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DS Slot-1: Emulate KEY delay, improve timing

This commit is contained in:
Vicki Pfau 2017-04-25 00:37:06 -07:00
parent 7879736a44
commit 04541e3b1d
3 changed files with 38 additions and 22 deletions
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1
CHANGES
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@ -34,6 +34,7 @@ Misc:
- DS: Attempt to detect if a game is homebrew
- Qt: Add .srl as an extension for DS ROMs
- FFmpeg: Allow framerate to be adjusted
- DS Slot-1: Emulate KEY delay
0.6.0: (Future)
Features:

2
include/mgba/internal/ds/slot1.h
View File

@ -24,6 +24,8 @@ DECL_BIT(DSSlot1AUXSPICNT, DoIRQ, 14);
DECL_BIT(DSSlot1AUXSPICNT, Enable, 15);
DECL_BITFIELD(DSSlot1ROMCNT, uint32_t);
DECL_BITS(DSSlot1ROMCNT, Delay, 0, 12);
DECL_BITS(DSSlot1ROMCNT, Gap, 16, 5);
DECL_BIT(DSSlot1ROMCNT, WordReady, 23);
DECL_BITS(DSSlot1ROMCNT, BlockSize, 24, 3);
DECL_BIT(DSSlot1ROMCNT, TransferRate, 27);

57
src/ds/slot1.c
View File

@ -49,10 +49,11 @@ static void _scheduleTransfer(struct DS* ds, struct mTiming* timing, uint32_t by
} else {
cycles = 5;
}
cycles *= bytes;
if (!ds->ds7.memory.slot1Access) {
cycles <<= 1;
}
cycles *= bytes / 4;
cycles -= cyclesLate;
mTimingDeschedule(timing, &ds->memory.slot1.transferEvent);
mTimingSchedule(timing, &ds->memory.slot1.transferEvent, cycles);
@ -91,23 +92,20 @@ static void _transferEvent(struct mTiming* timing, void* context, uint32_t cycle
ds->memory.slot1.dmaSource = -1;
}
if (ds->memory.slot1.transferRemaining) {
ds->romVf->read(ds->romVf, ds->memory.slot1.readBuffer, 4);
// TODO: Error check
ds->memory.slot1.address += 4;
ds->memory.slot1.transferRemaining -= 4;
romcnt = DSSlot1ROMCNTFillWordReady(romcnt);
ds->romVf->read(ds->romVf, ds->memory.slot1.readBuffer, 4);
// TODO: Error check
ds->memory.slot1.address += 4;
ds->memory.slot1.transferRemaining -= 4;
romcnt = DSSlot1ROMCNTFillWordReady(romcnt);
if (hasDMA) {
dma->when = mTimingCurrentTime(timing);
dma->nextCount = 1;
DSDMAUpdate(dscore);
}
} else {
if (hasDMA) {
dma->when = mTimingCurrentTime(timing);
dma->nextCount = 1;
DSDMAUpdate(dscore);
}
if (!ds->memory.slot1.transferRemaining) {
DSSlot1AUXSPICNT config = ds->memory.io7[DS_REG_AUXSPICNT >> 1];
memset(ds->memory.slot1.readBuffer, 0, 4);
romcnt = DSSlot1ROMCNTClearWordReady(romcnt);
romcnt = DSSlot1ROMCNTClearBlockBusy(romcnt);
if (DSSlot1AUXSPICNTIsDoIRQ(config)) {
DSRaiseIRQ(dscore->cpu, dscore->memory.io, DS_IRQ_SLOT1_TRANS);
}
@ -142,10 +140,13 @@ static void DSSlot1StartTransfer(struct DS* ds) {
ds->romVf->seek(ds->romVf, ds->memory.slot1.address, SEEK_SET);
}
ds->memory.slot1.transferRemaining = ds->memory.slot1.transferSize;
DSSlot1ROMCNT romcnt = ds->memory.io7[DS_REG_ROMCNT_LO >> 1];
unsigned delay = DSSlot1ROMCNTGetDelay(romcnt) + 12;
if (ds->ds7.memory.slot1Access) {
_scheduleTransfer(ds, &ds->ds7.timing, 12, 0);
_scheduleTransfer(ds, &ds->ds7.timing, delay, 0);
} else {
_scheduleTransfer(ds, &ds->ds9.timing, 12, 0);
_scheduleTransfer(ds, &ds->ds9.timing, delay, 0);
}
break;
case 0xB8:
@ -185,7 +186,6 @@ DSSlot1ROMCNT DSSlot1Control(struct DS* ds, DSSlot1ROMCNT control) {
}
if (DSSlot1ROMCNTIsBlockBusy(control)) {
DSSlot1StartTransfer(ds);
// TODO: timing
if (ds->memory.slot1.command[0] != 0xB7) {
control = DSSlot1ROMCNTFillWordReady(control);
}
@ -196,11 +196,24 @@ DSSlot1ROMCNT DSSlot1Control(struct DS* ds, DSSlot1ROMCNT control) {
uint32_t DSSlot1Read(struct DS* ds) {
uint32_t result;
LOAD_32(result, 0, ds->memory.slot1.readBuffer);
if (ds->ds7.memory.slot1Access) {
_scheduleTransfer(ds, &ds->ds7.timing, 4, 0);
DSSlot1ROMCNT romcnt;
// TODO: Big endian
LOAD_32(romcnt, DS_REG_ROMCNT_LO, ds->memory.io7);
romcnt = DSSlot1ROMCNTClearWordReady(romcnt);
if (ds->memory.slot1.transferRemaining) {
if (ds->ds7.memory.slot1Access) {
_scheduleTransfer(ds, &ds->ds7.timing, 4, 0);
} else {
_scheduleTransfer(ds, &ds->ds9.timing, 4, 0);
}
} else {
_scheduleTransfer(ds, &ds->ds9.timing, 4, 0);
romcnt = DSSlot1ROMCNTClearBlockBusy(romcnt);
}
STORE_32(romcnt, DS_REG_ROMCNT_LO, ds->memory.io7);
STORE_32(romcnt, DS_REG_ROMCNT_LO, ds->memory.io9);
return result;
}