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

// mod i2c_reg_slave;
// mod i2c_slave;
mod dmx;

// extern crate panic_halt;
extern crate panic_semihosting;

#[rtic::app(device = stm32f1xx_hal::pac, dispatchers = [SPI1, SPI2, SPI3])]
mod app {
    use crate::dmx::DMX;
    use cortex_m::singleton;
    use stm32f1xx_hal::{gpio, pac, prelude::*, serial, timer};
    use systick_monotonic::Systick;

    const DMX_LEN: usize = 512;

    // A monotonic timer to enable scheduling in RTIC
    #[monotonic(binds = SysTick, default = true)]
    type MyMono = Systick<100>; // 100 Hz / 10 ms granularity

    #[shared]
    struct Shared {
        buffer: &'static mut [u8],
        delay_us: timer::DelayUs<pac::TIM2>,
    }

    #[local]
    struct Local {
        dmx: DMX<DMX_LEN>,
        led: gpio::gpioc::PC13<gpio::Output<gpio::PushPull>>,
        int_led: gpio::gpiob::PB0<gpio::Output<gpio::OpenDrain>>,
    }

    #[init]
    fn init(mut cx: init::Context) -> (Shared, Local, init::Monotonics) {
        // Take ownership over the raw flash and rcc devices and convert them into the corresponding
        // HAL structs
        let mut flash = cx.device.FLASH.constrain();
        let rcc = cx.device.RCC.constrain();

        // Freeze the configuration of all the clocks in the system and store the frozen frequencies in
        // `clocks`
        let clocks = rcc
            .cfgr
            // hf external quartz frequency
            .use_hse(8.MHz())
            // system clock frequency
            .sysclk(72.MHz())
            .freeze(&mut flash.acr);

        // Initialize the monotonic
        let mono = Systick::new(cx.core.SYST, clocks.sysclk().to_Hz());

        // Acquire the peripherals
        let mut gpioa = cx.device.GPIOA.split();
        let mut gpiob = cx.device.GPIOB.split();
        let mut gpioc = cx.device.GPIOC.split();

        let mut afio = cx.device.AFIO.constrain();
        let dma1 = cx.device.DMA1.split();

        let _ = gpiob.pb10.into_pull_up_input(&mut gpiob.crh);

        // enable EXTI10 for port B
        afio.exticr3
            .exticr3()
            .write(|w| unsafe { w.exti10().bits(0b0001) });
        // mask EXTI10
        cx.device.EXTI.imr.write(|w| w.mr10().set_bit());
        // EXTI10 on falling edge
        cx.device.EXTI.ftsr.write(|w| w.tr10().set_bit());

        // set EXTI10 priority
        unsafe {
            // pac::NVIC::unmask(pac::Interrupt::EXTI15_10);
            cx.core.NVIC.set_priority(pac::Interrupt::EXTI15_10, 1);
        }

        // Serial config
        let serial = serial::Serial::new(
            cx.device.USART1,
            (
                gpioa.pa9.into_alternate_open_drain(&mut gpioa.crh),
                gpioa.pa10, //.into_pull_up_input(&mut gpioa.crh),
            ),
            &mut afio.mapr,
            serial::Config::default(),
            &clocks,
        );

        // rtic::pend(pac::Interrupt::DMA1_CHANNEL4); // ???
        // let nvic = cx.device.NVIC_STIR;
        foo::spawn().unwrap();

        (
            Shared {
                buffer: singleton!(: [u8; DMX_LEN] = [0b01010101; DMX_LEN]).unwrap(),

                // Configure timer
                delay_us: cx.device.TIM2.delay_us(&clocks),
            },
            Local {
                dmx: DMX::new(serial, dma1.4, &clocks),

                // Configure gpio C pin 13 as a push-pull output. The `crh` register is passed to the function
                // in order to configure the port. For pins 0-7, crl should be passed instead.
                led: gpioc
                    .pc13
                    .into_push_pull_output_with_state(&mut gpioc.crh, gpio::PinState::High),

                int_led: gpiob
                    .pb0
                    .into_open_drain_output_with_state(&mut gpiob.crl, gpio::PinState::Low),
            },
            init::Monotonics(mono),
        )
    }

    #[idle]
    fn idle(_: idle::Context) -> ! {
        loop {
            rtic::export::wfi();
        }
    }

    #[task(local = [dmx, led], shared = [&buffer, delay_us])]
    fn foo(mut cx: foo::Context) {
        cx.local.dmx.send(cx.shared.buffer);

        cx.local.led.toggle();
        cx.shared.delay_us.lock(|d| d.delay(1.secs()));

        // cx.local.dmx.wait();
        foo::spawn().unwrap();
    }

    #[task(binds=EXTI15_10, local = [int_led], shared = [delay_us])]
    fn bar(mut cx: bar::Context) {
        let dp = unsafe { pac::Peripherals::steal() };

        // EXTI10 must be pending
        if dp.EXTI.pr.read().pr10().bit() {
            cx.local.int_led.toggle();
            cx.shared.delay_us.lock(|d| d.delay(100.millis()));

            // clear EXTI10 pending status
            dp.EXTI.pr.write(|w| w.pr10().set_bit());
        }
    }
}