sachy.dev
A RPi Pico powered Lightning Detector
1//! This build script copies the `memory.x` file from the crate root into
2//! a directory where the linker can always find it at build time.
3//! For many projects this is optional, as the linker always searches the
4//! project root directory -- wherever `Cargo.toml` is. However, if you
5//! are using a workspace or have a more complicated build setup, this
6//! build script becomes required. Additionally, by requesting that
7//! Cargo re-run the build script whenever `memory.x` is changed,
8//! updating `memory.x` ensures a rebuild of the application with the
9//! new memory settings.
10
11use std::env;
12use std::fs::File;
13use std::io::{BufWriter, Write};
14use std::path::PathBuf;
15
16fn main() {
17 // Put `memory.x` in our output directory and ensure it's
18 // on the linker search path.
19 let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
20 File::create(out.join("memory.x"))
21 .unwrap()
22 .write_all(include_bytes!("memory.x"))
23 .unwrap();
24 println!("cargo:rustc-link-search={}", out.display());
25
26 // By default, Cargo will re-run a build script whenever
27 // any file in the project changes. By specifying `memory.x`
28 // here, we ensure the build script is only re-run when
29 // `memory.x` is changed.
30 println!("cargo:rerun-if-changed=memory.x");
31 println!("cargo:rerun-if-changed=config.kdl");
32
33 println!("cargo:rustc-link-arg-bins=--nmagic");
34 println!("cargo:rustc-link-arg-bins=-Tlink.x");
35 println!("cargo:rustc-link-arg-bins=-Tlink-rp.x");
36 println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
37
38 let config = include_str!("pico-config.toml");
39
40 let out_file = out.join("constants.rs");
41
42 let mut writer = BufWriter::new(
43 std::fs::OpenOptions::new()
44 .create(true)
45 .truncate(true)
46 .write(true)
47 .open(out_file)
48 .unwrap(),
49 );
50
51 sachy_config::output_config(config, &mut writer).unwrap();
52}