Blinky on TM4C123GXL

main.rs

#![no_std]
#![no_main]

use panic_halt as _;
use cortex_m_rt::entry;
use tm4c123x_hal::{self as hal, prelude::*, delay::Delay};

#[entry]
fn main() -> ! {
    let p = hal::Peripherals::take().unwrap();
    let cp = hal::CorePeripherals::take().unwrap();

    let mut sc = p.SYSCTL.constrain();
    sc.clock_setup.oscillator = hal::sysctl::Oscillator::Main(
        hal::sysctl::CrystalFrequency::_16mhz,
        hal::sysctl::SystemClock::UsePll(hal::sysctl::PllOutputFrequency::_80_00mhz),
    );
    let clocks = sc.clock_setup.freeze();
    let mut delay = Delay::new(cp.SYST, &clocks);
    let portb = p.GPIO_PORTB.split(&sc.power_control);
    let mut led = portb.pb3.into_push_pull_output();
    
    loop {
        led.set_high();
        delay.delay_ms(500u16);
        led.set_low();
        delay.delay_ms(500u16);
    }
}