add println macro for mgba

agb/examples/output.rs

@@ -5,7 +5,6 @@ extern crate agb;
 #[no_mangle]
 pub fn main() -> ! {
     let mut gba = agb::Gba::new();
-    let mut mgba = agb::mgba::Mgba::new().unwrap();
 
     let vblank = gba.display.vblank.get();
 
@@ -13,11 +12,7 @@ pub fn main() -> ! {
     loop {
         vblank.wait_for_VBlank();
 
-        mgba.print(
+        agb::println!("Hello, world, frame = {}", count);
-            format_args!("Hello, world, frame = {}", count),
-            agb::mgba::DebugLevel::Info,
-        )
-        .unwrap();
 
         count += 1;
     }

agb/src/mgba.rs

@@ -78,3 +78,14 @@ impl core::fmt::Write for Mgba {
         Ok(())
     }
 }
+
+#[macro_export]
+macro_rules! println {
+    ($( $x:expr ),*) => {
+        {
+            if let Some(mut mgba) = $crate::mgba::Mgba::new() {
+                let _ = mgba.print(format_args!($($x,)*), $crate::mgba::DebugLevel::Info);
+            }
+        }
+    };
+}