Merge branch 'main' of ssh://musuka.dev:2222/paoda/zba
This commit is contained in:
commit
3c8390a248
17
README.md
17
README.md
|
|
@ -13,26 +13,27 @@ An in-progress Gameboy Advance Emulator written in Zig ⚡!
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* [ARM7TDMI Data Sheet](https://www.dca.fee.unicamp.br/cursos/EA871/references/ARM/ARM7TDMIDataSheet.pdf)
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|
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## Compiling
|
||||
Most recently built on Zig [v0.10.0-dev.1037+331cc810d](https://github.com/ziglang/zig/tree/331cc810d)
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Most recently built on Zig [v0.10.0-dev.1659+4dd65316b](https://github.com/ziglang/zig/tree/4dd65316b)
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||||
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||||
### Dependencies
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||||
* [SDL.zig](https://github.com/MasterQ32/SDL.zig)
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* [SDL2](https://www.libsdl.org/download-2.0.php)
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* [zig-clap](https://github.com/Hejsil/zig-clap)
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* [known-folders](https://github.com/ziglibs/known-folders)
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* [`bitfields.zig`](https://github.com/FlorenceOS/Florence/blob/f6044db788d35d43d66c1d7e58ef1e3c79f10d6f/lib/util/bitfields.zig)
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||||
|
||||
`bitfields.zig` from [FlorenceOS](https://github.com/FlorenceOS) is included under `lib/util/bitfield.zig`.
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||||
`SDL.zig` and `zig-clap` are git submodules you can init using `git submodule update --init` from your terminal.
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||||
Use `git submodule update --init` from the project root to pull the git submodules `SDL.zig`, `zig-clap`, and `known-folders`
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On Linux, be sure to have SDL2 installed using whatever package manager your distro uses.
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Be sure to provide SDL2 using:
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* Linux: Your distro's package manager
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* MacOS: ¯\\\_(ツ)_/¯
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||||
* Windows: [`vcpkg`](https://github.com/Microsoft/vcpkg) (install `sdl2:x64-windows`)
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||||
On Windows, it's easiest if you use [`vcpkg`](https://github.com/Microsoft/vcpkg) to install `sdl2:x64-windows`. If not,
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||||
`SDL2.zig` will provide a helpful compile error which should help you get what you need.
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`SDL.zig` will provide a helpful compile error if the zig compiler is unable to find SDL2.
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||||
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On macOS? ¯\\\_(ツ)_/¯ I hope it isn't too hard to compile though.
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Once you've got all the dependencies, run `zig build -Drelease-fast`. The executable is located at `zig-out/bin/`.
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Once you've got all the dependencies, execute `zig build -Drelease-fast`. The executable is located at `zig-out/bin/`.
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## Controls
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Key | Button
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|
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@ -125,6 +125,7 @@ pub fn write16(self: *Self, addr: u32, halfword: u16) void {
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0x0500_0000...0x05FF_FFFF => self.ppu.palette.set16(addr & 0x3FF, halfword),
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0x0600_0000...0x0601_7FFF => self.ppu.vram.set16(addr - 0x0600_0000, halfword),
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0x0700_0000...0x07FF_FFFF => self.ppu.oam.set16(addr & 0x3FF, halfword),
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0x0800_00C4, 0x0800_00C6, 0x0800_00C8 => log.warn("Tried to write 0x{X:0>4} to GPIO", .{halfword}),
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else => undWrite("Tried to write 0x{X:0>4} to 0x{X:0>8}", .{ halfword, addr }),
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}
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35
src/apu.zig
35
src/apu.zig
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@ -43,6 +43,10 @@ pub const Apu = struct {
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self.ch_vol_cnt.raw = (self.ch_vol_cnt.raw & 0xFF00) | byte;
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}
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pub fn setSoundCntLHigh(self: *Self, byte: u8) void {
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self.ch_vol_cnt.raw = @as(u16, byte) << 8 | (self.ch_vol_cnt.raw & 0xFF);
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}
