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GB Memory: HDMAs should not start when LCD is off (fixes #310)

This commit is contained in:
Vicki Pfau 2017-11-05 21:46:10 -08:00
parent 7f9c7706bc
commit 9248dcb07a
4 changed files with 8 additions and 5 deletions
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1
CHANGES
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@ -6,6 +6,7 @@ Bugfixes:
- GBA Cheats: Fix PARv3 slide codes (fixes mgba.io/i/919)
- GBA Video: OBJWIN can change blend params after OBJ is drawn (fixes mgba.io/i/921)
- GBA Savedata: Fix crash when resizing flash
- GB Memory: HDMAs should not start when LCD is off (fixes mgba.io/i/310)
Misc:
- GBA: Improve multiboot image detection
- GB MBC: Remove erroneous bank 0 wrapping

2
include/mgba/internal/gb/memory.h
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@ -177,7 +177,7 @@ int GBCurrentSegment(struct LR35902Core* cpu, uint16_t address);
uint8_t GBView8(struct LR35902Core* cpu, uint16_t address, int segment);
void GBMemoryDMA(struct GB* gb, uint16_t base);
void GBMemoryWriteHDMA5(struct GB* gb, uint8_t value);
uint8_t GBMemoryWriteHDMA5(struct GB* gb, uint8_t value);
void GBPatch8(struct LR35902Core* cpu, uint16_t address, int8_t value, int8_t* old, int segment);

3
src/gb/io.c
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@ -410,8 +410,7 @@ void GBIOWrite(struct GB* gb, unsigned address, uint8_t value) {
// Handled transparently by the registers
break;
case REG_HDMA5:
GBMemoryWriteHDMA5(gb, value);
value &= 0x7F;
value = GBMemoryWriteHDMA5(gb, value);
break;
case REG_BCPS:
gb->video.bcpIndex = value & 0x3F;

7
src/gb/memory.c
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@ -449,7 +449,7 @@ void GBMemoryDMA(struct GB* gb, uint16_t base) {
gb->memory.dmaRemaining = 0xA0;
}
void GBMemoryWriteHDMA5(struct GB* gb, uint8_t value) {
uint8_t GBMemoryWriteHDMA5(struct GB* gb, uint8_t value) {
gb->memory.hdmaSource = gb->memory.io[REG_HDMA1] << 8;
gb->memory.hdmaSource |= gb->memory.io[REG_HDMA2];
gb->memory.hdmaDest = gb->memory.io[REG_HDMA3] << 8;
@ -457,7 +457,7 @@ void GBMemoryWriteHDMA5(struct GB* gb, uint8_t value) {
gb->memory.hdmaSource &= 0xFFF0;
if (gb->memory.hdmaSource >= 0x8000 && gb->memory.hdmaSource < 0xA000) {
mLOG(GB_MEM, GAME_ERROR, "Invalid HDMA source: %04X", gb->memory.hdmaSource);
return;
return value | 0x80;
}
gb->memory.hdmaDest &= 0x1FF0;
gb->memory.hdmaDest |= 0x8000;
@ -471,7 +471,10 @@ void GBMemoryWriteHDMA5(struct GB* gb, uint8_t value) {
}
gb->cpuBlocked = true;
mTimingSchedule(&gb->timing, &gb->memory.hdmaEvent, 0);
} else if (gb->memory.isHdma && !GBRegisterLCDCIsEnable(gb->memory.io[REG_LCDC])) {
return 0x80 | ((value + 1) & 0x7F);
}
return value & 0x7F;
}
void _GBMemoryDMAService(struct mTiming* timing, void* context, uint32_t cyclesLate) {