small comments

mission_rust/src/fsrc/osal/mod.rs

@@ -48,7 +48,12 @@ extern "C" {
 
 
     pub fn gpio_setup() -> ();
-    pub fn gpio_write_pin(pin: u32, data: u32) -> (); // TODO: Is u32 compatible to uint32_t?
+    pub fn gpio_write_pin(pin: u32, data: u32) -> (); /// .
+    // TODO: Is u32 compatible to uint32_t?
+    
+
+
+    /// Reads the value of a gpio pin
     pub fn gpio_read_pin(pin: u32) -> u32;
     pub fn gpio_toggle_pin(pin: u32) -> ();