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GB Memory: Bypass GBStore8 for DMA

This commit is contained in:
Jeffrey Pfau 2016-01-27 23:25:36 -08:00
parent 1589b26ade
commit 5d8f676bb0
1 changed files with 4 additions and 2 deletions
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6
src/gb/memory.c
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@ -260,13 +260,15 @@ void GBMemoryDMA(struct GB* gb, uint16_t base) {
gb->cpu->nextEvent = gb->memory.dmaNext; gb->cpu->nextEvent = gb->memory.dmaNext;
} }
gb->memory.dmaSource = base; gb->memory.dmaSource = base;
gb->memory.dmaDest = GB_BASE_OAM; gb->memory.dmaDest = 0;
gb->memory.dmaRemaining = 0xA0; gb->memory.dmaRemaining = 0xA0;
} }
void _GBMemoryDMAService(struct GB* gb) { void _GBMemoryDMAService(struct GB* gb) {
uint8_t b = GBLoad8(gb->cpu, gb->memory.dmaSource); uint8_t b = GBLoad8(gb->cpu, gb->memory.dmaSource);
GBStore8(gb->cpu, gb->memory.dmaDest, b); // TODO: Can DMA write OAM during modes 2-3?
gb->video.oam.raw[gb->memory.dmaDest] = b;
gb->video.renderer->writeOAM(gb->video.renderer, gb->memory.dmaDest);
++gb->memory.dmaSource; ++gb->memory.dmaSource;
++gb->memory.dmaDest; ++gb->memory.dmaDest;
--gb->memory.dmaRemaining; --gb->memory.dmaRemaining;