the led isn't lighting up :'(

build.rs

@@ -0,0 +1,19 @@
+// I totally understand this and it's not copied from
+// https://github.com/cyang812/rust_stm32f469i/blob/main/led_blinky/
+// hehe
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+
+fn main() {
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    fs::write(out.join("memory.x"), include_bytes!("memory.x")).unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // Only link CCM script when the feature is enabled.
+    // Enable with: cargo build --features ccmram
+    if env::var_os("CARGO_FEATURE_CCMRAM").is_some() {
+        fs::write(out.join("ccmram.x"), include_bytes!("ccmram.x")).unwrap();
+        println!("cargo:rustc-link-arg=-Tccmram.x");
+    }
+}