// Create a program to generate audio tones using PWM for a simple buzzer. A buzzer has two terminals,
// one terminal hooks up to the PWM output and the other to ground. Implement functions to
// play different musical notes by generating corresponding PWM signals with appropriate frequencies.

// Wiring
// The buzzer second terminal (PWM input) is connected to gpio 0.
// The buzzer first terminal is connected to ground.

#![no_std]
#![no_main]

use esp_backtrace as _;
use esp_println::println;
use esp_hal::{clock::ClockControl, peripherals::Peripherals, prelude::*, Delay};

#[entry]
fn main() -> ! {
    let peripherals = Peripherals::take();
    let system = peripherals.SYSTEM.split();
    let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
    let mut delay = Delay::new(&clocks);

    println!("Hello world!");

    loop {
        println!("Loop...");
        delay.delay_ms(500u32);
    }
}