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//! A LED roulette!
//!
//! ```
//! #![deny(unsafe_code)]
//! #![deny(warnings)]
//! #![no_std]
//! #![no_main]
//!
//! #[macro_use(entry, exception)]
//! extern crate cortex_m_rt as rt;
//! extern crate cortex_m;
//! extern crate f3;
//! extern crate panic_semihosting;
//!
//! use f3::hal::delay::Delay;
//! use f3::hal::prelude::*;
//! use f3::hal::stm32f30x;
//! use f3::led::Leds;
//! use rt::ExceptionFrame;
//!
//! entry!(main);
//!
//! fn main() -> ! {
//! let cp = cortex_m::Peripherals::take().unwrap();
//! let dp = stm32f30x::Peripherals::take().unwrap();
//!
//! let mut flash = dp.FLASH.constrain();
//! let mut rcc = dp.RCC.constrain();
//! let gpioe = dp.GPIOE.split(&mut rcc.ahb);
//!
//! // clock configuration using the default settings (all clocks run at 8 MHz)
//! let clocks = rcc.cfgr.freeze(&mut flash.acr);
//! // TRY this alternate clock configuration (all clocks run at 16 MHz)
//! // let clocks = rcc.cfgr.sysclk(16.mhz()).freeze(&mut flash.acr);
//!
//! let mut leds = Leds::new(gpioe);
//! let mut delay = Delay::new(cp.SYST, clocks);
//!
//! let n = leds.len();
//! loop {
//! for curr in 0..n {
//! let next = (curr + 1) % n;
//! leds[curr].off();
//! leds[next].on();
//!
//! delay.delay_ms(100_u8);
//! }
//! }
//! }
//!
//! exception!(HardFault, hard_fault);
//!
//! fn hard_fault(ef: &ExceptionFrame) -> ! {
//! panic!("{:#?}", ef);
//! }
//!
//! exception!(*, default_handler);
//!
//! fn default_handler(irqn: i16) {
//! panic!("Unhandled exception (IRQn = {})", irqn);
//! }
//! ```
// Auto-generated. Do not modify.