#![no_std]
#![no_main]

use atmega_hal::{
    pins,
    spi::{DataOrder, SerialClockRate, Settings, Spi},
    Peripherals,
};
use avr_device::interrupt;
use embedded_hal::spi::{Mode, Phase, Polarity};
use panic_halt as _;

#[atmega_hal::entry]
fn main() -> ! {
    // Disable interrupts when initializing
    interrupt::disable();

    // Get peripherals and pins
    let dp = Peripherals::take().unwrap();
    let pins = pins!(dp);

    // Init display backlight
    let tc0 = dp.TC0;
    tc0.tccr0a.write(|w| {
        w.wgm0().pwm_fast();
        w.com0b().match_clear();
        w
    });
    tc0.tccr0b.write(|w| {
        w.wgm02().set_bit();
        w.cs0().prescale_64();
        w
    });
    tc0.ocr0a.write(|w| unsafe { w.bits(255) });
    // TODO: Use EEPROM
    tc0.ocr0b.write(|w| unsafe { w.bits(0) });
    pins.pd5.into_output();

    // Init SPI
    let (_, _) = Spi::new(
        dp.SPI,
        pins.pb5.into_output(),
        pins.pb3.into_output(),
        pins.pb4.into_pull_up_input(),
        pins.pb2.into_output(),
        Settings {
            data_order: DataOrder::MostSignificantFirst,
            clock: SerialClockRate::OscfOver2,
            mode: Mode {
                polarity: Polarity::IdleLow,
                phase: Phase::CaptureOnFirstTransition,
            },
        },
    );

    // Enable interrupts
    unsafe { interrupt::enable() };

    #[allow(clippy::empty_loop)]
    loop {}
}