feat: implement Hblank and Vcount Interrupts

Also implemented unique behaviour when writing to IF
2022-02-20 18:40:22 -05:00
parent e5ab8b51a9
commit c2cf2d2965
3 changed files with 67 additions and 14 deletions
--- a/src/bus/io.zig
+++ b/src/bus/io.zig
@@ -105,7 +105,7 @@ pub fn write16(bus: *Bus, addr: u32, halfword: u16) void {
        0x0400_001C => bus.ppu.bg[3].hofs.raw = halfword,
        0x0400_001E => bus.ppu.bg[3].vofs.raw = halfword,
        0x0400_0200 => bus.io.ie.raw = halfword,
-        0x0400_0202 => bus.io.irq.raw = halfword,
+        0x0400_0202 => bus.io.irq.raw &= ~halfword,
        0x0400_0208 => bus.io.ime = halfword & 1 == 1,
        else => std.debug.panic("Tried to write 0x{X:0>4} to 0x{X:0>8}", .{ halfword, addr }),
    }