69 lines
1.7 KiB
Rust
69 lines
1.7 KiB
Rust
//! Overriding an exception handler
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//!
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//! You can override an exception handler using the [`exception!`][1] macro.
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//!
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//! [1]: https://docs.rs/cortex-m-rt/0.5.0/cortex_m_rt/macro.exception.html
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//!
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//! ---
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//!
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//! ```
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//!
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//! #![deny(unsafe_code)]
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//! #![no_main]
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//! #![no_std]
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//!
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//! extern crate cortex_m;
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//! #[macro_use]
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//! extern crate cortex_m_rt as rt;
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//! extern crate cortex_m_semihosting as sh;
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//! extern crate panic_semihosting;
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//!
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//! use core::fmt::Write;
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//!
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//! use cortex_m::peripheral::syst::SystClkSource;
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//! use cortex_m::Peripherals;
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//! use rt::ExceptionFrame;
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//! use sh::hio::{self, HStdout};
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//!
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//! entry!(main);
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//!
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//! fn main() -> ! {
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//! let p = Peripherals::take().unwrap();
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//! let mut syst = p.SYST;
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//!
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//! // configures the system timer to trigger a SysTick exception every second
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//! syst.set_clock_source(SystClkSource::Core);
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//! syst.set_reload(8_000_000); // period = 1s
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//! syst.enable_counter();
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//! syst.enable_interrupt();
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//!
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//! loop {}
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//! }
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//!
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//! // try commenting out this line: you'll end in `default_handler` instead of in `sys_tick`
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//! exception!(SysTick, sys_tick, state: Option<HStdout> = None);
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//!
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//! fn sys_tick(state: &mut Option<HStdout>) {
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//! if state.is_none() {
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//! *state = Some(hio::hstdout().unwrap());
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//! }
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//!
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//! if let Some(hstdout) = state.as_mut() {
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//! hstdout.write_str(".").unwrap();
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//! }
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//! }
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//!
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//! exception!(HardFault, hard_fault);
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//!
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//! fn hard_fault(ef: &ExceptionFrame) -> ! {
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//! panic!("HardFault at {:#?}", ef);
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//! }
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//!
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//! exception!(*, default_handler);
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//!
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//! fn default_handler(irqn: i16) {
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//! panic!("Unhandled exception (IRQn = {})", irqn);
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//! }
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//! ```
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// Auto-generated. Do not modify.
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