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pub fn setBiasHigh(self: *Self, byte: u8) void {
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self.bias.raw = (@as(u16, byte) << 8) | (self.bias.raw & 0xFF);
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}
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@ -51,9 +55,13 @@ pub const Apu = struct {
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const ToneSweep = struct {
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const Self = @This();
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/// NR10
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sweep: io.Sweep,
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/// NR11
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duty: io.Duty,
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/// NR12
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envelope: io.Envelope,
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/// NR13, NR14
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freq: io.Frequency,
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fn init() Self {
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@ -65,6 +73,10 @@ const ToneSweep = struct {
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};
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}
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pub fn setFreqLow(self: *Self, byte: u8) void {
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self.freq.raw = (self.freq.raw & 0xFF00) | byte;
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}
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pub fn setFreqHigh(self: *Self, byte: u8) void {
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self.freq.raw = (@as(u16, byte) << 8) | (self.freq.raw & 0xFF);
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}
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@ -73,8 +85,11 @@ const ToneSweep = struct {
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const Tone = struct {
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const Self = @This();
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/// NR21
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duty: io.Duty,
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/// NR22
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envelope: io.Envelope,
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/// NR23, NR24
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freq: io.Frequency,
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fn init() Self {
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@ -85,8 +100,12 @@ const Tone = struct {
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};
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}
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pub fn setFreqLow(self: *Self, byte: u8) void {
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self.freq.raw = (self.freq.raw & 0xFF00) | byte;
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}
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pub fn setFreqHigh(self: *Self, byte: u8) void {
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self.freq.raw = (self.freq.raw & 0x00FF) | (@as(u16, byte) << 8);
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self.freq.raw = @as(u16, byte) << 8 | (self.freq.raw & 0xFF);
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}
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};
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@ -94,10 +113,13 @@ const Wave = struct {
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const Self = @This();
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/// Write-only
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/// NR30
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select: io.WaveSelect,
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/// NR31
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length: u8,
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/// NR32
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vol: io.WaveVolume,
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/// NR33, NR34
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freq: io.Frequency,
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fn init() Self {
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@ -108,6 +130,14 @@ const Wave = struct {
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.length = 0,
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};
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}
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pub fn setFreqLow(self: *Self, byte: u8) void {
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self.freq.raw = (self.freq.raw & 0xFF00) | byte;
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}
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pub fn setFreqHigh(self: *Self, byte: u8) void {
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self.freq.raw = @as(u16, byte) << 8 | (self.freq.raw & 0xFF);
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}
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};
