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feat: implement open bus for unmapped i/o

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-10-21 05:12:58 -03:00
parent 5fb5247d0e
commit fad5c9e632
7 changed files with 78 additions and 58 deletions
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17
src/core/apu.zig
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@@ -1,6 +1,7 @@
const std = @import("std");
const SDL = @import("sdl2");
const io = @import("bus/io.zig");
const util = @import("util.zig");
const Arm7tdmi = @import("cpu.zig").Arm7tdmi;
const Scheduler = @import("scheduler.zig").Scheduler;
@@ -9,13 +10,11 @@ const SoundFifo = std.fifo.LinearFifo(u8, .{ .Static = 0x20 });
const AudioDeviceId = SDL.SDL_AudioDeviceID;
const intToBytes = @import("util.zig").intToBytes;
const readUndefined = @import("util.zig").readUndefined;
const writeUndefined = @import("util.zig").writeUndefined;
const log = std.log.scoped(.APU);
pub const host_sample_rate = 1 << 15;
pub fn read(comptime T: type, apu: *const Apu, addr: u32) T {
pub fn read(comptime T: type, apu: *const Apu, addr: u32) ?T {
const byte = @truncate(u8, addr);
return switch (T) {
@@ -38,7 +37,7 @@ pub fn read(comptime T: type, apu: *const Apu, addr: u32) T {
0x84 => apu.getSoundCntX(),
0x88 => apu.bias.raw, // SOUNDBIAS
0x90...0x9F => apu.ch3.wave_dev.read(T, apu.ch3.select, addr),
else => readUndefined(log, "Tried to perform a {} read to 0x{X:0>8}", .{ T, addr }),
else => util.io.read.undef(T, log, "Tried to perform a {} read to 0x{X:0>8}", .{ T, addr }),
},
u8 => switch (byte) {
0x60 => apu.ch1.getSoundCntL(), // NR10
@@ -52,9 +51,9 @@ pub fn read(comptime T: type, apu: *const Apu, addr: u32) T {
0x81 => @truncate(u8, apu.psg_cnt.raw >> 8), // NR51
0x84 => apu.getSoundCntX(),
0x89 => @truncate(u8, apu.bias.raw >> 8), // SOUNDBIAS_H
else => readUndefined(log, "Tried to perform a {} read to 0x{X:0>8}", .{ T, addr }),
else => util.io.read.undef(T, log, "Tried to perform a {} read to 0x{X:0>8}", .{ T, addr }),
},
u32 => readUndefined(log, "Tried to perform a {} read to 0x{X:0>8}", .{ T, addr }),
u32 => util.io.read.undef(T, log, "Tried to perform a {} read to 0x{X:0>8}", .{ T, addr }),
else => @compileError("APU: Unsupported read width"),
};
}
@@ -78,7 +77,7 @@ pub fn write(comptime T: type, apu: *Apu, addr: u32, value: T) void {
0x90...0x9F => apu.ch3.wave_dev.write(T, apu.ch3.select, addr, value),
0xA0 => apu.chA.push(value), // FIFO_A
0xA4 => apu.chB.push(value), // FIFO_B
else => writeUndefined(log, "Tried to write 0x{X:0>8}{} to 0x{X:0>8}", .{ value, T, addr }),
else => util.io.write.undef(log, "Tried to write 0x{X:0>8}{} to 0x{X:0>8}", .{ value, T, addr }),
},
u16 => switch (byte) {
0x60 => apu.ch1.setSoundCntL(@truncate(u8, value)), // SOUND1CNT_L
@@ -101,7 +100,7 @@ pub fn write(comptime T: type, apu: *Apu, addr: u32, value: T) void {
0x88 => apu.bias.raw = value, // SOUNDBIAS
// WAVE_RAM
0x90...0x9F => apu.ch3.wave_dev.write(T, apu.ch3.select, addr, value),
else => writeUndefined(log, "Tried to write 0x{X:0>4}{} to 0x{X:0>8}", .{ value, T, addr }),
else => util.io.write.undef(log, "Tried to write 0x{X:0>4}{} to 0x{X:0>8}", .{ value, T, addr }),
},
u8 => switch (byte) {
0x60 => apu.ch1.setSoundCntL(value),
@@ -133,7 +132,7 @@ pub fn write(comptime T: type, apu: *Apu, addr: u32, value: T) void {
0x84 => apu.setSoundCntX(value >> 7 & 1 == 1), // NR52
0x89 => apu.setSoundBiasH(value),
0x90...0x9F => apu.ch3.wave_dev.write(T, apu.ch3.select, addr, value),
else => writeUndefined(log, "Tried to write 0x{X:0>2}{} to 0x{X:0>8}", .{ value, T, addr }),
else => util.io.write.undef(log, "Tried to write 0x{X:0>2}{} to 0x{X:0>8}", .{ value, T, addr }),
},
else => @compileError("APU: Unsupported write width"),
}