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//! Test the serial interface
//!
//! This example requires you to short (connect) the TX and RX pins.
//!
//! ```
//! #![deny(unsafe_code)]
//! #![deny(warnings)]
//! #![no_main]
//! #![no_std]
//! 
//! extern crate cortex_m;
//! #[macro_use(entry, exception)]
//! extern crate cortex_m_rt as rt;
//! extern crate f3;
//! #[macro_use(block)]
//! extern crate nb;
//! extern crate panic_semihosting;
//! 
//! use cortex_m::asm;
//! use f3::hal::prelude::*;
//! use f3::hal::serial::Serial;
//! use f3::hal::stm32f30x;
//! use rt::ExceptionFrame;
//! 
//! entry!(main);
//! 
//! fn main() -> ! {
//!     let p = stm32f30x::Peripherals::take().unwrap();
//! 
//!     let mut flash = p.FLASH.constrain();
//!     let mut rcc = p.RCC.constrain();
//!     let mut gpioa = p.GPIOA.split(&mut rcc.ahb);
//!     let mut gpiob = p.GPIOB.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 (clocks run at nearly the maximum frequency)
//!     // let clocks = rcc.cfgr.sysclk(64.mhz()).pclk1(32.mhz()).freeze(&mut flash.acr);
//! 
//!     // The Serial API is highly generic
//!     // TRY the commented out, different pin configurations
//!     let tx = gpioa.pa9.into_af7(&mut gpioa.moder, &mut gpioa.afrh);
//!     // let tx = gpiob.pb6.into_af7(&mut gpiob.moder, &mut gpiob.afrl);
//! 
//!     // let rx = gpioa.pa10.into_af7(&mut gpioa.moder, &mut gpioa.afrh);
//!     let rx = gpiob.pb7.into_af7(&mut gpiob.moder, &mut gpiob.afrl);
//! 
//!     // TRY using a different USART peripheral here
//!     let serial = Serial::usart1(p.USART1, (tx, rx), 9_600.bps(), clocks, &mut rcc.apb2);
//!     let (mut tx, mut rx) = serial.split();
//! 
//!     let sent = b'X';
//! 
//!     // The `block!` macro makes an operation block until it finishes
//!     // NOTE the error type is `!`
//!     block!(tx.write(sent)).ok();
//! 
//!     let received = block!(rx.read()).unwrap();
//! 
//!     assert_eq!(received, sent);
//! 
//!     // if all goes well you should reach this breakpoint
//!     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);
//! }
//! ```
// Auto-generated. Do not modify.