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    //! Minimal Cortex-M program
    //!
    //! When executed this program will hit the breakpoint set in `main`.
    //!
    //! All Cortex-M programs need to:
    //!
    //! - Contain the `#![no_main]` and `#![no_std]` attributes. Embedded programs don't use the
    //! standard Rust `main` interface or the Rust standard (`std`) library.
    //!
    //! - Define their entry point using [`entry!`] macro.
    //!
    //! [`entry!`]: https://docs.rs/cortex-m-rt/~0.5/cortex_m_rt/macro.entry.html
    //!
    //! - Define their panicking behavior, i.e. what happens when `panic!` is called. The easiest way to
    //! define a panicking behavior is to link to a [panic handler crate][0]
    //!
    //! [0]: https://crates.io/keywords/panic-impl
    //!
    //! - Define the `HardFault` handler using the [`exception!`] macro. This handler (function) is
    //! called when a hard fault exception is raised by the hardware.
    //!
    //! [`exception!`]: https://docs.rs/cortex-m-rt/~0.5/cortex_m_rt/macro..html
    //!
    //! - Define a default handler using the [`exception!`] macro. This function will be used to handle
    //! all interrupts and exceptions which have not been assigned a specific handler.
    //!
    //! ```
    //!
    //! #![no_main] // <- IMPORTANT!
    //! #![no_std]
    //!
    //! extern crate cortex_m;
    //!
    //! #[macro_use(entry, exception)]
    //! extern crate cortex_m_rt as rt;
    //!
    //! // makes `panic!` print messages to the host stderr using semihosting
    //! extern crate panic_semihosting;
    //!
    //! use cortex_m::asm;
    //! use rt::ExceptionFrame;
    //!
    //! // the program entry point is ...
    //! entry!(main);
    //!
    //! // ... this never ending function
    //! fn main() -> ! {
    //!     loop {
    //!         asm::bkpt();
    //!     }
    //! }
    //!
    //! // define the hard fault handler
    //! exception!(HardFault, hard_fault);
    //!
    //! fn hard_fault(ef: &ExceptionFrame) -> ! {
    //!     panic!("HardFault at {:#?}", ef);
    //! }
    //!
    //! // define the default exception handler
    //! exception!(*, default_handler);
    //!
    //! fn default_handler(irqn: i16) {
    //!     panic!("Unhandled exception (IRQn = {})", irqn);
    //! }
    //! ```
    // Auto-generated. Do not modify.

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