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92 lines
2.6 KiB
Markdown
92 lines
2.6 KiB
Markdown
# `gba`
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# [Docs.rs Documentation](https://docs.rs/gba)
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## How To Make Your Own GBA Project Using This Crate
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This will require the use of Nightly Rust. Any recent-ish version of Nightly should be fine.
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### Get ARM Binutils
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You'll need the ARM version of the GNU binutils in your path, specifically the linker (`arm-none-eabi-ld`).
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Linux folks can use the package manager. Mac and Windows folks can use the [ARM Website](https://developer.arm.com/Tools%20and%20Software/GNU%20Toolchain).
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### Run `rustup component add rust-src`
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This makes rustup keep the standard library source code on hand, which is necessary for `build-std` to work.
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### Create `.cargo/config.toml`
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You should set up your project's cargo config like so:
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```toml
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[build]
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target = "thumbv4t-none-eabi"
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[unstable]
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build-std = ["core"]
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[target.thumbv4t-none-eabi]
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runner = "mgba-qt"
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rustflags = ["-Clink-arg=-Tlink_scripts/mono_boot.ld"]
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```
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This sets the default build target to be `thumbv4t-none-eabi` using the unstable `build-std` cargo feature.
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Also, this sets `cargo run` to run the binary as an argument to `mgba-qt`.
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If you're on windows then your copy of mGBA will be called "mgba.exe" instead.
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Also, this sets [mono_boot.ld](link_scripts/mono_boot.ld) as the linker script.
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You'll need to copy this into your project.
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If you save it to another location, adjust the path accordingly.
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### Make Your Executables
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At this point you can make a `bin` or an `example`.
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Every executable will need to be `no_std` and `no_main`.
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Place these at the top of the file:
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```rust
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#![no_std]
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#![no_main]
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```
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Every executable will need a panic handler defined, even if your code can't actually panic.
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A minimal panic handler looks like this:
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```rust
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#[panic_handler]
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fn panic_handler(_: &core::panic::PanicInfo) -> ! {
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loop {}
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}
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```
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Every executable will need a `main` function defined.
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We used the `no_main` attribute on the executable so that Rust will allow us to use a non-standard function signature:
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```rust
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#[no_mangle]
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extern "C" fn main() -> ! {
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loop {}
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}
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```
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### Optional: Use `objcopy` and `gbafix`
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The `cargo build` will produce ELF files, which mGBA can run directly.
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If you want to run your program on real hardware you'll need to:
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1) `objcopy` the raw binary out of the ELF into its own file.
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2) Use `gbafix` to give the file appropriate header data to that file.
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You can get `gbafix` through cargo: `cargo install gbafix`.
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## Other GBA Crates
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This crate provides a largely "unmanaged" interaction with the GBA's hardware.
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If you would like an API that use the borrow checker to guide you more,
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the [agb](https://docs.rs/agb) crate might be what you want.
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