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GBC: Fixed GDMA timing (setup should only be done once, not once per block)

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This commit is contained in:
Sour 2020-07-03 11:08:31 -04:00
parent ff1848857c
commit af49013e92
1 changed files with 8 additions and 4 deletions
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12
Core/GbDmaController.cpp
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@ -86,6 +86,10 @@ void GbDmaController::WriteCgb(uint16_t addr, uint8_t value)
_state.CgbHdmaRunning = false;
_state.CgbHdmaDone = true;
} else {
//4 cycles for setup
_memoryManager->Exec();
_memoryManager->Exec();
do {
ProcessDmaBlock();
} while(_state.CgbDmaLength != 0x7F);
@ -109,6 +113,10 @@ void GbDmaController::WriteCgb(uint16_t addr, uint8_t value)
void GbDmaController::ProcessHdma()
{
if(_state.CgbHdmaRunning) {
//4 cycles for setup
_memoryManager->Exec();
_memoryManager->Exec();
ProcessDmaBlock();
}
}
@ -116,10 +124,6 @@ void GbDmaController::ProcessHdma()
void GbDmaController::ProcessDmaBlock()
{
//TODO check invalid dma sources/etc.
//4 cycles for setup
_memoryManager->Exec();
_memoryManager->Exec();
for(int i = 0; i < 16; i++) {
uint16_t dst = 0x8000 | ((_state.CgbDmaDest + i) & 0x1FFF);