#![no_std]
#![no_main]

use panic_halt as _;

use cortex_m::peripheral::syst;
use cortex_m_rt::entry;

use ch57x_pac;

#[entry]
fn main() -> ! {
    let core_peripherals = cortex_m::Peripherals::take().unwrap();
    let peripherals = ch57x_pac::Peripherals::take().unwrap();

    let mut systick = core_peripherals.SYST;

    systick.set_clock_source(syst::SystClkSource::Core);
    systick.set_reload(8_000_000);
    systick.clear_current();

    systick.enable_counter();

    let ch57x_sys = peripherals.SYS;

    /* PB0: LED, data set to 1 */
    ch57x_sys.r32_pb_out__r8_slv_rd_data.modify(|r, w| unsafe {
        w.bits(r.bits() | 0x01)
    });

    /* PB0: LED, direction set to output */
    ch57x_sys.r32_pb_dir.modify(|r, w| unsafe {
        w.bits(r.bits() | 0x01)
    });

    loop {
        while !systick.has_wrapped() {
        }

        /* Toggle LED */
        ch57x_sys.r32_pb_out__r8_slv_rd_data.modify(|r, w| unsafe {
            w.bits(r.bits() ^ 0x01)
        });
    }
}