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const Noise = struct {
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@ -116,8 +146,11 @@ const Noise = struct {
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/// Write-only
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/// NR41
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len: u6,
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/// NR42
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envelope: io.Envelope,
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/// NR43
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poly: io.PolyCounter,
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/// NR44
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cnt: io.NoiseControl,
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fn init() Self {
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|
|
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@ -23,6 +23,9 @@ pub const Backup = struct {
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title: [12]u8,
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save_path: ?[]const u8,
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// TODO: Implement EEPROM
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flash: Flash,
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pub fn init(alloc: Allocator, kind: BackupKind, title: [12]u8, path: ?[]const u8) !Self {
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const buf_len: usize = switch (kind) {
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.Sram => 0x8000, // 32K
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@ -40,15 +43,14 @@ pub const Backup = struct {
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.kind = kind,
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.title = title,
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.save_path = path,
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.flash = Flash.init(),
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};
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if (backup.save_path) |p| backup.loadSaveFromDisk(p) catch |e| log.err("Failed to load save: {}", .{e});
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if (backup.save_path) |p| backup.loadSaveFromDisk(p) catch |e| log.err("Failed to load save: {}", .{e});
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return backup;
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}
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pub fn guessKind(rom: []const u8) ?BackupKind {
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@setRuntimeSafety(false);
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for (backup_kinds) |needle| {
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const needle_len = needle.str.len;
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||||
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@ -63,7 +65,6 @@ pub const Backup = struct {
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pub fn deinit(self: Self) void {
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if (self.save_path) |path| self.writeSaveToDisk(path) catch |e| log.err("Failed to write save: {}", .{e});
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self.alloc.free(self.buf);
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}
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@ -78,7 +79,7 @@ pub const Backup = struct {
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defer self.alloc.free(file_buf);
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switch (self.kind) {
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.Sram => {
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.Sram, .Flash, .Flash1M => {
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std.mem.copy(u8, self.buf, file_buf);
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log.info("Loaded Save from {s}", .{file_path});
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},
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@ -103,37 +104,70 @@ pub const Backup = struct {
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defer self.alloc.free(file_path);
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switch (self.kind) {
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.Sram => {
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.Sram, .Flash, .Flash1M => {
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const file = try std.fs.createFileAbsolute(file_path, .{});
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defer file.close();
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try file.writeAll(self.buf);
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log.info("Dumped SRAM to {s}", .{file_path});
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log.info("Wrote Save to {s}", .{file_path});
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},
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else => return SaveError.UnsupportedBackupKind,
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}
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}
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pub fn get8(self: *const Self, idx: usize) u8 {
