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mgba
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Sample FIFOs with sound DMA timer

This commit is contained in:
Jeffrey Pfau 2013-10-02 00:46:51 -07:00
parent 71ec6162f1
commit a834f8b1f6
3 changed files with 31 additions and 13 deletions
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20
src/gba/gba-audio.h
View File

@ -138,17 +138,17 @@ struct GBAAudio {
union {
struct {
unsigned volume : 2;
unsigned volumeDmaA : 1;
unsigned volumeDmaB : 1;
unsigned volumeChA : 1;
unsigned volumeChB : 1;
unsigned : 4;
unsigned dmaARight : 1;
unsigned dmaALeft : 1;
unsigned dmaATimer : 1;
unsigned dmaAReset : 1;
unsigned dmaBRight : 1;
unsigned dmaBLeft : 1;
unsigned dmaBTimer : 1;
unsigned dmaBReset : 1;
unsigned chARight : 1;
unsigned chALeft : 1;
unsigned chATimer : 1;
unsigned chAReset : 1;
unsigned chBRight : 1;
unsigned chBLeft : 1;
unsigned chBTimer : 1;
unsigned chBReset : 1;
};
uint16_t soundcntHi;
};

4
src/gba/gba-io.c
View File

@ -209,10 +209,8 @@ void GBAIOWrite32(struct GBA* gba, uint32_t address, uint32_t value) {
GBAAudioWriteWaveRAM(&gba->audio, 3, value);
break;
case REG_FIFO_A_LO:
GBAAudioWriteFIFO(&gba->audio, 0, value);
break;
case REG_FIFO_B_LO:
GBAAudioWriteFIFO(&gba->audio, 1, value);
GBAAudioWriteFIFO(&gba->audio, address, value);
break;
case REG_DMA0SAD_LO:
GBAMemoryWriteDMASAD(&gba->memory, 0, value);

20
src/gba/gba.c
View File

@ -136,6 +136,16 @@ static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
GBARaiseIRQ(gba, IRQ_TIMER0);
}
if (gba->audio.enable) {
if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
GBAAudioSampleFIFO(&gba->audio, 0);
}
if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
GBAAudioSampleFIFO(&gba->audio, 1);
}
}
nextTimer = &gba->timers[1];
if (nextTimer->countUp) {
++gba->memory.io[REG_TM1CNT_LO >> 1];
@ -161,6 +171,16 @@ static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
GBARaiseIRQ(gba, IRQ_TIMER1);
}
if (gba->audio.enable) {
if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
GBAAudioSampleFIFO(&gba->audio, 0);
}
if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
GBAAudioSampleFIFO(&gba->audio, 1);
}
}
if (timer->countUp) {
timer->nextEvent = INT_MAX;
}