/*************************************************************************** 2151intf.c Support interface YM2151(OPM) ***************************************************************************/ #include "emu.h" #include "fm.h" #include "2151intf.h" #include "ym2151.h" const device_type YM2151 = &device_creator; //------------------------------------------------- // ym2151_device - constructor //------------------------------------------------- ym2151_device::ym2151_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, YM2151, "YM2151", tag, owner, clock), device_sound_interface(mconfig, *this), m_irqhandler(*this), m_portwritehandler(*this) { } //------------------------------------------------- // read - read from the device //------------------------------------------------- READ8_MEMBER( ym2151_device::read ) { if (offset & 1) { m_stream->update(); return ym2151_read_status(m_chip); } else return 0xff; /* confirmed on a real YM2151 */ } //------------------------------------------------- // write - write from the device //------------------------------------------------- WRITE8_MEMBER( ym2151_device::write ) { if (offset & 1) { m_stream->update(); ym2151_write_reg(m_chip, m_lastreg, data); } else m_lastreg = data; } READ8_MEMBER( ym2151_device::status_r ) { return read(space, 1); } WRITE8_MEMBER( ym2151_device::register_w ) { write(space, 0, data); } WRITE8_MEMBER( ym2151_device::data_w ) { write(space, 1, data); } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void ym2151_device::device_start() { m_irqhandler.resolve_safe(); m_portwritehandler.resolve_safe(); // stream setup int rate = clock() / 64; m_stream = stream_alloc(0, 2, rate); m_chip = ym2151_init(this, clock(), rate); assert_always(m_chip != NULL, "Error creating YM2151 chip"); ym2151_set_irq_handler(m_chip, irq_frontend); ym2151_set_port_write_handler(m_chip, port_write_frontend); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void ym2151_device::device_reset() { ym2151_reset_chip(m_chip); } //------------------------------------------------- // device_stop - device-specific stop //------------------------------------------------- void ym2151_device::device_stop() { ym2151_shutdown(m_chip); } //------------------------------------------------- // sound_stream_update - handle a stream update //------------------------------------------------- void ym2151_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) { ym2151_update_one(m_chip, outputs, samples); } void ym2151_device::irq_frontend(device_t *device, int irq) { downcast(device)->m_irqhandler(irq); } void ym2151_device::port_write_frontend(device_t *device, offs_t offset, UINT8 data) { downcast(device)->m_portwritehandler(offset, data); }