feat: simple blinky 2-led with Rust

src/main.rs

@@ -1,49 +1,42 @@
+//! Blinks an LED
+//!
+//! This assumes that a LED is connected to the pin assigned to `led`. (GPIO0)
+
+//% CHIPS: esp32 esp32c2 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3
+
 #![no_std]
 #![no_main]
 
 use esp_backtrace as _;
 use esp_hal::{
- clock::ClockControl, delay::Delay, peripherals::Peripherals, prelude::*, system::SystemControl,
+ clock::ClockControl,
+ delay::Delay,
+ gpio::{Io, Level, Output},
+ peripherals::Peripherals,
+ prelude::*,
+ system::SystemControl,
 };
 
-extern crate alloc;
-use core::mem::MaybeUninit;
-
-#[global_allocator]
-static ALLOCATOR: esp_alloc::EspHeap = esp_alloc::EspHeap::empty();
-
-fn init_heap() {
- const HEAP_SIZE: usize = 32 * 1024;
- static mut HEAP: MaybeUninit<[u8; HEAP_SIZE]> = MaybeUninit::uninit();
-
- unsafe {
- ALLOCATOR.init(HEAP.as_mut_ptr() as *mut u8, HEAP_SIZE);
- }
-}
-
 #[entry]
 fn main() -> ! {
  let peripherals = Peripherals::take();
  let system = SystemControl::new(peripherals.SYSTEM);
+ let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
 
- let clocks = ClockControl::max(system.clock_control).freeze();
- let delay = Delay::new(&clocks);
- init_heap();
+ // Set GPIO0 as an output, and set its state high initially.
+ let io = Io::new(peripherals.GPIO, peripherals.IO_MUX);
+ let mut led_red = Output::new(io.pins.gpio8, Level::High);
+ let mut led_blue = Output::new(io.pins.gpio9, Level::High);
 
- esp_println::logger::init_logger_from_env();
-
- let timer = esp_hal::timer::timg::TimerGroup::new(peripherals.TIMG1, &clocks, None).timer0;
- let _init = esp_wifi::initialize(
- esp_wifi::EspWifiInitFor::Wifi,
- timer,
- esp_hal::rng::Rng::new(peripherals.RNG),
- peripherals.RADIO_CLK,
- &clocks,
- )
- .unwrap();
+ let delay = Delay::new(&clocks);
 
  loop {
- log::info!("Hello world!");
- delay.delay(500.millis());
+ led_red.toggle();
+ led_blue.toggle();
+ delay.delay_millis(500);
+ led_red.toggle();
+ led_blue.toggle();
+ // or using `fugit` duration
+ delay.delay(2.secs());
  }
-}
+}