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GB Memory: Fix HDMA count starting in mode 0 (fixes #855)

This commit is contained in:
Vicki Pfau 2017-08-12 14:12:49 -07:00
parent f252436d0a
commit 546688f9fb
3 changed files with 7 additions and 2 deletions
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1
CHANGES
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@ -31,6 +31,7 @@ Bugfixes:
- Qt: Fix sprite export pausing game indefinitely (fixes mgba.io/i/841)
- ARM: Fix MSR when T bit is set
- GB Video: Fix potential hang when ending mode 0
- GB Memory: Fix HDMA count starting in mode 0 (fixes mgba.io/i/855)
Misc:
- GBA Timer: Use global cycles for timers
- GBA: Extend oddly-sized ROMs to full address space (fixes mgba.io/i/722)

5
src/gb/memory.c
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@ -469,10 +469,13 @@ void GBMemoryWriteHDMA5(struct GB* gb, uint8_t value) {
bool wasHdma = gb->memory.isHdma;
gb->memory.isHdma = value & 0x80;
if ((!wasHdma && !gb->memory.isHdma) || gb->video.mode == 0) {
if (gb->memory.isHdma) {
gb->memory.hdmaRemaining = 0x10;
} else {
gb->memory.hdmaRemaining = ((value & 0x7F) + 1) * 0x10;
}
gb->cpuBlocked = true;
mTimingSchedule(&gb->timing, &gb->memory.hdmaEvent, 0);
gb->cpu->nextEvent = gb->cpu->cycles;
}
}

1
src/gb/video.c
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@ -304,6 +304,7 @@ void _endMode3(struct mTiming* timing, void* context, uint32_t cyclesLate) {
GBVideoProcessDots(video);
if (video->ly < GB_VIDEO_VERTICAL_PIXELS && video->p->memory.isHdma && video->p->memory.io[REG_HDMA5] != 0xFF) {
video->p->memory.hdmaRemaining = 0x10;
video->p->cpuBlocked = true;
mTimingDeschedule(timing, &video->p->memory.hdmaEvent);
mTimingSchedule(timing, &video->p->memory.hdmaEvent, 0);
}