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repair the rarely used main memory display dma that was broken a year ago

This commit is contained in:
zeromus 2010-10-02 02:04:54 +00:00
parent 414d661205
commit 5ac1ce70b5
1 changed files with 7 additions and 1 deletions
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8
desmume/src/MMU.cpp
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@ -1832,7 +1832,13 @@ void DmaController::doCopy()
//generate a copy count depending on various copy mode's behavior //generate a copy count depending on various copy mode's behavior
u32 todo = wordcount; u32 todo = wordcount;
if(todo == 0) todo = 0x200000; //according to gbatek.. //TODO - this should not work this way for arm7 according to gbatek if(todo == 0) todo = 0x200000; //according to gbatek.. //TODO - this should not work this way for arm7 according to gbatek
if(startmode == EDMAMode_MemDisplay) todo = 128; //this is a hack. maybe an alright one though. it should be 4 words at a time. this is a whole scanline if(startmode == EDMAMode_MemDisplay)
{
todo = 128; //this is a hack. maybe an alright one though. it should be 4 words at a time. this is a whole scanline
//apparently this dma turns off after it finishes a frame
if(nds.VCount==191) enable = 0;
}
if(startmode == EDMAMode_Card) todo *= 0x80; if(startmode == EDMAMode_Card) todo *= 0x80;
if(startmode == EDMAMode_GXFifo) todo = std::min(todo,(u32)112); if(startmode == EDMAMode_GXFifo) todo = std::min(todo,(u32)112);