fw-rust: Minimal hello world

firmware/rust/src/main.rs

@@ -0,0 +1,20 @@
+#![no_std]
+#![no_main]
+
+use atmega_hal::{clock::MHz8, delay::Delay, pins, Peripherals};
+use embedded_hal::blocking::delay::DelayMs;
+use panic_halt as _;
+
+#[atmega_hal::entry]
+fn main() -> ! {
+    let dp = Peripherals::take().unwrap();
+    let pins = pins!(dp);
+
+    let mut led = pins.pd5.into_output();
+    let mut delay = Delay::<MHz8>::new();
+
+    loop {
+        led.toggle();
+        delay.delay_ms(255_u8);
+    }
+}