Basic arduino blink

.cargo/config.toml

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+[build]
+target-dir = "Binaries"
+target = "avr-atmega328p.json"
+
+[unstable]
+build-std = ["core"]

Cargo.toml

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+[package]
+name = "rust-avr"
+version = "0.1.0"
+edition = "2018"
+
+[[bin]]
+name = "RustAVR"
+path = "Source/Main.rs"
+bench = false
+test = false
+
+[dependencies]
+arduino-hal = { git = "https://github.com/Rahix/avr-hal", rev = "f84c0dff774c2292bc932b670955165161ecc7d1", features = ["arduino-uno"] }
+embedded-hal = "0.2.3"
+nb = "0.1.2"
+panic-halt = "0.2.0"
+ufmt = "0.1.0"
+
+[profile.dev]
+panic = "abort"
+lto = true
+opt-level = "s"
+
+[profile.release]
+panic = "abort"
+codegen-units = 1
+debug = true
+lto = true
+opt-level = "s"

Source/Main.rs

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+#![no_std]
+#![no_main]
+#![allow(non_snake_case)]
+#![allow(unused_imports)]
+
+use panic_halt as _;
+
+#[arduino_hal::entry]
+fn main() -> ! {
+    let peripherals = arduino_hal::Peripherals::take().unwrap();
+    let pins = arduino_hal::pins!(peripherals);
+
+    let mut led = pins.d13.into_output();
+
+    loop {
+        led.toggle();
+        arduino_hal::delay_ms(1000);
+    }
+}

avr-atmega328p.json

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+{
+    "llvm-target": "avr-unknown-unknown",
+    "cpu": "atmega328p",
+    "target-endian": "little",
+    "target-pointer-width": "16",
+    "target-c-int-width": "16",
+    "os": "unknown",
+    "arch": "avr",
+    "data-layout": "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8",
+    "executables": true,
+    "linker": "avr-gcc",
+    "linker-flavor": "gcc",
+    "pre-link-args": {
+        "gcc": [
+            "-Os",
+            "-mmcu=atmega328p"
+        ]
+    },
+    "exe-suffix": ".elf",
+    "post-link-args": {
+        "gcc": [
+            "-Wl,--gc-sections"
+        ]
+    },
+    "singlethread": false,
+    "no-builtins": false,
+    "no-default-libraries": false,
+    "eh-frame-header": false
+}

rust-toolchain

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+nightly-2021-01-07