#![no_main]
#![no_std]

use defmt::info;
use hal::adc::{Adc, Ready, VTemp};
use hal::gpio::Analog;
use hal::gpio::gpiob::PB1;
use panic_probe as _;

use defmt_rtt as _; // global logger

use cortex_m_rt::entry;
use hal::{pac, prelude::*, rcc::Config};

const MAGIC_TEMPERATURE_NUMBER: f32 = 12.412122;

#[entry]
fn main() -> ! {
    let dp = pac::Peripherals::take().unwrap();
    let cp = cortex_m::Peripherals::take().unwrap();

    let mut rcc = dp.RCC.freeze(Config::hsi16());
    let mut adc = dp.ADC.constrain(&mut rcc);

    let gpiob = dp.GPIOB.split(&mut rcc);

    let mut temp_pin = gpiob.pb1.into_analog();

    // Get the delay provider.
    let mut delay = cp.SYST.delay(rcc.clocks);

    let mut temp;
    let mut i = 0;
    loop {
        if i % 10_000 == 0 {
            temp = read_temp_c(&mut temp_pin, &mut adc);
            info!("Temperature: {}", temp);
        }
        // delay.delay_ms(200_u16);
        i += 1;
    }
}

fn read_temp_c(pin: &mut PB1<Analog>, adc: &mut Adc<Ready>) -> i16 {
    let v: f32 = adc
        .read(pin /* or maybe VTemp from the adc module? */)
        .expect("could not read with adc");
    (v / MAGIC_TEMPERATURE_NUMBER) as i16 - 50
}