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// TODO: Implement Flash and EEPROM
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switch (self.kind) {
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.Flash => return switch (idx) {
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0x0000 => 0x32, // Panasonic manufacturer ID
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0x0001 => 0x1B, // Panasonic device ID
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else => self.buf[idx],
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.Flash => {
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switch (idx) {
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0x0000 => if (self.flash.id_mode) return 0x32, // Panasonic manufacturer ID
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0x0001 => if (self.flash.id_mode) return 0x1B, // Panasonic device ID
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else => {},
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}
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return self.flash.read(self.buf, idx);
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},
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.Flash1M => return switch (idx) {
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0x0000 => 0x62, // Sanyo manufacturer ID
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0x0001 => 0x13, // Sanyo device ID
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else => self.buf[idx],
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.Flash1M => {
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switch (idx) {
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0x0000 => if (self.flash.id_mode) return 0x62, // Sanyo manufacturer ID
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0x0001 => if (self.flash.id_mode) return 0x13, // Sanyo device ID
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else => {},
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}
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return self.flash.read(self.buf, idx);
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},
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.Eeprom => return self.buf[idx],
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.Sram => return self.buf[idx & 0x7FFF], // 32K SRAM chips are repeated
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.Sram => return self.buf[idx & 0x7FFF], // 32K SRAM chip is mirrored
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}
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}
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pub fn set8(self: *Self, idx: usize, byte: u8) void {
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self.buf[idx] = byte;
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switch (self.kind) {
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.Flash, .Flash1M => {
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if (self.flash.prep_write) return self.flash.write(self.buf, idx, byte);
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if (self.flash.shouldEraseSector(idx, byte)) return self.flash.eraseSector(self.buf, idx);
|
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|
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switch (idx) {
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0x0000 => if (self.kind == .Flash1M and self.flash.set_bank) {
|
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self.flash.bank = @truncate(u1, byte);
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},
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0x5555 => {
|
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if (self.flash.state == .Command) {
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self.flash.handleCommand(self.buf, byte);
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} else if (byte == 0xAA and self.flash.state == .Ready) {
|
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self.flash.state = .Set;
|
||||
} else if (byte == 0xF0) {
|
||||
self.flash.state = .Ready;
|
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}
|
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},
|
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0x2AAA => if (byte == 0x55 and self.flash.state == .Set) {
|
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self.flash.state = .Command;
|
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},
|
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else => {},
|
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}
|
||||
},
|
||||
.Eeprom => self.buf[idx] = byte,
|
||||
.Sram => self.buf[idx & 0x7FFF] = byte,
|
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}
|
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}
|
||||
};
|
||||
|
||||
|
|
@ -145,10 +179,12 @@ const BackupKind = enum {
|
|||
};
|
||||
|
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const Needle = struct {
|
||||
const Self = @This();
|
||||
|
||||
str: []const u8,
|
||||
kind: BackupKind,
|
||||
|
||||
fn init(str: []const u8, kind: BackupKind) @This() {
|
||||
fn init(str: []const u8, kind: BackupKind) Self {
|
||||
return .{
|
||||
.str = str,
|
||||
.kind = kind,
|
||||
|
|
