stm32f042-hal 0.4.0

Peripheral access API for STM32F042 microcontrollers
Documentation 
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#![feature(used)]
#![no_main]
#![no_std]

#[macro_use(entry, exception)]
extern crate cortex_m_rt;

use cortex_m_rt::ExceptionFrame;

extern crate panic_abort;
extern crate stm32f042_hal as hal;

use hal::prelude::*;
use hal::stm32f042;

#[macro_use(block)]
extern crate nb;

use hal::serial::Serial;

exception!(*, default_handler);

fn default_handler(_irqn: i16) {}

exception!(HardFault, hard_fault);

fn hard_fault(_ef: &ExceptionFrame) -> ! {
    loop {}
}

entry!(main);

fn main() -> ! {
    if let Some(p) = stm32f042::Peripherals::take() {
        let gpioa = p.GPIOA.split();
        let mut rcc = p.RCC.constrain();
        let clocks = rcc.cfgr.sysclk(48.mhz()).freeze();

        let tx = gpioa.pa9.into_alternate_af1();
        let rx = gpioa.pa10.into_alternate_af1();

        let serial = Serial::usart1(p.USART1, (tx, rx), 115_200.bps(), clocks);

        let (mut tx, mut rx) = serial.split();

        loop {
            let received = block!(rx.read()).unwrap();
            block!(tx.write(received)).ok();
        }
    }

    loop {}
}