moving standalone mode to alsa rust direct binding crate & moving led_driver to a specific package

lightsabre_backend/led_driver/build.rs

@@ -0,0 +1,26 @@
+use std::{env, path::PathBuf};
+
+fn main() {
+    println!("cargo::rustc-link-search=/workspaces/LightSabre/lightsabre_backend/led_driver/lib");
+
+    // Tell cargo to tell rustc to link the RPiLedBars_drivers and logc libraries.
+    println!("cargo:rustc-link-lib=RpiLedBars_drivers_8ch");
+    println!("cargo:rustc-link-lib=logc");
+
+    // The bindgen::Builder is the main entry point to bindgen, and lets you build up options for the resulting bindings.
+    let bindings = bindgen::Builder::default()
+        // The input header we would like to generate bindings for.
+        .header("lib/wrapper.h")
+        // Tell cargo to invalidate the built crate whenever any of the included header files changed.
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
+        // Finish the builder and generate the bindings.
+        .generate()
+        // Unwrap the Result and panic on failure.
+        .expect("Unable to generate bindings");
+
+    // Write the bindings to the $OUT_DIR/bindings.rs file.
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write bindings!");
+}