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//! Testing the Quadrature Encoder Interface
//!
//! ```
//! 
//! #![deny(unsafe_code)]
//! #![deny(warnings)]
//! #![no_std]
//! 
//! extern crate cortex_m;
//! extern crate cortex_m_semihosting as semihosting;
//! extern crate panic_abort;
//! extern crate stm32f103xx_hal as hal;
//! 
//! use core::fmt::Write;
//! 
//! use hal::delay::Delay;
//! use hal::prelude::*;
//! use hal::qei::Qei;
//! use hal::stm32f103xx;
//! use semihosting::hio;
//! 
//! fn main() {
//!     let dp = stm32f103xx::Peripherals::take().unwrap();
//!     let cp = cortex_m::Peripherals::take().unwrap();
//! 
//!     let mut flash = dp.FLASH.constrain();
//!     let mut rcc = dp.RCC.constrain();
//! 
//!     let clocks = rcc.cfgr.freeze(&mut flash.acr);
//! 
//!     let mut afio = dp.AFIO.constrain(&mut rcc.apb2);
//! 
//!     // let gpioa = dp.GPIOA.split(&mut rcc.apb2);
//!     let gpiob = dp.GPIOB.split(&mut rcc.apb2);
//! 
//!     // TIM2
//!     // let c1 = gpioa.pa0;
//!     // let c2 = gpioa.pa1;
//! 
//!     // TIM3
//!     // let c1 = gpioa.pa6;
//!     // let c2 = gpioa.pa7;
//! 
//!     // TIM4
//!     let c1 = gpiob.pb6;
//!     let c2 = gpiob.pb7;
//! 
//!     let qei = Qei::tim4(dp.TIM4, (c1, c2), &mut afio.mapr, &mut rcc.apb1);
//!     let mut delay = Delay::new(cp.SYST, clocks);
//! 
//!     let mut hstdout = hio::hstdout().unwrap();
//!     loop {
//!         let before = qei.count();
//!         delay.delay_ms(1_000_u16);
//!         let after = qei.count();
//! 
//!         let elapsed = after.wrapping_sub(before) as i16;
//! 
//!         writeln!(hstdout, "{}", elapsed).unwrap();
//!     }
//! }
//! ```
// Auto-generated. Do not modify.