v0.2.0

src/examples/_4_override_exception_handler.rs

@@ -0,0 +1,51 @@
+//! Overriding an exception handler
+//!
+//! You can override an exception handler using the [`exception!`][1] macro.
+//!
+//! [1]: https://docs.rs/cortex-m-rt/0.3.2/cortex_m_rt/macro.exception.html
+//!
+//! The default exception handler can be overridden using the
+//! [`default_handler!`][2] macro
+//!
+//! [2]: https://docs.rs/cortex-m-rt/0.3.2/cortex_m_rt/macro.default_handler.html
+//!
+//! ---
+//!
+//! ```
+//! 
+//! #![feature(used)]
+//! #![no_std]
+//! 
+//! extern crate cortex_m;
+//! #[macro_use(exception)]
+//! extern crate cortex_m_rt;
+//! 
+//! use core::ptr;
+//! 
+//! use cortex_m::asm;
+//! 
+//! fn main() {
+//!     unsafe {
+//!         // Invalid memory access
+//!         ptr::read_volatile(0x2FFF_FFFF as *const u32);
+//!     }
+//! }
+//! 
+//! exception!(HARD_FAULT, handler);
+//! 
+//! fn handler() {
+//!     // You'll hit this breakpoint rather than the one in cortex-m-rt
+//!     asm::bkpt()
+//! }
+//! 
+//! // As we are not using interrupts, we just register a dummy catch all handler
+//! #[allow(dead_code)]
+//! #[used]
+//! #[link_section = ".vector_table.interrupts"]
+//! static INTERRUPTS: [extern "C" fn(); 240] = [default_handler; 240];
+//! 
+//! extern "C" fn default_handler() {
+//!     asm::bkpt();
+//! }
+//! ```
+// Auto-generated. Do not modify.