Ensure that you are using an AVR target! You may need to change directories or pass a --target flag to cargo

[Kurren123]

I'm on windows

I'm getting this error when I follow online tutorials. My cargo.toml:

[package]
name = "rust-arduino-blink"
version = "0.1.0"
authors = [""]
edition = "2018"

[dependencies]
panic-halt = "0.2.0"

[dependencies.arduino-uno]
git = "https://github.com/Rahix/avr-hal"

[build]
target = "avr-atmega328p.json"

[unstable]
build-std = ["core"]

And my main.rs:

#![no_std]
#![no_main]

extern crate panic_halt;

use arduino_uno::prelude::*;

#[arduino_uno::entry]
fn main() -> ! {
    let dp = arduino_uno::Peripherals::take().unwrap();

    unimplemented!()
}

Any help would be much appreciated!

[Rahix]

You need to read the instructions more carefully ;)

This part:

[build]
target = "avr-atmega328p.json"

[unstable]
build-std = ["core"]

does not belong into Cargo.toml, but into a separate file named .cargo/config.toml.

Also, you need more directives in your Cargo.toml to configure the build profile. Take another look at the Starting your own project guide to see the details.

[Kurren123]

@Rahix Thanks for your help! I've now created the Cargo.toml and .cargo/config.toml, repository here. However I'm now getting this error when I do rustup override set nightly and cargo build --verbose:

error: could not compile `compiler_builtins`

Caused by:
  process didn't exit successfully: `rustc --crate-name compiler_builtins "C:\Users\Kurren N\.cargo\registry\src\github.com-
1ecc6299db9ec823\compiler_builtins-0.1.39\src\lib.rs" --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-
type lib --emit=dep-info,metadata,link -C opt-level=s -C panic=abort -C linker-plugin-lto -C debuginfo=2 -C debug-
assertions=on --cfg "feature=\"compiler-builtins\"" --cfg "feature=\"core\"" --cfg "feature=\"default\"" --cfg "feature=\"rustc-
dep-of-std\"" -C metadata=c49ed016198a86a1 -C extra-filename=-c49ed016198a86a1 --out-dir C:\dev\Arduino\rust-arduino-
blink\target\avr-atmega328p\debug\deps --target \\?\C:\dev\Arduino\rust-arduino-blink\avr-atmega328p.json -Z force-
unstable-if-unmarked -L dependency=C:\dev\Arduino\rust-arduino-blink\target\avr-atmega328p\debug\deps -L 
dependency=C:\dev\Arduino\rust-arduino-blink\target\debug\deps --extern core=C:\dev\Arduino\rust-arduino-
blink\target\avr-atmega328p\debug\deps\librustc_std_workspace_core-494a22ba4d488457.rmeta --cap-lints allow --cfg 
"feature=\"unstable\""` (exit code: 101)

Any suggestions?

[Rahix]

Please try using nightly-2021-01-07 instead (#124):

rustup toolchain install nightly-2021-01-07
rustup override set nightly-2021-01-07

Also, you should probably pin the version of avr-hal in your dependencies like this:

[dependencies.arduino-uno]
git = "https://github.com/rahix/avr-hal"
rev = "b1aedf824fcb59078f8022d4464b2835ae4bd83a"

[Kurren123]

Thanks, this now worked! Only issue is that my IDE is showing errors as rust language server is not available on that nightly date, and it's hard to find the most recent nightly build before the 8th jan that includes rls.

Thanks again for your help!

[Nambers]

I am also facing this problem in my Clion 2023.2.2 with Rust plugin. It works well (it can be built and flashed), the only problem is the IDE compile error
This is my .cargo/config.toml:

[build]
target = "avr-specs/avr-atmega2560.json"

[target.'cfg(target_arch = "avr")']
runner = "ravedude mega2560 -cb 57600"

[unstable]
build-std = ["core"]

[Rahix]

It seems your IDE is not picking up the target from .cargo/config.toml. You'll have to ask the Clion Rust project about possible reasons for this. Maybe they don't support json target specs?

[Nambers]

It seems your IDE is not picking up the target from .cargo/config.toml. You'll have to ask the Clion Rust project about possible reasons for this. Maybe they don't support json target specs?

Gotcha I'll report this to intellij-rust/intellij-rust