@ -159,3 +195,71 @@ const Needle = struct {
|
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const SaveError = error{
|
||||
UnsupportedBackupKind,
|
||||
};
|
||||
|
||||
const Flash = struct {
|
||||
const Self = @This();
|
||||
|
||||
state: FlashState,
|
||||
|
||||
id_mode: bool,
|
||||
set_bank: bool,
|
||||
prep_erase: bool,
|
||||
prep_write: bool,
|
||||
|
||||
bank: u1,
|
||||
|
||||
fn init() Self {
|
||||
return .{
|
||||
.state = .Ready,
|
||||
.id_mode = false,
|
||||
.set_bank = false,
|
||||
.prep_erase = false,
|
||||
.prep_write = false,
|
||||
.bank = 0,
|
||||
};
|
||||
}
|
||||
|
||||
fn handleCommand(self: *Self, buf: []u8, byte: u8) void {
|
||||
switch (byte) {
|
||||
0x90 => self.id_mode = true,
|
||||
0xF0 => self.id_mode = false,
|
||||
0xB0 => self.set_bank = true,
|
||||
0x80 => self.prep_erase = true,
|
||||
0x10 => {
|
||||
std.mem.set(u8, buf, 0xFF);
|
||||
self.prep_erase = false;
|
||||
},
|
||||
0xA0 => self.prep_write = true,
|
||||
else => std.debug.panic("Unhandled Flash Command: 0x{X:0>2}", .{byte}),
|
||||
}
|
||||
|
||||
self.state = .Ready;
|
||||
}
|
||||
|
||||
fn shouldEraseSector(self: *const Self, idx: usize, byte: u8) bool {
|
||||
return self.prep_erase and idx & 0xFFF == 0x000 and byte == 0x30;
|
||||
}
|
||||
|
||||
fn write(self: *Self, buf: []u8, idx: usize, byte: u8) void {
|
||||
buf[idx + if (self.bank == 1) 0x1000 else @as(usize, 0)] = byte;
|
||||
self.prep_write = false;
|
||||
}
|
||||
|
||||
fn read(self: *const Self, buf: []u8, idx: usize) u8 {
|
||||
return buf[idx + if (self.bank == 1) 0x1000 else @as(usize, 0)];
|
||||
}
|
||||
|
||||
fn eraseSector(self: *Self, buf: []u8, idx: usize) void {
|
||||
const start = (idx & 0xF000) + if (self.bank == 1) 0x1000 else @as(usize, 0);
|
||||
|
||||
std.mem.set(u8, buf[start..][0..0x1000], 0xFF);
|
||||
self.prep_erase = false;
|
||||
self.state = .Ready;
|
||||
}
|
||||
};
|
||||
|
||||
const FlashState = enum {
|
||||
Ready,
|
||||
Set,
|
||||
Command,
|
||||
};
|
||||
|
|
|
|||
|
|
@ -124,6 +124,9 @@ pub fn read16(bus: *const Bus, addr: u32) u16 {
|
|||
// Sound
|
||||
0x0400_0088 => bus.apu.bias.raw,
|
||||
|
||||
// DMA Transfers
|
||||
0x0400_00BA => bus.dma._0.cnt.raw,
|
||||
|
||||
// Timers
|
||||
0x0400_0100 => bus.tim._0.counter(),
|
||||
0x0400_0102 => bus.tim._0.cnt.raw,
|
||||
|
|
@ -221,6 +224,8 @@ pub fn write16(bus: *Bus, addr: u32, halfword: u16) void {
|
|||
|
||||
// Serial Communication 2
|
||||
0x0400_0134 => log.warn("Wrote 0x{X:0>4} to RCNT", .{halfword}),
|
||||
0x0400_0140 => log.warn("Wrote 0x{X:0>4} to JOYCNT", .{halfword}),
|
||||
0x0400_0158 => log.warn("Wrote 0x{X:0>4} to JOYSTAT", .{halfword}),
|
||||
|
||||
// Interrupts
|
||||
0x0400_0200 => bus.io.ie.raw = halfword,
|
||||
|
|
@ -239,6 +244,13 @@ pub fn read8(bus: *const Bus, addr: u32) u8 {
|
|||
0x0400_0006 => @truncate(u8, bus.ppu.vcount.raw),
|
||||
|
||||
// Sound
|
||||
0x0400_0060 => bus.apu.ch1.sweep.raw,
|
||||
0x0400_0063 => bus.apu.ch1.envelope.raw,
|
||||
0x0400_0069 => bus.apu.ch2.envelope.raw,
|
||||
0x0400_0073 => bus.apu.ch3.vol.raw,
|
||||
0x0400_0079 => bus.apu.ch4.envelope.raw,
|
||||
0x0400_007C => bus.apu.ch4.poly.raw,
|
||||
0x0400_0081 => @truncate(u8, bus.apu.ch_vol_cnt.raw >> 8),
|
||||
0x0400_0089 => @truncate(u8, bus.apu.bias.raw >> 8),
|
||||
|
||||
// Serial Communication 1
|
||||
|
|
@ -258,14 +270,26 @@ pub fn write8(bus: *Bus, addr: u32, byte: u8) void {
|
|||
0x0400_0005 => bus.ppu.dispstat.raw = (@as(u16, byte) << 8) | (bus.ppu.dispstat.raw & 0xFF),
|
||||
|
||||
// Sound
|
||||
0x0400_0060 => bus.apu.ch1.sweep.raw = byte,
|
||||
0x0400_0062 => bus.apu.ch1.duty.raw = byte,
|
||||
0x0400_0063 => bus.apu.ch1.envelope.raw = byte,
|
||||
0x0400_0064 => bus.apu.ch1.setFreqLow(byte),
|
||||
0x0400_0065 => bus.apu.ch1.setFreqHigh(byte),
|
||||
0x0400_0068 => bus.apu.ch2.duty.raw = byte,
|
||||
0x0400_0069 => bus.apu.ch2.envelope.raw = byte,
|
||||
0x0400_006C => bus.apu.ch2.setFreqLow(byte),
|
||||
0x0400_006D => bus.apu.ch2.setFreqHigh(byte),
|
||||
0x0400_0070 => bus.apu.ch3.select.raw = byte,
|
||||
0x0400_0072 => bus.apu.ch3.length = byte,
|
||||
0x0400_0073 => bus.apu.ch3.vol.raw = byte,
|
||||
0x0400_0074 => bus.apu.ch3.setFreqLow(byte),
|
||||
0x0400_0075 => bus.apu.ch3.setFreqHigh(byte),
|
||||
0x0400_0078 => bus.apu.ch4.len = @truncate(u6, byte),
|
||||
0x0400_0079 => bus.apu.ch4.envelope.raw = byte,
|
||||
0x0400_007C => bus.apu.ch4.poly.raw = byte,
|
||||
0x0400_007D => bus.apu.ch4.cnt.raw = byte,
|
||||
0x0400_0080 => bus.apu.setSoundCntLLow(byte),
|
||||
0x0400_0081 => bus.apu.setSoundCntLHigh(byte),
|
||||
0x0400_0084 => bus.apu.setSoundCntX(byte >> 7 & 1 == 1),
|
||||
0x0400_0089 => bus.apu.setBiasHigh(byte),
|
||||
|
||||
|
|
|
|||
|
|
@ -43,8 +43,9 @@ pub fn run(kind: RunKind, quit: *Atomic(bool), fps: *FpsAverage, sched: *Schedul
|
|||
}
|
||||
|
||||
pub fn runFrame(sched: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
|
||||
var cycles: u64 = 0;
|
||||
while (cycles < cycles_per_frame) : (cycles += 1) {
|
||||
const frame_end = sched.tick + cycles_per_frame;
|
||||
|
||||
while (sched.tick < frame_end) {
|
||||
sched.tick += 1;
|
||||
_ = cpu.step();
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue