#![no_std]
#![no_main]

use core::{fmt::Write, panic::PanicInfo, ptr::{read_volatile, write_volatile}};
use lwcpu::{NumberDisplay, Screen, ScreenMode, TextDisplay, SCREEN_POINTER};
use riscv_rt::entry;

#[panic_handler]
fn panic_handler(_info: &PanicInfo) -> ! {
    NumberDisplay::display_number(0xDEADC0DE);
    let mut text = TextDisplay{};
    let _ = write!(text, "Panic: {} {}", _info.message(), 1234);
    loop {}
}

const HELLO_WORLD: &str = " Hello world!";

#[entry]
fn main() -> ! {
    NumberDisplay::display_number(0);
    Screen::init(ScreenMode::Buffered);
    let mut text = TextDisplay{};
    text.init();
    for i in 0..32 {
        Screen::set_line(i, 1 << i);
    }
    Screen::display();
    Screen::clear();
    Screen::display();
    Screen::change_mode(ScreenMode::AlwaysDisplay);
    unsafe {
        write_volatile(SCREEN_POINTER, 0x001166ff);
        write_volatile(SCREEN_POINTER.offset(1), 0xAAAAAAAA);
        let ptr = SCREEN_POINTER as *mut u8;
        let b = read_volatile(ptr.offset(1));
        write_volatile(ptr.offset(5), b);
    }
    loop {
        let _ = text.write_str(HELLO_WORLD);
        panic!("Lmao")
    }
}