wrote some ffi functions and interfaces

tested the fact that the rust library could be used in a embedded application

libautobar/Cargo.toml

@@ -1,8 +1,11 @@
 [package]
 name = "libautobar"
-version = "0.1.0"
+version = "0.0.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[lib]
+name = "autobar"
+crate-type = ["staticlib"]
 
 [dependencies]

libautobar/src/lib.rs

@@ -1,3 +1,26 @@
+#![no_std]
+
+use core::panic::PanicInfo;
+
+#[panic_handler]
+fn panik(_panic_state: &PanicInfo) -> ! {
+    loop {}
+}
+
+extern {
+    fn gpio_put_explict(pin: i32, status: bool) -> i32;
+    fn sleep_ms(time: i32) -> i32;
+}
+
+#[no_mangle]
+pub extern "C" fn set_and_sleep(pin: i32, status: bool, time: i32) -> () {
+    unsafe {
+        gpio_put_explict(pin, status);
+        sleep_ms(time);
+    }
+}
+
+// this is just a mock test, supposed to pass
 #[cfg(test)]
 mod tests {
     #[test]