diff options
Diffstat (limited to 'src/devices/sound/2151intf.cpp')
-rw-r--r-- | src/devices/sound/2151intf.cpp | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/devices/sound/2151intf.cpp b/src/devices/sound/2151intf.cpp new file mode 100644 index 00000000000..e4739c758ee --- /dev/null +++ b/src/devices/sound/2151intf.cpp @@ -0,0 +1,131 @@ +// license:BSD-3-Clause +// copyright-holders:Ernesto Corvi +/*************************************************************************** + + 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>; + + +//------------------------------------------------- +// 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, "ym2151", __FILE__), + 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<ym2151_device *>(device)->m_irqhandler(irq); +} + +void ym2151_device::port_write_frontend(device_t *device, offs_t offset, UINT8 data) +{ + downcast<ym2151_device *>(device)->m_portwritehandler(offset, data); +} |