First commit

build.rs

@@ -0,0 +1,26 @@
+use std::path::PathBuf;
+
+use embuild::{
+    self, bingen,
+    build::{CfgArgs, LinkArgs},
+    cargo, symgen,
+};
+
+// Necessary because of this issue: https://github.com/rust-lang/cargo/issues/9641
+fn main() -> anyhow::Result<()> {
+    LinkArgs::output_propagated("ESP_IDF")?;
+
+    let cfg = CfgArgs::try_from_env("ESP_IDF")?;
+
+    if cfg.get("esp32s2").is_some() {
+        let ulp_elf = PathBuf::from("ulp").join("rust-esp32-ulp-hello");
+        symgen::run(&ulp_elf, 0x5000_0000)?; // This is where the RTC Slow Mem is mapped within the ESP32-S2 memory space
+        bingen::run(&ulp_elf)?;
+
+        cargo::track_file(ulp_elf);
+    }
+
+    cfg.output();
+
+    Ok(())
+}