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make ROM command handling accurate, remove gross DMA hack.

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This commit is contained in:
StapleButter
2017-04-11 20:21:31 +02:00
parent 0b981f2a4d
commit 96a3848d84
4 changed files with 24 additions and 56 deletions
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12
src/DMA.cpp
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@ -186,18 +186,6 @@ void DMA::Start()
//printf("ARM%d DMA%d %08X %02X %08X->%08X %d bytes %dbit\n", CPU?7:9, Num, Cnt, StartMode, CurSrcAddr, CurDstAddr, RemCount*((Cnt&0x04000000)?4:2), (Cnt&0x04000000)?32:16);
// special path for cart DMA. this is a gross hack.
// emulating it properly requires emulating cart transfer delays, so uh... TODO
if (CurSrcAddr==0x04100010 && RemCount==1 && (Cnt & 0x07E00000)==0x07000000 &&
(StartMode==0x05 || StartMode==0x12))
{
NDSCart::DMA(CurDstAddr);
Cnt &= ~0x80000000;
if (Cnt & 0x40000000)
NDS::SetIRQ(CPU, NDS::IRQ_DMA0 + Num);
return;
}
// special path for the display FIFO. another gross hack.
// the display FIFO seems to be more like a circular buffer that holds 16 pixels
// from which the display controller reads. DMA is triggered every 8 pixels to fill it