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//! Using a device crate
//!
//! Crates generated using [`svd2rust`] are referred to as device crates. These crates provides an
//! API to access the peripherals of a device. When you depend on one of these crates and the "rt"
//! feature is enabled you don't need link to the cortex-m-rt crate.
//!
//! [`svd2rust`]: https://crates.io/crates/svd2rust
//!
//! Device crates also provide an `interrupt!` macro 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 = "0.9.0"
//! ```
//!
//! ---
//!
//! ```
//!
//! #![deny(warnings)]
//! #![feature(const_fn)]
//! #![no_std]
//!
//! extern crate cortex_m;
//! // extern crate cortex_m_rt; // included in the device crate
//! extern crate cortex_m_semihosting;
//! #[macro_use(exception, interrupt)]
//! extern crate stm32f103xx;
//! extern crate panic_abort; // panicking behavior
//!
//! use core::cell::RefCell;
//! use core::fmt::Write;
//!
//! use cortex_m::interrupt::{self, Mutex};
//! use cortex_m::peripheral::syst::SystClkSource;
//! use cortex_m_semihosting::hio::{self, HStdout};
//! use stm32f103xx::Interrupt;
//!
//! static HSTDOUT: Mutex<RefCell<Option<HStdout>>> = Mutex::new(RefCell::new(None));
//!
//! static NVIC: Mutex<RefCell<Option<cortex_m::peripheral::NVIC>>> = Mutex::new(RefCell::new(None));
//!
//! fn main() {
//! let global_p = cortex_m::Peripherals::take().unwrap();
//! interrupt::free(|cs| {
//! let hstdout = HSTDOUT.borrow(cs);
//! if let Ok(fd) = hio::hstdout() {
//! *hstdout.borrow_mut() = Some(fd);
//! }
//!
//! let mut nvic = global_p.NVIC;
//! nvic.enable(Interrupt::TIM2);
//! *NVIC.borrow(cs).borrow_mut() = Some(nvic);
//!
//! let mut syst = global_p.SYST;
//! syst.set_clock_source(SystClkSource::Core);
//! syst.set_reload(8_000_000); // 1s
//! syst.enable_counter();
//! syst.enable_interrupt();
//! });
//! }
//!
//! exception!(SYS_TICK, tick);
//!
//! fn tick() {
//! interrupt::free(|cs| {
//! let hstdout = HSTDOUT.borrow(cs);
//! if let Some(hstdout) = hstdout.borrow_mut().as_mut() {
//! writeln!(*hstdout, "Tick").ok();
//! }
//!
//! if let Some(nvic) = NVIC.borrow(cs).borrow_mut().as_mut() {
//! nvic.set_pending(Interrupt::TIM2);
//! }
//! });
//! }
//!
//! interrupt!(TIM2, tock, locals: {
//! tocks: u32 = 0;
//! });
//!
//! fn tock(l: &mut TIM2::Locals) {
//! l.tocks += 1;
//!
//! interrupt::free(|cs| {
//! let hstdout = HSTDOUT.borrow(cs);
//! if let Some(hstdout) = hstdout.borrow_mut().as_mut() {
//! writeln!(*hstdout, "Tock ({})", l.tocks).ok();
//! }
//! });
//! }
//! ```
// Auto-generated. Do not modify.