//! This example shows how to use PWM (Pulse Width Modulation) in the RP2040 chip.
//!
//! The LED on the RP Pico W board is connected differently. Add a LED and resistor to another pin.

#![no_std]
#![no_main]

use defmt::*;
use embassy_executor::Spawner;
use embassy_rp::block::ImageDef;
use embassy_rp::pwm::{Config, Pwm};
use embassy_time::Timer;
use {defmt_rtt as _, panic_probe as _};

#[link_section = ".start_block"]
#[used]
pub static IMAGE_DEF: ImageDef = ImageDef::secure_exe();

// Program metadata for `picotool info`
#[link_section = ".bi_entries"]
#[used]
pub static PICOTOOL_ENTRIES: [embassy_rp::binary_info::EntryAddr; 4] = [
    embassy_rp::binary_info_rp_cargo_bin_name!(),
    embassy_rp::binary_info_rp_cargo_version!(),
    embassy_rp::binary_info_rp_program_description!(c"Blinky"),
    embassy_rp::binary_info_rp_program_build_attribute!(),
];

#[embassy_executor::main]
async fn main(_spawner: Spawner) {
    let p = embassy_rp::init(Default::default());

    let mut c: Config = Default::default();
    c.top = 0x8000;
    c.compare_b = 8;
    let mut pwm = Pwm::new_output_b(p.PWM_SLICE4, p.PIN_25, c.clone());

    loop {
        info!("current LED duty cycle: {}/32768", c.compare_b);
        Timer::after_secs(1).await;
        c.compare_b = c.compare_b.rotate_left(4);
        pwm.set_config(&c);
    }
}