feather_m0 0.20.3

Board Support crate for the Adafruit Feather M0
Documentation 
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#![no_std]
#![no_main]

#[cfg(not(feature = "use_semihosting"))]
use panic_halt as _;
#[cfg(feature = "use_semihosting")]
use panic_semihosting as _;

use bsp::hal;
use bsp::pac;
use feather_m0 as bsp;

use bsp::{entry, pin_alias};
use hal::clock::GenericClockController;
use hal::ehal::digital::OutputPin;
use hal::nb;
use hal::time::Hertz;
use hal::timer::TimerCounter;
use hal::timer_traits::InterruptDrivenTimer;
use pac::Peripherals;

#[entry]
fn main() -> ! {
    let mut peripherals = Peripherals::take().unwrap();
    let mut clocks = GenericClockController::with_external_32kosc(
        peripherals.gclk,
        &mut peripherals.pm,
        &mut peripherals.sysctrl,
        &mut peripherals.nvmctrl,
    );
    let pins = bsp::Pins::new(peripherals.port);
    let mut red_led: bsp::RedLed = pin_alias!(pins.red_led).into();

    // gclk0 represents a configured clock using the system 48MHz oscillator
    let gclk0 = clocks.gclk0();
    // configure a clock for the TC4 and TC5 peripherals
    let tc45 = &clocks.tc4_tc5(&gclk0).unwrap();
    // instantiate a timer objec for the TC4 peripheral
    let mut timer = TimerCounter::tc4_(tc45, peripherals.tc4, &mut peripherals.pm);
    // start a 5Hz timer
    timer.start(Hertz::Hz(5).into_duration());

    // toggle the red LED at the frequency set by the timer
    loop {
        nb::block!(timer.wait()).unwrap();
        red_led.set_high().unwrap();
        nb::block!(timer.wait()).unwrap();
        red_led.set_low().unwrap();
    }
}