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add Reset function to sn76496

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This commit is contained in:
dinkc64 2015-03-02 07:08:50 +00:00
parent bc42ab57a9
commit 99a1e0f054
2 changed files with 41 additions and 22 deletions
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62
src/burn/snd/sn76496.cpp
View File

@ -432,32 +432,50 @@ static void SN76496SetGain(struct SN76496 *R,INT32 Gain)
R->VolTable[15] = 0;
}
void SN76496Reset()
{
#if defined FBA_DEBUG
if (!DebugSnd_SN76496Initted) bprintf(PRINT_ERROR, _T("SN76496Reset called without init\n"));
#endif
struct SN76496 *R = Chip0;
INT32 i, Num;
for (Num = 0; Num < NumChips; Num++) {
if (Num == 0) R = Chip0;
if (Num == 1) R = Chip1;
if (Num == 2) R = Chip2;
if (Num == 3) R = Chip3;
if (Num == 4) R = Chip4;
for (i = 0; i < 4; i++) R->Volume[i] = 0;
R->LastRegister = 0;
for (i = 0; i < 8; i += 2) {
R->Register[i + 0] = 0x00;
R->Register[i + 1] = 0x0f;
}
for (i = 0; i < 4; i++) {
R->Output[i] = 0;
R->Period[i] = R->Count[i] = R->UpdateStep;
}
R->FeedbackMask = 0x4000;
R->WhitenoiseTaps = 0x03;
R->WhitenoiseInvert = 1;
R->StereoMask = 0xFF;
R->RNG = R->FeedbackMask;
R->Output[3] = R->RNG & 1;
}
}
static void SN76496Init(struct SN76496 *R, INT32 Clock)
{
INT32 i;
R->UpdateStep = (UINT32)(((double)STEP * nBurnSoundRate * 16) / Clock);
for (i = 0; i < 4; i++) R->Volume[i] = 0;
R->LastRegister = 0;
for (i = 0; i < 8; i += 2) {
R->Register[i + 0] = 0x00;
R->Register[i + 1] = 0x0f;
}
for (i = 0; i < 4; i++) {
R->Output[i] = 0;
R->Period[i] = R->Count[i] = R->UpdateStep;
}
R->FeedbackMask = 0x4000;
R->WhitenoiseTaps = 0x03;
R->WhitenoiseInvert = 1;
R->StereoMask = 0xFF;
R->RNG = R->FeedbackMask;
R->Output[3] = R->RNG & 1;
SN76496Reset();
}
static void GenericStart(INT32 Num, INT32 Clock, INT32 FeedbackMask, INT32 NoiseTaps, INT32 NoiseInvert, INT32 SignalAdd)

1
src/burn/snd/sn76496.h
View File

@ -7,5 +7,6 @@ void SN76489AInit(INT32 Num, INT32 Clock, INT32 SignalAdd);
void SN76494Init(INT32 Num, INT32 Clock, INT32 SignalAdd);
void SN76496Init(INT32 Num, INT32 Clock, INT32 SignalAdd);
void SN76496SetRoute(INT32 Num, double nVolume, INT32 nRouteDir);
void SN76496Reset();
void SN76496Exit();
INT32 SN76496Scan(INT32 nAction,INT32 *pnMin);