f3 0.6.1

Board Support Crate for the STM32F3DISCOVERY
Documentation 
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//! Sends "Hello, world!" through the first ITM stimulus port
//!
//! To receive the message on the host you'll have to do three things:
//!
//! You'll need to uncomment lines 8 and 15 of the `.gdbinit` file.
//!
//! You'll also need to connect the SWO pin of the on-board SWD programmer to pin PB3 as shown
//! [here](https://japaric.github.io/discovery/06-hello-world/README.html).
//!
//! Finally, you'll need to run `itmdump itm.fifo` (mind the file paths) to receive the message.
//! Read the documentation of the [`itm`] crate, which provides the `itmdump` tool,  for details.
//!
//! [`itm`]: https://docs.rs/itm/0.2.0/itm/
#![deny(unsafe_code)]
#![deny(warnings)]
#![no_main]
#![no_std]

#[macro_use]
extern crate cortex_m;
extern crate f3;
extern crate panic_semihosting;
#[macro_use(entry, exception)]
extern crate cortex_m_rt as rt;

use cortex_m::asm;
use rt::ExceptionFrame;

entry!(main);

fn main() -> ! {
    let p = cortex_m::Peripherals::take().unwrap();
    let mut itm = p.ITM;

    iprintln!(&mut itm.stim[0], "Hello, world!");

    asm::bkpt();

    loop {}
}

exception!(HardFault, hard_fault);

fn hard_fault(ef: &ExceptionFrame) -> ! {
    panic!("{:#?}", ef);
}

exception!(*, default_handler);

fn default_handler(irqn: i16) {
    panic!("Unhandled exception (IRQn = {})", irqn);
}