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+ "zerofrom",
+ "zerovec-derive",
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diff --git a/Cargo.toml b/Cargo.toml
index a9b00fe..2642907 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,3 +10,7 @@ name = "usb3sun"
 edition = "2021"
 crate-type = ["staticlib"]
 required-features = []
+
+[build-dependencies]
+bindgen = "0.69.5"
+embuild = { git = "https://github.com/delan/embuild.git", branch = "pio-native", version = "0.32.0", features = ["bindgen", "pio"] }
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..9200ab3
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,14 @@
+use std::error::Error;
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let scons_variables = embuild::pio::project::SconsVariables::from_piofirst()
+        .expect("Failed to get scons variables");
+    let factory = embuild::bindgen::Factory::from_scons_vars(&scons_variables)?;
+
+    // thread 'main' panicked at [...]/.cargo/registry/src/index.crates.io-6f17d22bba15001f/bindgen-0.69.5/ir/context.rs:556:15:
+    // libclang error; [...]
+    // embuild::bindgen::run(factory.builder()?)?;
+    drop(factory);
+
+    Ok(())
+}
diff --git a/shell.nix b/shell.nix
index 35aa543..796e685 100644
--- a/shell.nix
+++ b/shell.nix
@@ -56,5 +56,9 @@ in
   # clear LD_LIBRARY_PATH (NixOS/nixpkgs#263201, NixOS/nixpkgs#262775, NixOS/nixpkgs#262080)
   # then add path for platformio debugging in vscode
   # (ldd ~/.platformio/packages/toolchain-rp2040-earlephilhower/bin/arm-none-eabi-gdb)
-  runScript = "env LD_LIBRARY_PATH=${pkgs.lib.makeLibraryPath [ pkgs.ncurses5 ]} bash";
+  runScript = "env LD_LIBRARY_PATH=${
+    pkgs.lib.makeLibraryPath [ pkgs.ncurses5 ]
+  } LIBCLANG_PATH=${
+    pkgs.lib.makeLibraryPath [ pkgs.llvmPackages.clang-unwrapped.lib ]
+  } bash";
 }).env
diff --git a/src/lib.rs b/src/lib.rs
index 9b32301..9f1e309 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,19 +1,27 @@
 #![cfg_attr(target_os = "none", no_std)]
 
+use core::ffi::{c_char, CStr};
+
 #[cfg(target_os = "none")]
 #[panic_handler]
 fn panic(_info: &core::panic::PanicInfo) -> ! {
     loop {}
 }
 
-//
-// Entry points
-//
-
-#[no_mangle]
-extern "C" fn arduino_setup() {
+extern "C" {
+    fn usb3sun_debug_write(data: *const c_char, len: u32) -> bool;
 }
 
 #[no_mangle]
-extern "C" fn arduino_loop() {
+extern "C" fn hello_rust() {
+    let data = CStr::from_bytes_with_nul(b"hello from rust!\n\0").expect("guaranteed by argument");
+    let len = data
+        .count_bytes()
+        .checked_add(1)
+        .expect("length overflow on add");
+    let len = len.try_into().expect("length overflow");
+
+    unsafe {
+        usb3sun_debug_write(data.as_ptr(), len);
+    }
 }
diff --git a/src/main.cc b/src/main.cc
index 29f7956..8d1381e 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -148,9 +148,11 @@ struct DefaultView : View {
 
 static DefaultView DEFAULT_VIEW{};
 
+extern "C" void hello_rust();
 void setup() {
   // pico led on, then configure pin modes
   pinout.begin();
+  hello_rust();
   Sprintln("usb3sun " USB3SUN_VERSION);
   Sprintf("pinout: v%zu\n", usb3sun_pinout_version());