working with release mode

Makefile

@@ -20,12 +20,12 @@ out/release/%.gba: cargo-release-%
 
 d-%: out/debug/%.gba
 	@OUTNAME=$(patsubst d-%,%,$@)
-	@mgba-qt $<
+	@mgba-qt -l 31 -d -C logToStdout=1 $<
 	@rm -f out/debug/$${OUTNAME}.sav
 
 r-%: out/release/%.gba
 	@OUTNAME=$(patsubst r-%,%,$@)
-	@mgba-qt $<
+	@mgba-qt -l 31 -d -C logToStdout=1 $<
 	@rm -f out/release/$${OUTNAME}.sav
 	
 cargo-release-%: $(RUSTFILES) out/crt0.o

examples/output.rs

@@ -0,0 +1,26 @@
+#![no_std]
+#![feature(start)]
+
+use gba::display::vblank;
+
+extern crate gba;
+#[start]
+fn main(_argc: isize, _argv: *const *const u8) -> isize {
+    let mut gba = gba::Gba::new();
+    let mut mgba = gba::mgba::Mgba::new().unwrap();
+
+    let vblank = gba.display.vblank.get();
+
+    let mut count = 0;
+    loop {
+        vblank.wait_for_VBlank();
+
+        mgba.print(
+            format_args!("Hello, world, frame = {}", count),
+            gba::mgba::DebugLevel::Info,
+        )
+        .unwrap();
+
+        count += 1;
+    }
+}

src/display/tiled0.rs

@@ -0,0 +1,25 @@
+use crate::memory_mapped::MemoryMapped1DArray;
+
+use super::{set_graphics_mode, DisplayMode};
+
+const PALETTE_BACKGROUND: MemoryMapped1DArray<u16, 256> =
+    unsafe { MemoryMapped1DArray::new(0x0500_0000) };
+const PALETTE_SPRITE: MemoryMapped1DArray<u16, 256> =
+    unsafe { MemoryMapped1DArray::new(0x0500_0200) };
+
+#[non_exhaustive]
+pub struct Tiled0 {}
+
+impl Tiled0 {
+    pub(crate) unsafe fn new() -> Self {
+        set_graphics_mode(DisplayMode::Tiled0);
+        Tiled0 {}
+    }
+
+    pub fn set_sprite_palette(&mut self, index: u8, colour: u16) {
+        PALETTE_SPRITE.set(index as usize, colour)
+    }
+    pub fn set_background_palette(&mut self, index: u8, colour: u16) {
+        PALETTE_BACKGROUND.set(index as usize, colour)
+    }
+}

src/display/video.rs

@@ -1,4 +1,4 @@
-use super::{bitmap3::Bitmap3, bitmap4::Bitmap4};
+use super::{bitmap3::Bitmap3, bitmap4::Bitmap4, tiled0::Tiled0};
 
 #[non_exhaustive]
 pub struct Video {}
@@ -13,4 +13,8 @@ impl Video {
     pub fn bitmap4(&mut self) -> Bitmap4 {
         unsafe { Bitmap4::new() }
     }
+
+    pub fn tiled0(&mut self) -> Tiled0 {
+        unsafe { Tiled0::new() }
+    }
 }

src/lib.rs

@@ -8,7 +8,7 @@ pub mod input;
 
 mod interrupt;
 mod memory_mapped;
-mod mgba;
+pub mod mgba;
 mod single;
 
 pub mod syscall;

src/mgba.rs

@@ -1,7 +1,7 @@
-use crate::memory_mapped::MemoryMapped;
+use crate::memory_mapped::{MemoryMapped, MemoryMapped1DArray};
+use core::fmt::Write;
 
 #[derive(Eq, PartialEq, Clone, Copy)]
-#[repr(u16)]
 #[allow(dead_code)]
 pub enum DebugLevel {
     Fatal = 0,
@@ -11,8 +11,9 @@ pub enum DebugLevel {
     Debug = 4,
 }
 
-const OUTPUT: *mut u8 = 0x04FF_F600 as *mut u8;
+const OUTPUT_STRING: MemoryMapped1DArray<u8, 256> =
-const ENABLE: MemoryMapped<u16> = unsafe { MemoryMapped::new(0x04FF_F780) };
+    unsafe { MemoryMapped1DArray::new(0x04FF_F600) };
+const DEBUG_ENABLE: MemoryMapped<u16> = unsafe { MemoryMapped::new(0x04FF_F780) };
 
 const ENABLE_HANDSHAKE_IN: u16 = 0xC0DE;
 const ENABLE_HANDSHAKE_OUT: u16 = 0x1DEA;
@@ -21,8 +22,8 @@ const DEBUG_LEVEL: MemoryMapped<u16> = unsafe { MemoryMapped::new(0x04FF_F700) }
 const DEBUG_FLAG_CODE: u16 = 0x0100;
 
 fn is_running_in_mgba() -> bool {
-    ENABLE.set(ENABLE_HANDSHAKE_IN);
+    DEBUG_ENABLE.set(ENABLE_HANDSHAKE_IN);
-    ENABLE.get() == ENABLE_HANDSHAKE_OUT
+    DEBUG_ENABLE.get() == ENABLE_HANDSHAKE_OUT
 }
 
 pub struct Mgba {
@@ -37,6 +38,16 @@ impl Mgba {
             None
         }
     }
+
+    pub fn print(
+        &mut self,
+        output: core::fmt::Arguments,
+        level: DebugLevel,
+    ) -> Result<(), core::fmt::Error> {
+        write!(self, "{}", output)?;
+        self.set_level(level);
+        Ok(())
+    }
 }
 
 impl Mgba {
@@ -48,18 +59,14 @@ impl Mgba {
 
 impl core::fmt::Write for Mgba {
     fn write_str(&mut self, s: &str) -> Result<(), core::fmt::Error> {
-        unsafe {
+        let mut str_iter = s.bytes();
-            let mut current_location = OUTPUT.add(self.bytes_written);
+        while self.bytes_written < 255 {
-            let mut str_iter = s.bytes();
+            match str_iter.next() {
-            while self.bytes_written < 255 {
+                Some(byte) => {
-                match str_iter.next() {
+                    OUTPUT_STRING.set(self.bytes_written, byte);
-                    Some(byte) => {
+                    self.bytes_written += 1;
-                        current_location.write(byte);
-                        current_location = current_location.offset(1);
-                        self.bytes_written += 1;
-                    }
-                    None => return Ok(()),
                 }
+                None => return Ok(()),
             }
         }
         Ok(())