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    //! Using a device crate
    //!
    //! Crates generated using [`svd2rust`] are referred to as device crates. These crates provide an
    //! API to access the peripherals of a device.
    //!
    //! [`svd2rust`]: https://crates.io/crates/svd2rust
    //!
    //! Device crates also provide an `interrupt!` macro (behind the "rt" feature) to register interrupt
    //! handlers.
    //!
    //! This example depends on the [`stm32f103xx`] crate so you'll have to add it to your Cargo.toml.
    //!
    //! [`stm32f103xx`]: https://crates.io/crates/stm32f103xx
    //!
    //! ```
    //! $ edit Cargo.toml && tail $_
    //! [dependencies.stm32f103xx]
    //! features = ["rt"]
    //! version = "0.10.0"
    //! ```
    //!
    //! ---
    //!
    //! ```
    //!
    //! #![no_main]
    //! #![no_std]
    //!
    //! extern crate cortex_m;
    //! #[macro_use]
    //! extern crate cortex_m_rt as rt;
    //! extern crate cortex_m_semihosting as sh;
    //! #[macro_use]
    //! extern crate stm32f103xx;
    //! extern crate panic_semihosting;
    //!
    //! use core::fmt::Write;
    //!
    //! use cortex_m::peripheral::syst::SystClkSource;
    //! use rt::ExceptionFrame;
    //! use sh::hio::{self, HStdout};
    //! use stm32f103xx::Interrupt;
    //!
    //! entry!(main);
    //!
    //! fn main() -> ! {
    //!     let p = cortex_m::Peripherals::take().unwrap();
    //!
    //!     let mut syst = p.SYST;
    //!     let mut nvic = p.NVIC;
    //!
    //!     nvic.enable(Interrupt::EXTI0);
    //!
    //!     // configure the system timer to wrap around every second
    //!     syst.set_clock_source(SystClkSource::Core);
    //!     syst.set_reload(8_000_000); // 1s
    //!     syst.enable_counter();
    //!
    //!     loop {
    //!         // busy wait until the timer wraps around
    //!         while !syst.has_wrapped() {}
    //!
    //!         // trigger the `EXTI0` interrupt
    //!         nvic.set_pending(Interrupt::EXTI0);
    //!     }
    //! }
    //!
    //! // try commenting out this line: you'll end in `default_handler` instead of in `exti0`
    //! interrupt!(EXTI0, exti0, state: Option<HStdout> = None);
    //!
    //! fn exti0(state: &mut Option<HStdout>) {
    //!     if state.is_none() {
    //!         *state = Some(hio::hstdout().unwrap());
    //!     }
    //!
    //!     if let Some(hstdout) = state.as_mut() {
    //!         hstdout.write_str(".").unwrap();
    //!     }
    //! }
    //!
    //! exception!(HardFault, hard_fault);
    //!
    //! fn hard_fault(ef: &ExceptionFrame) -> ! {
    //!     panic!("HardFault at {:#?}", ef);
    //! }
    //!
    //! exception!(*, default_handler);
    //!
    //! fn default_handler(irqn: i16) {
    //!     panic!("Unhandled exception (IRQn = {})", irqn);
    //! }
    //! ```
    // Auto-generated. Do not modify.

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