fix(serial): now wait instead of kernel panick on serial !EMPTY_TRANSMITTER

Signed-off-by: Julien CLEMENT <julien.clement@epita.fr>

src/lib.rs

@@ -29,11 +29,7 @@ pub fn init() {
 pub extern "C" fn julios_main() -> ! {
     init();
     println!("***JuliOS V0.1.0***");
-    fn stack_overflow() {
-        stack_overflow(); // for each recursion, the return address is pushed
-    }
-
-    stack_overflow();
+    serial_println!("Hello serial");
 
     panic!("Kernel end of flow");
 }

src/serial.rs

@@ -93,9 +93,9 @@ impl SerialPort {
     fn write_string(&mut self, s: &str) -> usize {
         let mut len: usize = 0;
         for byte in s.bytes() {
-            let written: bool = self.write_byte(byte);
-            if !written {
-                return len;
+            let mut written: bool = self.write_byte(byte);
+            while !written {
+                written = self.write_byte(byte);
             }
             len += 1;
         }