stm32l4-hal 0.3.0

Hardware abstraction layer for the stm32l4xx chips
Documentation 
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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;
#[macro_use(block)]
extern crate nb;
extern crate panic_semihosting;

extern crate stm32l4xx_hal as hal;
// #[macro_use(block)]
// extern crate nb;

use cortex_m::asm;
use crate::hal::prelude::*;
use crate::hal::serial::Serial;
use crate::rt::ExceptionFrame;

#[entry]
fn main() -> ! {
    let p = hal::stm32::Peripherals::take().unwrap();

    let mut flash = p.FLASH.constrain();
    let mut rcc = p.RCC.constrain();
    let mut gpioa = p.GPIOA.split(&mut rcc.ahb2);
    // let mut gpiob = p.GPIOB.split(&mut rcc.ahb2);

    // 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(80.mhz()).pclk1(80.mhz()).pclk2(80.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 = gpioa.pa2.into_af7(&mut gpioa.moder, &mut gpioa.afrl);
    // 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 = gpioa.pa3.into_af7(&mut gpioa.moder, &mut gpioa.afrl);
    // let rx = gpiob.pb7.into_af7(&mut gpiob.moder, &mut gpiob.afrl);

    // TRY using a different USART peripheral here
    let serial = Serial::usart2(p.USART2, (tx, rx), 9_600.bps(), clocks, &mut rcc.apb1r1);
    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]
fn HardFault(ef: &ExceptionFrame) -> ! {
    panic!("{:#?}", ef);
}