void JERRYI2SCallback(void)
{
// We don't have to divide the RISC clock rate by this--the reason is a bit
// convoluted. Will put explanation here later...
// What's needed here is to find the ratio of the frequency to the number of
// clock cycles in one second. For example, if the sample rate is 44100, we
// divide the clock rate by this: 26590906 / 44100 = 602 cycles.
// Which means, every 602 cycles that go by we have to generate an interrupt.
jerryI2SCycles = 32 * (2 * (sclk + 1));
//This makes audio faster, but not enough and the pitch is wrong besides
// jerryI2SCycles = 32 * (2 * (sclk - 1));
// If INTERNAL flag is set, then JERRY's SCLK is master
if (smode & SMODE_INTERNAL)
{
// This does the 'IRQ enabled' checking...
DSPSetIRQLine(DSPIRQ_SSI, ASSERT_LINE);
// double usecs = (float)jerryI2SCycles * RISC_CYCLE_IN_USEC;
//this fix is almost enough to fix timings in tripper, but not quite enough...
double usecs = (float)jerryI2SCycles * (vjs.hardwareTypeNTSC ? RISC_CYCLE_IN_USEC : RISC_CYCLE_PAL_IN_USEC);
SetCallbackTime(JERRYI2SCallback, usecs, EVENT_JERRY);
}
else
{
// This is handled in the BUTCH handler, where it should be...
#if 0
// JERRY is slave to external word clock
//Note that 44100 Hz requires samples every 22.675737 usec.
//When JERRY is slave to the word clock, we need to do interrupts either at
//44.1K sample rate or at a 88.2K sample rate (11.332... usec).
/* // This is just a temporary kludge to see if the CD bus mastering works
// I.e., this is totally faked...!
// The whole interrupt system is pretty much borked and is need of an overhaul.
// What we need is a way of handling these interrupts when they happen instead
// of scanline boundaries the way it is now.
jerry_i2s_interrupt_timer -= cycles;
if (jerry_i2s_interrupt_timer <= 0)
{
//This is probably wrong as well (i.e., need to check enable lines)... !!! FIX !!! [DONE]
if (ButchIsReadyToSend())//Not sure this is right spot to check...
{
// return GetWordFromButchSSI(offset, who);
SetSSIWordsXmittedFromButch();
DSPSetIRQLine(DSPIRQ_SSI, ASSERT_LINE);
}
jerry_i2s_interrupt_timer += 602;
}*/
if (ButchIsReadyToSend())//Not sure this is right spot to check...
{
// return GetWordFromButchSSI(offset, who);
SetSSIWordsXmittedFromButch();
DSPSetIRQLine(DSPIRQ_SSI, ASSERT_LINE);
}
SetCallbackTime(JERRYI2SCallback, 22.675737, EVENT_JERRY);
#endif
}
}
void JERRYI2SCallback(void)
{
// We don't have to divide the RISC clock rate by this--the reason is a bit
// convoluted. Will put explanation here later...
// What's needed here is to find the ratio of the frequency to the number of clock cycles
// in one second. For example, if the sample rate is 44100, we divide the clock rate by
// this: 26590906 / 44100 = 602 cycles.
// Which means, every 602 cycles that go by we have to generate an interrupt.
jerryI2SCycles = 32 * (2 * (*sclk + 1));
// If INTERNAL flag is set, then JERRY's SCLK is master
if (*smode & SMODE_INTERNAL)
{
double usecs;
// This does the 'IRQ enabled' checking...
DSPSetIRQLine(DSPIRQ_SSI, ASSERT_LINE);
// double usecs = (float)jerryI2SCycles * RISC_CYCLE_IN_USEC;
//this fix is almost enough to fix timings in tripper, but not quite enough...
usecs = (float)jerryI2SCycles * (vjs.hardwareTypeNTSC ? RISC_CYCLE_IN_USEC : RISC_CYCLE_PAL_IN_USEC);
SetCallbackTime(JERRYI2SCallback, usecs, EVENT_JERRY);
}
else
{
// JERRY is slave to external word clock
//Note that 44100 Hz requires samples every 22.675737 usec.
//When JERRY is slave to the word clock, we need to do interrupts either at 44.1K
//sample rate or at a 88.2K sample rate (11.332... usec).
if (ButchIsReadyToSend())//Not sure this is right spot to check...
{
// return GetWordFromButchSSI(offset, who);
SetSSIWordsXmittedFromButch();
DSPSetIRQLine(DSPIRQ_SSI, ASSERT_LINE);
}
SetCallbackTime(JERRYI2SCallback, 22.675737, EVENT_JERRY);
}
}
void JERRYPIT2Callback(void)
{
if (TOMIRQEnabled(IRQ_DSP))
{
if (jerryInterruptMask & IRQ2_TIMER2) // CPU Timer 2 IRQ
{
jerryPendingInterrupt |= IRQ2_TIMER2;
m68k_set_irq(2); // Generate 68K IPL 2
}
}
DSPSetIRQLine(DSPIRQ_TIMER1, ASSERT_LINE); // This does the 'IRQ enabled' checking...
JERRYResetPIT2();
}
// This is the cause of the regressions in Cybermorph and Missile Command 3D...
// Solution: Probably have to check the DSP enable bit before sending these thru.
void JERRYPIT1Callback(void)
{
if (TOMIRQEnabled(IRQ_DSP))
{
if (jerryInterruptMask & IRQ2_TIMER1) // CPU Timer 1 IRQ
{
// Not sure, but I think we don't generate another IRQ if one's already going...
// But this seems to work... :-/
jerryPendingInterrupt |= IRQ2_TIMER1;
m68k_set_irq(2); // Generate 68K IPL 2
}
}
DSPSetIRQLine(DSPIRQ_TIMER0, ASSERT_LINE); // This does the 'IRQ enabled' checking...
JERRYResetPIT1();
}
void JERRYPIT2Callback(void)
{
#ifndef JERRY_NO_IRQS
if (TOMIRQEnabled(IRQ_DSP))
{
//WriteLog("JERRY: In PIT2 callback, IRQM=$%04X\n", jerryInterruptMask);
if (jerryInterruptMask & IRQ2_TIMER2) // CPU Timer 2 IRQ
{
jerryPendingInterrupt |= IRQ2_TIMER2;
m68k_set_irq(2); // Generate 68K IPL 2
}
}
#endif
DSPSetIRQLine(DSPIRQ_TIMER1, ASSERT_LINE); // This does the 'IRQ enabled' checking...
JERRYResetPIT2();
}
