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//! Serial interface loopback test
//!
//! You have to short the TX and RX pins to make this program work
//!
//! ```
//! 
//! #![deny(unsafe_code)]
//! #![deny(warnings)]
//! #![no_std]
//! 
//! extern crate cortex_m;
//! #[macro_use(block)]
//! extern crate nb;
//! extern crate panic_abort;
//! extern crate stm32f103xx_hal as hal;
//! 
//! use cortex_m::asm;
//! use hal::prelude::*;
//! use hal::serial::Serial;
//! use hal::stm32f103xx;
//! 
//! fn main() {
//!     let p = stm32f103xx::Peripherals::take().unwrap();
//! 
//!     let mut flash = p.FLASH.constrain();
//!     let mut rcc = p.RCC.constrain();
//! 
//!     let clocks = rcc.cfgr.freeze(&mut flash.acr);
//! 
//!     let mut afio = p.AFIO.constrain(&mut rcc.apb2);
//! 
//!     // let mut gpioa = p.GPIOA.split(&mut rcc.apb2);
//!     let mut gpiob = p.GPIOB.split(&mut rcc.apb2);
//! 
//!     // USART1
//!     // let tx = gpioa.pa9.into_alternate_push_pull(&mut gpioa.crh);
//!     // let rx = gpioa.pa10;
//! 
//!     // USART1
//!     // let tx = gpiob.pb6.into_alternate_push_pull(&mut gpiob.crl);
//!     // let rx = gpiob.pb7;
//! 
//!     // USART2
//!     // let tx = gpioa.pa2.into_alternate_push_pull(&mut gpioa.crl);
//!     // let rx = gpioa.pa3;
//! 
//!     // USART3
//!     let tx = gpiob.pb10.into_alternate_push_pull(&mut gpiob.crh);
//!     let rx = gpiob.pb11;
//! 
//!     let serial = Serial::usart3(
//!         p.USART3,
//!         (tx, rx),
//!         &mut afio.mapr,
//!         9_600.bps(),
//!         clocks,
//!         &mut rcc.apb1,
//!     );
//! 
//!     let (mut tx, mut rx) = serial.split();
//! 
//!     let sent = b'X';
//! 
//!     block!(tx.write(sent)).ok();
//! 
//!     let received = block!(rx.read()).unwrap();
//! 
//!     assert_eq!(received, sent);
//! 
//!     asm::bkpt();
//! }
//! ```
// Auto-generated. Do not modify.