build.rs

// This file is based off the upstream copy at:
// https://github.com/ivmarkov/rust-esp32-std-demo
// This file is licensed under: "MIT OR Apache-2.0"

use std::path::PathBuf;

use embuild::{
    self, bingen,
    build::{CfgArgs, LinkArgs},
    cargo, symgen,
};

fn main() -> anyhow::Result<()> {
    // Necessary because of this issue: https://github.com/rust-lang/cargo/issues/9641
    LinkArgs::output_propagated("ESP_IDF")?;

    let cfg = CfgArgs::try_from_env("ESP_IDF")?;

    if cfg.get("esp32s2").is_some() {
        // Future; might be possible once https://github.com/rust-lang/cargo/issues/9096 hits Cargo nightly:
        //let ulp_elf = PathBuf::from(env::var_os("CARGO_BIN_FILE_RUST_ESP32_ULP_BLINK_rust_esp32_ulp_blink").unwrap());

        let ulp_elf = PathBuf::from("ulp").join("rust-esp32-ulp-blink");
        cargo::track_file(&ulp_elf);

        // This is where the RTC Slow Mem is mapped within the ESP32-S2 memory space
        let ulp_bin = symgen::Symgen::new(&ulp_elf, 0x5000_0000_u64).run()?;
        cargo::track_file(ulp_bin);

        let ulp_sym = bingen::Bingen::new(ulp_elf).run()?;
        cargo::track_file(ulp_sym);
    }

    cfg.output();

    Ok(())
}