mirror of
https://github.com/italicsjenga/gba.git
synced 2024-12-23 19:01:30 +11:00
35 lines
826 B
Rust
35 lines
826 B
Rust
#![feature(start)]
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#![no_std]
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#[cfg(not(test))]
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#[panic_handler]
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fn panic(_info: &core::panic::PanicInfo) -> ! {
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loop {}
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}
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#[start]
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fn main(_argc: isize, _argv: *const *const u8) -> isize {
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unsafe {
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DISPCNT.write_volatile(MODE3 | BG2);
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mode3_pixel(120, 80, rgb16(31, 0, 0));
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mode3_pixel(136, 80, rgb16(0, 31, 0));
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mode3_pixel(120, 96, rgb16(0, 0, 31));
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loop {}
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}
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}
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pub const DISPCNT: *mut u16 = 0x04000000 as *mut u16;
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pub const MODE3: u16 = 3;
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pub const BG2: u16 = 0b100_0000_0000;
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pub const VRAM: usize = 0x06000000;
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pub const SCREEN_WIDTH: isize = 240;
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pub const fn rgb16(red: u16, green: u16, blue: u16) -> u16 {
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blue << 10 | green << 5 | red
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}
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pub unsafe fn mode3_pixel(col: isize, row: isize, color: u16) {
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(VRAM as *mut u16).offset(col + row * SCREEN_WIDTH).write_volatile(color);
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}
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