull_up_input(&mut gpioc.moder, &mut gpioc.pupdr);
        let mut sw2 = gpiod.pd0.into_pull_up_input(&mut gpiod.moder, &mut gpiod.pupdr);
        let mut sw3 = gpiod.pd1.into_pull_up_input(&mut gpiod.moder, &mut gpiod.pupdr);

        sw1.make_interrupt_source(&mut dp.SYSCFG);
        sw1.enable_interrupt(&mut dp.EXTI);
        sw1.trigger_on_edge(&mut dp.EXTI, Edge::Falling);
        sw2.make_interrupt_source(&mut dp.SYSCFG);
        sw2.enable_interrupt(&mut dp.EXTI);
        sw2.trigger_on_edge(&mut dp.EXTI, Edge::Falling);
        sw3.make_interrupt_source(&mut dp.SYSCFG);
        sw3.enable_interrupt(&mut dp.EXTI);
        sw3.trigger_on_edge(&mut dp.EXTI, Edge::Falling);

        unsafe {
            NVIC::unmask(pac::Interrupt::EXTI0);
            NVIC::unmask(pac::Interrupt::EXTI1);
            NVIC::unmask(pac::Interrupt::EXTI4);
        }

// Can't work, because I the GpioExt:: Parts is a type within the _port_ not gpio as a top level?


        let sw1 = setup_button(gpioc, gpioc.pc4, stm32::Interrupt::EXTI4, &mut dp.SYSCFG, &mut dp.EXTI);
        let sw2 = setup_button(gpiod, gpiod.pd0, stm32::Interrupt::EXTI0, &mut dp.SYSCFG, &mut dp.EXTI);
        let sw3 = setup_button(gpiod, gpiod.pd1, stm32::Interrupt::EXTI1, &mut dp.SYSCFG, &mut dp.EXTI);

// Can't even use a function per port, because we can't pass the right type for the ping?
    fn setup_button_C<E>(port: &mut hal::gpio::gpioc::Parts, &mut pin: hal::gpio::gpioc::PCx<InputPin<Error=E>>, nvic: stm32::Interrupt, syscfg: &mut SYSCFG, exti: &mut EXTI)  {
        let mut sw = pin.into_pull_up_input(&mut port.moder, &mut port.pupdr);
        sw.make_interrupt_source(syscfg);
        sw.enable_interrupt(exti);
        sw.trigger_on_edge(exti, Edge::Falling);
        unsafe {
            NVIC::unmask(nvic);
        }
        sw
    }