// license:BSD-3-Clause // copyright-holders:Ernesto Corvi #include "2203intf.h" #include "fm.h" static void psg_set_clock(void *param, int clock) { ym2203_device *ym2203 = (ym2203_device *) param; ym2203->ay_set_clock(clock); } static void psg_write(void *param, int address, int data) { ym2203_device *ym2203 = (ym2203_device *) param; ym2203->ay8910_write_ym(address, data); } static int psg_read(void *param) { ym2203_device *ym2203 = (ym2203_device *) param; return ym2203->ay8910_read_ym(); } static void psg_reset(void *param) { ym2203_device *ym2203 = (ym2203_device *) param; ym2203->ay8910_reset_ym(); } static const ssg_callbacks psgintf = { psg_set_clock, psg_write, psg_read, psg_reset }; /* IRQ Handler */ static void IRQHandler(void *param,int irq) { ym2203_device *ym2203 = (ym2203_device *) param; ym2203->_IRQHandler(irq); } void ym2203_device::_IRQHandler(int irq) { if (!m_irq_handler.isnull()) m_irq_handler(irq); } /* Timer overflow callback from timer.c */ void ym2203_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) { switch(id) { case 0: ym2203_timer_over(m_chip,0); break; case 1: ym2203_timer_over(m_chip,1); break; } } static void timer_handler(void *param,int c,int count,int clock) { ym2203_device *ym2203 = (ym2203_device *) param; ym2203->_timer_handler(c, count, clock); } void ym2203_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); } } /* update request from fm.c */ void ym2203_update_request(void *param) { ym2203_device *ym2203 = (ym2203_device *) param; ym2203->_ym2203_update_request(); } void ym2203_device::_ym2203_update_request() { m_stream->update(); } //------------------------------------------------- // sound_stream_update - handle a stream update //------------------------------------------------- void ym2203_device::stream_generate(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) { ym2203_update_one(m_chip, outputs[0], samples); } void ym2203_device::device_post_load() { ym2203_postload(m_chip); } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void ym2203_device::device_start() { ay8910_device::device_start(); int rate = clock()/72; /* ??? */ m_irq_handler.resolve(); /* 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,0,1,rate, stream_update_delegate(FUNC(ym2203_device::stream_generate),this)); /* Initialize FM emurator */ m_chip = ym2203_init(this,this,clock(),rate,timer_handler,IRQHandler,&psgintf); assert_always(m_chip != NULL, "Error creating YM2203 chip"); } //------------------------------------------------- // device_stop - device-specific stop //------------------------------------------------- void ym2203_device::device_stop() { ym2203_shutdown(m_chip); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void ym2203_device::device_reset() { ym2203_reset_chip(m_chip); } READ8_MEMBER( ym2203_device::read ) { return ym2203_read(m_chip, offset & 1); } WRITE8_MEMBER( ym2203_device::write ) { ym2203_write(m_chip, offset & 1, data); } READ8_MEMBER( ym2203_device::status_port_r ) { return read(space, 0); } READ8_MEMBER( ym2203_device::read_port_r ) { return read(space, 1); } WRITE8_MEMBER( ym2203_device::control_port_w ) { write(space, 0, data); } WRITE8_MEMBER( ym2203_device::write_port_w ) { write(space, 1, data); } const device_type YM2203 = &device_creator; ym2203_device::ym2203_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : ay8910_device(mconfig, YM2203, "YM2203", tag, owner, clock, PSG_TYPE_YM, 3, 2, "ym2203", __FILE__), m_irq_handler(*this) { }