#![no_std]
#![no_main]
#![deny(
    clippy::mem_forget,
    reason = "mem::forget is generally not safe to do with esp_hal types, especially those \
    holding buffers for the duration of a data transfer."
)]
#![deny(clippy::large_stack_frames)]

use esp_hal::{
    clock::CpuClock,
    gpio::{Output, OutputConfig},
    main,
    time::{Duration, Instant},
};

use esp_backtrace as _;

extern crate alloc;

// This creates a default app-descriptor required by the esp-idf bootloader.
// For more information see: <https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/system/app_image_format.html#application-description>
esp_bootloader_esp_idf::esp_app_desc!();

#[allow(
    clippy::large_stack_frames,
    reason = "it's not unusual to allocate larger buffers etc. in main"
)]
#[main]
fn main() -> ! {
    // generator version: 1.3.0
    // generator parameters: --chip esp32 -o esp32-wroom-32e -o alloc -o esp-backtrace -o log -o vscode

    esp_println::logger::init_logger_from_env();

    let config = esp_hal::Config::default().with_cpu_clock(CpuClock::max());
    let peripherals = esp_hal::init(config);

    // The following pins are used to bootstrap the chip. They are available
    // for use, but check the datasheet of the module for more information on them.
    // - GPIO0
    // - GPIO2
    // - GPIO5
    // - GPIO12
    // - GPIO15
    // These GPIO pins are in use by some feature of the module and should not be used.
    let _ = peripherals.GPIO6;
    let _ = peripherals.GPIO7;
    let _ = peripherals.GPIO8;
    let _ = peripherals.GPIO9;
    let _ = peripherals.GPIO10;
    let _ = peripherals.GPIO11;
    let _ = peripherals.GPIO16;
    let _ = peripherals.GPIO20;

    esp_alloc::heap_allocator!(#[esp_hal::ram(reclaimed)] size: 98768);

    let mut led = Output::new(
        peripherals.GPIO21,
        esp_hal::gpio::Level::High,
        OutputConfig::default(),
    );

    loop {
        log::info!("Hello world!");
        led.toggle();
        let delay_start = Instant::now();
        while delay_start.elapsed() < Duration::from_millis(500) {}
    }

    // for inspiration have a look at the examples at https://github.com/esp-rs/esp-hal/tree/esp-hal-v1.1.0/examples
}