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GB Memory: Fix HDMAs

This commit is contained in:
Jeffrey Pfau 2016-11-10 20:05:33 -08:00
parent 84844232ec
commit e429d726dc
4 changed files with 12 additions and 2 deletions
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7
src/gb/gb.c
View File

@ -425,6 +425,7 @@ void GBReset(struct LR35902Core* cpu) {
cpu->pc = 0x100;
}
gb->cpuBlocked = false;
gb->eiPending = INT_MAX;
gb->doubleSpeed = 0;
@ -546,7 +547,11 @@ void GBProcessEvents(struct LR35902Core* cpu) {
}
}
cpu->nextEvent = mTimingTick(&gb->timing, cycles);
nextEvent = cycles;
do {
nextEvent = mTimingTick(&gb->timing, nextEvent);
} while (gb->cpuBlocked);
cpu->nextEvent = nextEvent;
if (cpu->halted) {
cpu->cycles = cpu->nextEvent;

1
src/gb/gb.h
View File

@ -78,6 +78,7 @@ struct GB {
struct mCoreCallbacks* coreCallbacks;
struct mAVStream* stream;
bool cpuBlocked;
int32_t eiPending;
unsigned doubleSpeed;
};

5
src/gb/memory.c
View File

@ -381,6 +381,7 @@ void GBMemoryWriteHDMA5(struct GB* gb, uint8_t value) {
gb->memory.isHdma = value & 0x80;
if ((!wasHdma && !gb->memory.isHdma) || gb->video.mode == 0) {
gb->memory.hdmaRemaining = ((value & 0x7F) + 1) * 0x10;
gb->cpuBlocked = true;
mTimingSchedule(&gb->timing, &gb->memory.hdmaEvent, 0);
gb->cpu->nextEvent = gb->cpu->cycles;
}
@ -404,14 +405,17 @@ void _GBMemoryDMAService(struct mTiming* timing, void* context, uint32_t cyclesL
void _GBMemoryHDMAService(struct mTiming* timing, void* context, uint32_t cyclesLate) {
struct GB* gb = context;
gb->cpuBlocked = true;
uint8_t b = gb->cpu->memory.load8(gb->cpu, gb->memory.hdmaSource);
gb->cpu->memory.store8(gb->cpu, gb->memory.hdmaDest, b);
++gb->memory.hdmaSource;
++gb->memory.hdmaDest;
--gb->memory.hdmaRemaining;
if (gb->memory.hdmaRemaining) {
mTimingDeschedule(timing, &gb->memory.hdmaEvent);
mTimingSchedule(timing, &gb->memory.hdmaEvent, 2 - cyclesLate);
} else {
gb->cpuBlocked = false;
gb->memory.io[REG_HDMA1] = gb->memory.hdmaSource >> 8;
gb->memory.io[REG_HDMA2] = gb->memory.hdmaSource;
gb->memory.io[REG_HDMA3] = gb->memory.hdmaDest >> 8;
@ -425,7 +429,6 @@ void _GBMemoryHDMAService(struct mTiming* timing, void* context, uint32_t cycles
gb->memory.io[REG_HDMA5] = 0xFF;
}
}
gb->cpu->cycles += 2;
}
struct OAMBlock {

1
src/gb/video.c
View File

@ -206,6 +206,7 @@ void _endMode3(struct mTiming* timing, void* context, uint32_t cyclesLate) {
}
if (video->ly < GB_VIDEO_VERTICAL_PIXELS && video->p->memory.isHdma && video->p->memory.io[REG_HDMA5] != 0xFF) {
video->p->memory.hdmaRemaining = 0x10;
mTimingDeschedule(timing, &video->p->memory.hdmaEvent);
mTimingSchedule(timing, &video->p->memory.hdmaEvent, 0);
}
video->mode = 0;