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//! Overriding an exception handler
//!
//! You can override an exception handler using the [`exception!`][1] macro.
//!
//! [1]: https://docs.rs/cortex-m-rt/0.5.0/cortex_m_rt/macro.exception.html
//!
//! ---
//!
//! ```
//!
//! #![deny(unsafe_code)]
//! #![no_main]
//! #![no_std]
//!
//! extern crate cortex_m;
//! #[macro_use]
//! extern crate cortex_m_rt as rt;
//! extern crate cortex_m_semihosting as sh;
//! extern crate panic_semihosting;
//!
//! use core::fmt::Write;
//!
//! use cortex_m::peripheral::syst::SystClkSource;
//! use cortex_m::Peripherals;
//! use rt::ExceptionFrame;
//! use sh::hio::{self, HStdout};
//!
//! entry!(main);
//!
//! fn main() -> ! {
//!     let p = Peripherals::take().unwrap();
//!     let mut syst = p.SYST;
//!
//!     // configures the system timer to trigger a SysTick exception every second
//!     syst.set_clock_source(SystClkSource::Core);
//!     syst.set_reload(8_000_000); // period = 1s
//!     syst.enable_counter();
//!     syst.enable_interrupt();
//!
//!     loop {}
//! }
//!
//! // try commenting out this line: you'll end in `default_handler` instead of in `sys_tick`
//! exception!(SysTick, sys_tick, state: Option<HStdout> = None);
//!
//! fn sys_tick(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.