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GB Audio: Fix up boot sequence

This commit is contained in:
Vicki Pfau 2022-12-11 19:08:53 -08:00
parent 4f70b313fc
commit 50fd46506c
4 changed files with 22 additions and 32 deletions
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1
CHANGES
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@ -5,6 +5,7 @@ Features:
Emulation fixes:
- GB Audio: Fix channels 1/2 not playing when resetting volume (fixes mgba.io/i/2614)
- GB Audio: Fix channel 3 volume being changed between samples (fixes mgba.io/i/1896)
- GB Audio: Fix up boot sequence
- GB Memory: Actually, HDMAs should start when LCD is off (fixes mgba.io/i/2662)
- GB Serialize: Don't write BGP/OBP when loading SCGB state (fixes mgba.io/i/2694)
- GB SIO: Further fix bidirectional transfer starting

1
src/gb/audio.c
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@ -116,7 +116,6 @@ void GBAudioReset(struct GBAudio* audio) {
audio->ch3.wavedata8[13] = 0xFF;
audio->ch3.wavedata8[14] = 0x00;
audio->ch3.wavedata8[15] = 0xFF;
audio->ch3.window = 0;
audio->ch4 = (struct GBAudioNoiseChannel) { .envelope = { .dead = 2 } };
audio->frame = 0;
audio->sampleInterval = SAMPLE_INTERVAL * GB_MAX_SAMPLES;

21
src/gb/gb.c
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@ -596,13 +596,13 @@ void GBReset(struct SM83Core* cpu) {
GBVideoReset(&gb->video);
GBTimerReset(&gb->timer);
GBIOReset(gb);
GBAudioReset(&gb->audio);
if (!gb->biosVf && gb->memory.rom) {
GBSkipBIOS(gb);
} else {
mTimingSchedule(&gb->timing, &gb->timer.event, 0);
}
GBAudioReset(&gb->audio);
GBSIOReset(&gb->sio);
cpu->memory.setActiveRegion(cpu, cpu->pc);
@ -744,6 +744,25 @@ void GBSkipBIOS(struct GB* gb) {
GBUnmapBIOS(gb);
}
GBIOWrite(gb, GB_REG_NR52, 0xF1);
GBIOWrite(gb, GB_REG_NR14, 0x3F);
GBIOWrite(gb, GB_REG_NR10, 0x80);
GBIOWrite(gb, GB_REG_NR11, 0xBF);
GBIOWrite(gb, GB_REG_NR12, 0xF3);
GBIOWrite(gb, GB_REG_NR13, 0xF3);
GBIOWrite(gb, GB_REG_NR24, 0x3F);
GBIOWrite(gb, GB_REG_NR21, 0x3F);
GBIOWrite(gb, GB_REG_NR22, 0x00);
GBIOWrite(gb, GB_REG_NR34, 0x3F);
GBIOWrite(gb, GB_REG_NR30, 0x7F);
GBIOWrite(gb, GB_REG_NR31, 0xFF);
GBIOWrite(gb, GB_REG_NR32, 0x9F);
GBIOWrite(gb, GB_REG_NR44, 0x3F);
GBIOWrite(gb, GB_REG_NR41, 0xFF);
GBIOWrite(gb, GB_REG_NR42, 0x00);
GBIOWrite(gb, GB_REG_NR43, 0x00);
GBIOWrite(gb, GB_REG_NR50, 0x77);
GBIOWrite(gb, GB_REG_NR51, 0xF3);
GBIOWrite(gb, GB_REG_LCDC, 0x91);
gb->memory.io[GB_REG_BANK] = 0x1;
GBVideoSkipBIOS(&gb->video);

29
src/gb/io.c
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@ -162,36 +162,7 @@ void GBIOReset(struct GB* gb) {
GBIOWrite(gb, GB_REG_TMA, 0);
GBIOWrite(gb, GB_REG_TAC, 0);
GBIOWrite(gb, GB_REG_IF, 1);
gb->audio.playingCh1 = false;
gb->audio.playingCh2 = false;
gb->audio.playingCh3 = false;
gb->audio.playingCh4 = false;
GBIOWrite(gb, GB_REG_NR52, 0xF1);
GBIOWrite(gb, GB_REG_NR14, 0x3F);
GBIOWrite(gb, GB_REG_NR10, 0x80);
GBIOWrite(gb, GB_REG_NR11, 0xBF);
GBIOWrite(gb, GB_REG_NR12, 0xF3);
GBIOWrite(gb, GB_REG_NR13, 0xF3);
GBIOWrite(gb, GB_REG_NR24, 0x3F);
GBIOWrite(gb, GB_REG_NR21, 0x3F);
GBIOWrite(gb, GB_REG_NR22, 0x00);
GBIOWrite(gb, GB_REG_NR34, 0x3F);
GBIOWrite(gb, GB_REG_NR30, 0x7F);
GBIOWrite(gb, GB_REG_NR31, 0xFF);
GBIOWrite(gb, GB_REG_NR32, 0x9F);
GBIOWrite(gb, GB_REG_NR44, 0x3F);
GBIOWrite(gb, GB_REG_NR41, 0xFF);
GBIOWrite(gb, GB_REG_NR42, 0x00);
GBIOWrite(gb, GB_REG_NR43, 0x00);
GBIOWrite(gb, GB_REG_NR50, 0x77);
GBIOWrite(gb, GB_REG_NR51, 0xF3);
if (!gb->biosVf) {
GBIOWrite(gb, GB_REG_LCDC, 0x91);
gb->memory.io[GB_REG_BANK] = 1;
} else {
GBIOWrite(gb, GB_REG_LCDC, 0x00);
gb->memory.io[GB_REG_BANK] = 0xFF;
}
GBIOWrite(gb, GB_REG_SCY, 0x00);
GBIOWrite(gb, GB_REG_SCX, 0x00);
GBIOWrite(gb, GB_REG_LYC, 0x00);