chore(io): implement IE and IME
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769c67b9d4
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@ -69,7 +69,7 @@ pub fn write32(self: *Self, addr: u32, word: u32) void {
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// General Internal Memory
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0x0200_0000...0x0203_FFFF => self.iwram.set32(addr - 0x0200_0000, word),
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0x0300_0000...0x0300_7FFF => self.ewram.set32(addr - 0x0300_0000, word),
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0x0400_0000...0x0400_03FE => std.debug.panic("[Bus:32] wrote 0x{X:} to 0x{X:} in I/O", .{ word, addr }),
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0x0400_0000...0x0400_03FE => self.io.write32(addr, word),
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// Internal Display Memory
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0x0500_0000...0x0500_03FF => self.ppu.palette.set32(@as(usize, addr - 0x0500_0000), word),
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@ -153,7 +153,7 @@ pub fn write8(self: *Self, addr: u32, byte: u8) void {
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// General Internal Memory
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0x0200_0000...0x0203_FFFF => self.iwram.set8(addr - 0x0200_0000, byte),
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0x0300_0000...0x0300_7FFF => self.ewram.set8(addr - 0x0300_0000, byte),
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0x0400_0000...0x0400_03FE => self.io.set8(addr - 0x0400_0000, byte),
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0x0400_0000...0x0400_03FE => self.io.write8(addr, byte),
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// External Memory (Game Pak)
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0x0E00_0000...0x0E00_FFFF => std.debug.panic("[Bus:8] write 0x{X:} to 0x{X:} in Game Pak SRAM", .{ byte, addr }),
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@ -6,15 +6,20 @@ const Bitfield = @import("bitfield").Bitfield;
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pub const Io = struct {
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const Self = @This();
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dispcnt: DispCnt,
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dispstat: DispStat,
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dispcnt: DisplayControl,
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dispstat: DisplayStatus,
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vcount: VCount,
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/// Read / Write
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ime: bool,
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ie: InterruptEnable,
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pub fn init() Self {
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return .{
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.dispcnt = .{ .raw = 0x0000_0000 },
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.dispstat = .{ .raw = 0x0000_0000 },
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.vcount = .{ .raw = 0x0000_0000 },
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.ime = false,
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.ie = .{ .raw = 0x0000_0000 },
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};
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}
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@ -23,15 +28,27 @@ pub const Io = struct {
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0x0400_0000 => @as(u32, self.dispcnt.raw),
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0x0400_0004 => @as(u32, self.dispstat.raw),
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0x0400_0006 => @as(u32, self.vcount.raw),
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0x0400_0200 => @as(u32, self.ie.raw),
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0x0400_0208 => @boolToInt(self.ime),
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else => std.debug.panic("[I/O:32] tried to read from {X:}", .{addr}),
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};
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}
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pub fn write32(self: *Self, addr: u32, word: u32) void {
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switch (addr) {
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0x0400_0200 => self.ie.raw = @truncate(u16, word),
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0x0400_0208 => self.ime = word & 1 == 1,
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else => std.debug.panic("[I/O:32] tried to write 0x{X:} to 0x{X:}", .{ word, addr }),
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}
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}
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pub fn read16(self: *const Self, addr: u32) u16 {
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return switch (addr) {
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0x0400_0000 => self.dispcnt.raw,
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0x0400_0004 => self.dispstat.raw,
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0x0400_0006 => self.vcount.raw,
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0x0400_0200 => self.ie.raw,
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0x0400_0208 => @boolToInt(self.ime),
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else => std.debug.panic("[I/O:16] tried to read from {X:}", .{addr}),
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};
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}
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@ -40,6 +57,8 @@ pub const Io = struct {
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switch (addr) {
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0x0400_0000 => self.dispcnt.raw = halfword,
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0x0400_0004 => self.dispstat.raw = halfword,
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0x0400_0200 => self.ie.raw = halfword,
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0x0400_0208 => self.ime = halfword & 1 == 1,
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else => std.debug.panic("[I/O:16] tried to write 0x{X:} to 0x{X:}", .{ halfword, addr }),
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}
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}
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@ -48,17 +67,19 @@ pub const Io = struct {
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return switch (addr) {
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0x0400_0000 => @truncate(u8, self.dispcnt.raw),
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0x0400_0004 => @truncate(u8, self.dispstat.raw),
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0x0400_0200 => @truncate(u8, self.ie.raw),
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0x0400_0006 => @truncate(u8, self.vcount.raw),
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else => std.debug.panic("[I/O:8] tried to read from {X:}", .{addr}),
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};
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}
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pub fn set8(_: *Self, addr: u32, byte: u8) void {
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pub fn write8(_: *Self, addr: u32, byte: u8) void {
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std.debug.panic("[I/0:8] tried to write 0x{X:} to 0x{X:}", .{ byte, addr });
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}
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};
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const DispCnt = extern union {
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/// Read / Write
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const DisplayControl = extern union {
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bg_mode: Bitfield(u16, 0, 3),
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frame_select: Bit(u16, 4),
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hblank_interval_free: Bit(u16, 5),
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@ -71,7 +92,8 @@ const DispCnt = extern union {
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raw: u16,
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};
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const DispStat = extern union {
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/// Read / Write
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const DisplayStatus = extern union {
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vblank: Bit(u16, 0),
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hblank: Bit(u16, 1),
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coincidence: Bit(u16, 2),
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@ -82,7 +104,27 @@ const DispStat = extern union {
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raw: u16,
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};
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/// Read Only
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const VCount = extern union {
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scanline: Bitfield(u16, 0, 8),
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raw: u16,
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};
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/// Read / Write
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const InterruptEnable = extern union {
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vblank: Bit(u16, 0),
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hblank: Bit(u16, 1),
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coincidence: Bit(u16, 2),
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tm0_overflow: Bit(u16, 3),
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tm1_overflow: Bit(u16, 4),
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tm2_overflow: Bit(u16, 5),
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tm3_overflow: Bit(u16, 6),
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serial: Bit(u16, 7),
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dma0: Bit(u16, 8),
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dma1: Bit(u16, 9),
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dma2: Bit(u16, 10),
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dma3: Bit(u16, 11),
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keypad: Bit(u16, 12),
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game_pak: Bit(u16, 13),
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raw: u16,
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};
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