#![no_main]
#![no_std]

extern crate panic_halt;

use core::fmt::Write;

use cortex_m_rt::entry;
use hal::{pac, prelude::*, rcc::Config};
use hd44780_driver::HD44780;
use heapless::Vec;

#[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 gpioa = dp.GPIOA.split(&mut rcc);
    let _gpiob = dp.GPIOB.split(&mut rcc);
    let gpioc = dp.GPIOC.split(&mut rcc);

    let d0 = gpioc.pc0.into_push_pull_output();
    let d1 = gpioc.pc1.into_push_pull_output();
    let d2 = gpioc.pc2.into_push_pull_output();
    let d3 = gpioc.pc3.into_push_pull_output();
    let d4 = gpioc.pc4.into_push_pull_output();
    let d5 = gpioc.pc5.into_push_pull_output();
    let d6 = gpioc.pc6.into_push_pull_output();
    let d7 = gpioc.pc7.into_push_pull_output();

    let rs = gpioc.pc8.into_push_pull_output();
    let en = gpioc.pc9.into_push_pull_output();

    let mut delay = cp.SYST.delay(rcc.clocks);

    let mut led = gpioa.pa5.into_push_pull_output();
    let mut lcd = HD44780::new_8bit(rs, en, d0, d1, d2, d3, d4, d5, d6, d7, &mut delay).unwrap();

    let mut i = 0;
    let mut buf: Vec<u8, 40> = Vec::new();
    loop {
        lcd.write_str("Hello world!", &mut delay).unwrap();
        led.set_high().unwrap();

        delay.delay_ms(500_u16);

        led.set_low().unwrap();
        write!(buf, "hello: {i}").unwrap();
        lcd.write_bytes(&buf, &mut delay).unwrap();

        delay.delay_ms(500_u16);

        i += 1;
    }
}