// license:BSD-3-Clause // copyright-holders:Ernesto Corvi /*************************************************************************** 2612intf.c The YM2612 emulator supports up to 2 chips. Each chip has the following connections: - Status Read / Control Write A - Port Read / Data Write A - Control Write B - Data Write B ***************************************************************************/ #include "emu.h" #include "2612intf.h" #include "fm.h" /*------------------------- YM2612 -------------------------------*/ /* IRQ Handler */ void ym2612_device::irq_handler(int irq) { if (!m_irq_handler.isnull()) m_irq_handler(irq); } /* Timer overflow callback from timer.c */ void ym2612_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) { switch(id) { case 0: ym2612_timer_over(m_chip,0); break; case 1: ym2612_timer_over(m_chip,1); break; } } void ym2612_device::timer_handler(int c,int count,int clock) { if( count == 0 ) { /* Reset FM Timer */ m_timer[c]->enable(false); } else { /* Start FM Timer */ attotime period = attotime::from_hz(clock) * count; if (!m_timer[c]->enable(true)) m_timer[c]->adjust(period); } } //------------------------------------------------- // sound_stream_update - handle a stream update //------------------------------------------------- void ym2612_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) { ym2612_update_one(m_chip, outputs, samples); } void ym2612_device::device_post_load() { ym2612_postload(m_chip); } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void ym2612_device::device_start() { int rate = clock()/72; m_irq_handler.resolve(); /* FM init */ /* Timer Handler set */ m_timer[0] = timer_alloc(0); m_timer[1] = timer_alloc(1); /* stream system initialize */ m_stream = machine().sound().stream_alloc(*this,0,2,rate); /**** initialize YM2612 ****/ m_chip = ym2612_init(this,clock(),rate,&ym2612_device::static_timer_handler,&ym2612_device::static_irq_handler); assert_always(m_chip != nullptr, "Error creating YM2612 chip"); } void ym2612_device::device_clock_changed() { calculate_rates(); ym2612_clock_changed(m_chip, clock(), clock() / 72); } void ym2612_device::calculate_rates() { int rate = clock() / 72; if (m_stream != nullptr) m_stream->set_sample_rate(rate); else m_stream = machine().sound().stream_alloc(*this,0,2,rate); } //------------------------------------------------- // device_stop - device-specific stop //------------------------------------------------- void ym2612_device::device_stop() { ym2612_shutdown(m_chip); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void ym2612_device::device_reset() { ym2612_reset_chip(m_chip); } READ8_MEMBER( ym2612_device::read ) { return ym2612_read(m_chip, offset & 3); } WRITE8_MEMBER( ym2612_device::write ) { ym2612_write(m_chip, offset & 3, data); } DEFINE_DEVICE_TYPE(YM2612, ym2612_device, "ym2612", "YM2612 OPN2") ym2612_device::ym2612_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : ym2612_device(mconfig, YM2612, tag, owner, clock) { } ym2612_device::ym2612_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, type, tag, owner, clock) , device_sound_interface(mconfig, *this) , m_stream(nullptr) , m_timer{ nullptr, nullptr } , m_chip(nullptr) , m_irq_handler(*this) { } DEFINE_DEVICE_TYPE(YM3438, ym3438_device, "ym3438", "YM3438 OPN2C") ym3438_device::ym3438_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : ym2612_device(mconfig, YM3438, tag, owner, clock) { }