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ym2203: Handle interrupt output as instant timer to prevent synchronization glitches

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This commit is contained in:
AJR 2018-02-18 16:37:06 -05:00
parent 1a157c0600
commit ad8165d99c
2 changed files with 19 additions and 7 deletions
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17
src/devices/sound/2203intf.cpp
View File

@ -15,8 +15,7 @@ const ssg_callbacks ym2203_device::psgintf =
/* IRQ Handler */ /* IRQ Handler */
void ym2203_device::irq_handler(int irq) void ym2203_device::irq_handler(int irq)
{ {
if (!m_irq_handler.isnull()) m_timer[2]->adjust(attotime::zero, irq);
m_irq_handler(irq);
} }
/* Timer overflow callback from timer.c */ /* Timer overflow callback from timer.c */
@ -24,13 +23,18 @@ void ym2203_device::device_timer(emu_timer &timer, device_timer_id id, int param
{ {
switch(id) switch(id)
{ {
case 0: case TIMER_A:
ym2203_timer_over(m_chip,0); ym2203_timer_over(m_chip,0);
break; break;
case 1: case TIMER_B:
ym2203_timer_over(m_chip,1); ym2203_timer_over(m_chip,1);
break; break;
case TIMER_IRQ_SYNC:
if (!m_irq_handler.isnull())
m_irq_handler(param);
break;
} }
} }
@ -77,8 +81,9 @@ void ym2203_device::device_start()
m_irq_handler.resolve(); m_irq_handler.resolve();
/* Timer Handler set */ /* Timer Handler set */
m_timer[0] = timer_alloc(0); m_timer[0] = timer_alloc(TIMER_A);
m_timer[1] = timer_alloc(1); m_timer[1] = timer_alloc(TIMER_B);
m_timer[2] = timer_alloc(TIMER_IRQ_SYNC);
/* stream system initialize */ /* stream system initialize */
calculate_rates(); calculate_rates();

9
src/devices/sound/2203intf.h
View File

@ -45,6 +45,13 @@ protected:
void stream_generate(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples); void stream_generate(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
private: private:
enum
{
TIMER_A,
TIMER_B,
TIMER_IRQ_SYNC
};
void irq_handler(int irq); void irq_handler(int irq);
void timer_handler(int c, int count, int clock); void timer_handler(int c, int count, int clock);
void update_request() { m_stream->update(); } void update_request() { m_stream->update(); }
@ -56,7 +63,7 @@ private:
// internal state // internal state
sound_stream * m_stream; sound_stream * m_stream;
emu_timer * m_timer[2]; emu_timer * m_timer[3];
void * m_chip; void * m_chip;
devcb_write_line m_irq_handler; devcb_write_line m_irq_handler;