pub static TICK_OVERFLOW_COUNT: AtomicU32 = AtomicU32::new(0);

/// Example use, to get seconds since start: `tick_count_fm_overflows_s() +
/// tick_timer.time_elapsed().as_secs()`
fn tick_count_fm_overflows_s() -> f32 {
    crate::TICK_OVERFLOW_COUNT.load(Ordering::Acquire) as f32 * crate::TICK_TIMER_PERIOD
}

/// Hard-coded to use our tick timer directly.
pub fn get_timestamp(timer: &mut Timer<TIM3>) -> f32 {
    let elapsed = timer.time_elapsed().as_secs();

    tick_count_fm_overflows_s() + elapsed
}

    #[task(binds = TIM3, shared = [tick_timer], priority = 1)]
    /// Increments the tick overflow.
    fn tick_isr(_cx: tick_isr::Context) {
        cx.shared.tick_timer.lock(|timer| timer.clear_interrupt(TimerInterrupt::Update) 

        TICK_OVERFLOW_COUNT.fetch_add(1, Ordering::Relaxed);
    }