Tock capsule periodic "Hello World"

accelerate.rs

use kernel::hil::time::{self, Alarm, Frequency};

pub struct Accelerate<'a, A: Alarm + 'a> {
    alarm: &'a A
}

impl<'a, A: Alarm> Accelerate<'a, A> {
    pub fn new(alarm: &'a A) -> Accelerate<'a, A> {
        Accelerate {
            alarm: alarm
        }
    }

    pub fn start(&self) {
        self.alarm.set_alarm(
            self.alarm.now().wrapping_add(<A::Frequency>::frequency()))
    }
}

impl<'a, A: Alarm> time::Client for Accelerate<'a, A> {
    fn fired(&self) {
        self.start();
        debug!("Hello world");
    }
}

boot_sequence.rs

    let accelerate_virtual_alarm = static_init!(
        VirtualMuxAlarm<'static, sam4l::ast::Ast>,
        VirtualMuxAlarm::new(mux_alarm));
    let accelerate = static_init!(
            capsules::accelerate::Accelerate<'static,
                                VirtualMuxAlarm<'static, sam4l::ast::Ast<'static>>>,
            capsules::accelerate::Accelerate::new(accelerate_virtual_alarm));
    accelerate_virtual_alarm.set_client(accelerate);
    accelerate.start();