#![deny(unsafe_code)]
#![no_main]
#![no_std]

use panic_semihosting as _;

use stm32f1xx_hal::{
    prelude::*,
    pac,
    adc,
};
use cortex_m_rt::entry;

use cortex_m_semihosting::hprintln;

#[entry]
fn main() -> ! {
    // Aquire peripherals
    let p = pac::Peripherals::take().unwrap();
    let mut flash = p.FLASH.constrain();
    let mut rcc = p.RCC.constrain();

    let clocks = rcc.cfgr.use_hse(8.mhz()).sysclk(56.mhz()).pclk1(28.mhz()).adcclk(14.mhz()).freeze(&mut flash.acr);
    hprintln!("sysclk freq: {}", clocks.sysclk().0).unwrap();
    hprintln!("adc freq: {}", clocks.adcclk().0).unwrap();

    // Setup ADC
    let mut adc = adc::Adc::adc1(p.ADC1, &mut rcc.apb2, clocks);

    // Read temperature sensor
    loop {
        let temp = adc.read_temp();

        hprintln!("temp: {}", temp).unwrap();
    }
}