#[entry]
fn main() -> ! {
    if let Some(mut p) = pac::Peripherals::take() {
        if let Some(cp) = Peripherals::take() {
            let button = cortex_m::interrupt::free(|cs| gpioa.pa2.into_pull_up_input(cs));
            let mut x = cortex_m::interrupt::free(|cs| gpioa.pa3.into_analog(cs));
            let mut y = cortex_m::interrupt::free(|cs| gpioa.pa1.into_analog(cs));
            let mut adc = Adc::new(p.ADC, &mut rcc);
            let mut log_counter = 0u64;
            let mut low_since: Option<u64> = None;

            loop {
                let is_low = button.is_low().unwrap();
                if is_low && low_since.is_none() {
                    low_since.replace(log_counter);
                } else if !is_low {
                    low_since.take();
                }
                if let Some(low_since2) = low_since {
                    if low_since2.abs_diff(log_counter) >= 1_000 {
                        low_since.take();
                        // do something
                    } else {
                        //defmt::println!("low since not big enough: {}", low);
                    }
                }
                log_counter = log_counter.wrapping_add(1);
                if log_counter % 500 == 0 {
                    // do something else
                }
            }
        }
    }
    loop {}
}