I would like to program a bare attiny85 with rust. No existing development board, just my own layout. I figured that attiny-hal would be what I need, but I'm stuck at this error:
$ cargo check
Checking attiny-hal v0.1.0 (https://github.com/rahix/avr-hal?rev=4c9c44c314eb061ee20556ef10d45dea36e75ee4#4c9c44c3)
error: This crate requires you to specify your target chip as a feature.
Please select one of the following
* attiny85
* attiny88
* attiny167
* attiny2313
I tried these (and many other) settings in Crate.toml without success:
[package]
name = "avr01"
version = "0.1.0"
edition = "2021"
[features]
attiny85 = []
[dependencies.arduino-hal]
git = "https://github.com/rahix/avr-hal"
rev = "4c9c44c314eb061ee20556ef10d45dea36e75ee4"
features = ["attiny-hal"]
How do I select the target chip?
In your dependencies you have listed arduino-hal but you say you're programming a bare attiny85. You should include the attiny-hal crate directly and specify one of those features on the crate for example using this cargo command for an attiny85:
cargo add --git "https://github.com/rahix/avr-hal" attiny-hal -F attiny85
Which for some reason (I believe it's a bug) currently thinks attiny85 isn't a feature of attiny-hal but you can just specify it
in your Cargo.toml. The key for attiny-hal should include the required feature:
[dependencies.attiny-hal]
git = "https://github.com/rahix/avr-hal"
version = "*"
features = ["attiny85"]