83 lines
2.3 KiB
Zig
83 lines
2.3 KiB
Zig
const std = @import("std");
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const bitfield = @import("bitfield");
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const Bitfield = bitfield.Bitfield;
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const Bit = bitfield.Bit;
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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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vcount: VCount,
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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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};
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}
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pub fn read32(self: *const Self, addr: u32) u32 {
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return switch (addr) {
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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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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 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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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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pub fn write16(self: *Self, addr: u32, halfword: u16) void {
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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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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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pub fn read8(self: *const Self, addr: u32) u8 {
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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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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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};
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const DispCnt = 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_interraw_free: Bit(u16, 5),
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obj_mapping: Bit(u16, 6),
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forced_blank: Bit(u16, 7),
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bg_enable: Bitfield(u16, 8, 4),
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obj_enable: Bit(u16, 12),
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win_enable: Bitfield(u16, 13, 2),
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obj_win_enable: Bit(u16, 15),
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raw: u16,
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};
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const DispStat = extern union {
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vblank: Bit(u16, 0),
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hblank: Bit(u16, 1),
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vcount: Bit(u16, 2),
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vblank_irq: Bit(u16, 3),
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hblank_irq: Bit(u16, 4),
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vcount_irq: Bit(u16, 5),
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vcount_setting: Bitfield(u16, 8, 7),
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raw: u16,
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};
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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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