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GB: Start building up MGB

This commit is contained in:
Vicki Pfau 2017-08-05 07:57:23 -07:00
parent 3203159123
commit a496ddc072
2 changed files with 37 additions and 2 deletions
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1
include/mgba/internal/gb/audio.h
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@ -142,6 +142,7 @@ struct GBAudioNoiseChannel {
enum GBAudioStyle {
GB_AUDIO_DMG,
GB_AUDIO_MGB = GB_AUDIO_DMG, // TODO
GB_AUDIO_CGB,
GB_AUDIO_AGB, // GB in GBA
GB_AUDIO_GBA, // GBA PSG

38
src/gb/gb.c
View File

@ -28,6 +28,7 @@ static const uint8_t _knownHeader[4] = { 0xCE, 0xED, 0x66, 0x66};
#define DMG_BIOS_CHECKSUM 0xC2F5CC97
#define DMG_2_BIOS_CHECKSUM 0x59C8598E
#define MGB_BIOS_CHECKSUM 0xE6920754
#define SGB_BIOS_CHECKSUM 0xEC8A83B9
#define CGB_BIOS_CHECKSUM 0x41884E46
@ -390,6 +391,7 @@ bool GBIsBIOS(struct VFile* vf) {
switch (_GBBiosCRC32(vf)) {
case DMG_BIOS_CHECKSUM:
case DMG_2_BIOS_CHECKSUM:
case MGB_BIOS_CHECKSUM:
case SGB_BIOS_CHECKSUM:
case CGB_BIOS_CHECKSUM:
return true;
@ -434,8 +436,6 @@ void GBReset(struct LR35902Core* cpu) {
switch (gb->model) {
case GB_MODEL_AUTODETECT: // Silence warnings
gb->model = GB_MODEL_DMG;
// TODO: SGB registers
case GB_MODEL_SGB:
case GB_MODEL_DMG:
cpu->a = 1;
cpu->f.packed = 0xB0;
@ -445,6 +445,33 @@ void GBReset(struct LR35902Core* cpu) {
cpu->l = 0x4D;
gb->timer.internalDiv = 0x2AF3;
break;
case GB_MODEL_SGB:
cpu->a = 1;
cpu->f.packed = 0x00;
cpu->c = 0x14;
cpu->e = 0x00;
cpu->h = 0xC0;
cpu->l = 0x60;
gb->timer.internalDiv = 0x2AF3;
break;
case GB_MODEL_MGB:
cpu->a = 0xFF;
cpu->f.packed = 0xB0;
cpu->c = 0x13;
cpu->e = 0xD8;
cpu->h = 1;
cpu->l = 0x4D;
gb->timer.internalDiv = 0x2AF3;
break;
case GB_MODEL_SGB2:
cpu->a = 0xFF;
cpu->f.packed = 0x00;
cpu->c = 0x14;
cpu->e = 0x00;
cpu->h = 0xC0;
cpu->l = 0x60;
gb->timer.internalDiv = 0x2AF3;
break;
case GB_MODEL_AGB:
cpu->b = 1;
// Fall through
@ -502,6 +529,9 @@ void GBDetectModel(struct GB* gb) {
case DMG_2_BIOS_CHECKSUM:
gb->model = GB_MODEL_DMG;
break;
case MGB_BIOS_CHECKSUM:
gb->model = GB_MODEL_MGB;
break;
case SGB_BIOS_CHECKSUM:
gb->model = GB_MODEL_SGB;
break;
@ -530,6 +560,10 @@ void GBDetectModel(struct GB* gb) {
case GB_MODEL_AUTODETECT: //Silence warnings
gb->audio.style = GB_AUDIO_DMG;
break;
case GB_MODEL_MGB:
case GB_MODEL_SGB2:
gb->audio.style = GB_AUDIO_MGB;
break;
case GB_MODEL_AGB:
case GB_MODEL_CGB:
gb->audio.style = GB_AUDIO_CGB;