99 lines
2.9 KiB
Rust
99 lines
2.9 KiB
Rust
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// from https://github.com/rust-console/gba/blob/main/examples/hello.rs
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#![no_std]
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#![no_main]
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use core::fmt::Write;
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use gba::prelude::*;
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#[panic_handler]
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fn panic_handler(info: &core::panic::PanicInfo) -> ! {
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#[cfg(debug_assertions)]
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if let Ok(mut logger) = MgbaBufferedLogger::try_new(MgbaMessageLevel::Fatal) {
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writeln!(logger, "{info}").ok();
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}
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loop {}
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}
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#[link_section = ".ewram"]
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static FRAME_KEYS: GbaCell<KeyInput> = GbaCell::new(KeyInput::new());
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#[link_section = ".iwram"]
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extern "C" fn irq_handler(_: IrqBits) {
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// We'll read the keys during vblank and store it for later.
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FRAME_KEYS.write(KEYINPUT.read());
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}
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#[no_mangle]
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extern "C" fn main() -> ! {
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RUST_IRQ_HANDLER.write(Some(irq_handler));
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DISPSTAT.write(DisplayStatus::new().with_irq_vblank(true));
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IE.write(IrqBits::VBLANK);
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IME.write(true);
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if let Ok(mut logger) = MgbaBufferedLogger::try_new(MgbaMessageLevel::Debug) {
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writeln!(logger, "hello!").ok();
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let fx_u: Fixed<u32, 8> = Fixed::<u32, 8>::wrapping_from(7) + Fixed::<u32, 8>::from_raw(12);
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writeln!(logger, "fixed unsigned: {fx_u:?}").ok();
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let fx_i1: Fixed<i32, 8> =
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Fixed::<i32, 8>::wrapping_from(8) + Fixed::<i32, 8>::from_raw(15);
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writeln!(logger, "fixed signed positive: {fx_i1:?}").ok();
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let fx_i2: Fixed<i32, 8> = Fixed::<i32, 8>::wrapping_from(0)
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- Fixed::<i32, 8>::wrapping_from(3)
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- Fixed::<i32, 8>::from_raw(17);
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writeln!(logger, "fixed signed negative: {fx_i2:?}").ok();
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}
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{
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// get our tile data into memory.
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Cga8x8Thick.bitunpack_4bpp(CHARBLOCK0_4BPP.as_region(), 0);
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}
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{
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// set up the tilemap
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let tsb = TEXT_SCREENBLOCKS.get_frame(31).unwrap();
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for y in 0..16 {
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let row = tsb.get_row(y).unwrap();
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for (x, addr) in row.iter().enumerate().take(16) {
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let te = TextEntry::new().with_tile((y * 16 + x) as u16);
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addr.write(te);
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}
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}
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}
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{
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// Set BG0 to use the tilemap we just made, and set it to be shown.
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BG0CNT.write(BackgroundControl::new().with_screenblock(31));
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DISPCNT.write(DisplayControl::new().with_show_bg0(true));
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}
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let mut x_off = 0_u32;
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let mut y_off = 0_u32;
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let mut backdrop_color = Color(0);
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loop {
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VBlankIntrWait();
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// show current frame
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BACKDROP_COLOR.write(backdrop_color);
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BG0HOFS.write(x_off as u16);
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BG0VOFS.write(y_off as u16);
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// prep next frame
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let k = FRAME_KEYS.read();
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backdrop_color = Color(k.to_u16());
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if k.up() {
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y_off = y_off.wrapping_add(1);
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}
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if k.down() {
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y_off = y_off.wrapping_sub(1);
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}
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if k.left() {
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x_off = x_off.wrapping_add(1);
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}
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if k.right() {
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x_off = x_off.wrapping_sub(1);
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}
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}
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}
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