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chore: allow 8-bit IO to BG0CNT and BG1CNT 

BG0CNT and and BG1CNT now work properly in mario kart
This commit is contained in:
Rekai Nyangadzayi Musuka 2022-05-01 20:41:00 -03:00
parent c2f55e0bfb
commit 46ac1542a6
1 changed files with 14 additions and 0 deletions
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14
src/bus/io.zig
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@ -77,6 +77,7 @@ pub fn read(bus: *const Bus, comptime T: type, address: u32) T {
0x0400_000A => bus.ppu.bg[1].cnt.raw,
0x0400_000C => bus.ppu.bg[2].cnt.raw,
0x0400_000E => bus.ppu.bg[3].cnt.raw,
0x0400_004C => unimplementedRead("Read {} from MOSAIC", .{T}),
// Sound
0x0400_0088 => bus.apu.bias.raw,
@ -117,7 +118,12 @@ pub fn read(bus: *const Bus, comptime T: type, address: u32) T {
// Display
0x0400_0000 => @truncate(T, bus.ppu.dispcnt.raw),
0x0400_0004 => @truncate(T, bus.ppu.dispstat.raw),
0x0400_0005 => @truncate(T, bus.ppu.dispcnt.raw >> 8),
0x0400_0006 => @truncate(T, bus.ppu.vcount.raw),
0x0400_0008 => @truncate(T, bus.ppu.bg[0].cnt.raw),
0x0400_0009 => @truncate(T, bus.ppu.bg[0].cnt.raw >> 8),
0x0400_000A => @truncate(T, bus.ppu.bg[1].cnt.raw),
0x0400_000B => @truncate(T, bus.ppu.bg[1].cnt.raw >> 8),
// Sound
0x0400_0060 => bus.apu.ch1.sweep.raw,
@ -133,6 +139,9 @@ pub fn read(bus: *const Bus, comptime T: type, address: u32) T {
// Serial Communication 1
0x0400_0128 => unimplementedRead("Read {} from SIOCNT_L", .{T}),
// Serial Communication 2
0x0400_0135 => unimplementedRead("Read {} from RCNT_H", .{T}),
// Interrupts
0x0400_0200 => @truncate(T, bus.io.ie.raw),
0x0400_0300 => @enumToInt(bus.io.postflg),
@ -365,6 +374,10 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
// Display
0x0400_0004 => bus.ppu.dispstat.raw = (bus.ppu.dispstat.raw & 0xFF00) | value,
0x0400_0005 => bus.ppu.dispstat.raw = (@as(u16, value) << 8) | (bus.ppu.dispstat.raw & 0xFF),
0x0400_0008 => bus.ppu.bg[0].cnt.raw = (bus.ppu.bg[0].cnt.raw & 0xFF00) | value,
0x0400_0009 => bus.ppu.bg[0].cnt.raw = (@as(u16, value) << 8) | (bus.ppu.bg[0].cnt.raw & 0xFF),
0x0400_000A => bus.ppu.bg[1].cnt.raw = (bus.ppu.bg[1].cnt.raw & 0xFF00) | value,
0x0400_000B => bus.ppu.bg[1].cnt.raw = (@as(u16, value) << 8) | (bus.ppu.bg[1].cnt.raw & 0xFF),
0x0400_0054 => log.debug("Wrote 0x{X:0>2} to BLDY_L", .{value}),
// Sound
@ -401,6 +414,7 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
0x0400_0128 => log.debug("Wrote 0x{X:0>2} to SIOCNT_L", .{value}),
// Serial Communication 2
0x0400_0135 => log.debug("Wrote 0x{X:0>2} to RCNT_H", .{value}),
0x0400_0140 => log.debug("Wrote 0x{X:0>2} to JOYCNT_L", .{value}),
// Interrupts