Basic build setup for at2560

.cargo/config.toml

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+[build]
+target = "avr-unknown-gnu-atmega2560.json"
+
+[unstable]
+build-std = ["core"]

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "rust-test"
+version = "0.1.0"
+authors = ["Rodrigo Valle <[email protected]>"]
+edition = "2018"
+
+[dependencies]
+# this is broken
+#ruduino = "0.2"

README.md

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+basically atmega2560.json is required to be the name because of a bug with
+relative paths in dylanmckay/target-cpu-utils

avr-unknown-gnu-atmega2560.json

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+{
+  "arch": "avr",
+  "atomic-cas": false,
+  "cpu": "atmega2560",
+  "data-layout": "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8",
+  "eh-frame-header": false,
+  "env": "",
+  "exe-suffix": ".elf",
+  "executables": true,
+  "is-builtin": true,
+  "late-link-args": {
+      "gcc": [
+          "-lgcc",
+          "-lc"
+      ]
+  },
+  "linker": "avr-gcc",
+  "linker-flavor": "gcc",
+  "linker-is-gnu": true,
+  "llvm-target": "avr-unknown-unknown",
+  "max-atomic-width": 0,
+  "os": "unknown",
+  "panic-strategy": "abort",
+  "pre-link-args": {
+    "gcc": [
+      "-mmcu=atmega2560",
+      "-Wl,--as-needed"
+    ]
+  },
+  "target-c-int-width": "16",
+  "target-endian": "little",
+  "target-pointer-width": "16",
+  "vendor": "unknown"
+}

rust-toolchain

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+nightly

src/main.rs

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+#![feature(llvm_asm)]
+
+#![no_std]
+#![no_main]
+
+use core::panic::PanicInfo;
+
+
+#[no_mangle]
+pub extern fn main() {
+    delay();
+}
+
+fn delay() {
+    for _ in 0..400000 {
+        unsafe { llvm_asm!("" :::: "volatile") }
+    }
+}
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    //println!("{}", info);
+    loop {}
+}