【Arduino工作〜発展編】RustでATmega328pのプログラムをビルドしてみる

            $ rustup --version
rustup 1.23.1 (3df2264a9 2020-11-30)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.51.0-nightly (c2de47a9a 2021-01-06)`
        

            $ sudo apt-get install binutils gcc-avr avr-libc avrdude
        

            $ rustup update
$ rustup toolchain install nightly
$ rustup component add rust-src --toolchain nightly
$ rustup override set nightly
$ rustc -Vv
rustc 1.51.0-nightly (c2de47a9a 2021-01-06)
binary: rustc
commit-hash: c2de47a9aa4c9812884f341f1852e9c9610f5f7a
commit-date: 2021-01-06
host: x86_64-unknown-linux-gnu
release: 1.51.0-nightly
        

            $ rustc --print target-spec-json -Z unstable-options \
    --target avr-unknown-gnu-atmega328 > avr-atmega328p.json
        

            {
    "arch": "avr",
    "atomic-cas": false,
    "cpu": "atmega328",
    "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,
    "exe-suffix": ".elf",
    "executables": true,
    "is-builtin": true,
    "late-link-args": {
        "gcc": [
        "-lgcc"
        ]
    },
    "linker": "avr-gcc",
    "linker-is-gnu": true,
    "llvm-target": "avr-unknown-unknown",
    "max-atomic-width": 0,
    "pre-link-args": {
        "gcc": [
        "-mmcu=atmega328",
        "-Wl,--as-needed"
        ]
    },
    "target-c-int-width": "16",
    "target-pointer-width": "16"
}
        

            {
    //...
    "cpu": "atmega328p",
    //...
    "pre-link-args": {
        "gcc": [
            "-mmcu=atmega328p",
            //...
        ]
    },
    //...
}
        

            $ tree
.
├── Cargo.toml
├── src
│   └── main.rs
└── avr-atmega328p.json
        

            [package]
name = "blink"
version = "0.1.0"
authors = ["Dylan McKay <me@dylanmckay.io>"]
edition = '2018'

[dependencies]
ruduino = "0.3"
        

            #![feature(llvm_asm)]

#![no_std]
#![no_main]

use ruduino::Pin;
use ruduino::cores::current::{port};

#[no_mangle]
pub extern fn main() {
    port::B5::set_output();
    loop {
        port::B5::set_high();
        ruduino::delay::delay_ms(1000);
        port::B5::set_low();
        ruduino::delay::delay_ms(1000);
    }
}
        

            $ export AVR_CPU_FREQUENCY_HZ=16000000
$ cargo build -Z build-std=core --target avr-atmega328p.json --release
        

            $ sudo avrdude -p m328p -c atmelice_isp -P usb -U flash:w:target/avr-atmega328p/release/blink.elf:e
        

            $ cargo build -Z build-std=core --target avr-unknown-gnu-atmega328 --release
   Compiling compiler_builtins v0.1.39
   Compiling nb v1.0.0
   #...
   Compiling embedded-hal v0.2.4
LLVM ERROR: Not supported instr: <MCInst 258 <MCOperand Reg:1> <MCOperand Imm:15> <MCOperand Reg:40>>
error: could not compile `compiler_builtins`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed
        

            $ rustup toolchain install nightly-2021-01-07
$ rustup component add rust-src --toolchain nightly-2021-01-07
$ rustup override set nightly-2021-01-07