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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
#include "emu.h"
#include "ym2151.h"
DEFINE_DEVICE_TYPE(YM2151, ym2151_device, "ym2151", "YM2151 OPM")
DEFINE_DEVICE_TYPE(YM2164, ym2164_device, "ym2164", "YM2164 OPP")
DEFINE_DEVICE_TYPE(YM2414, ym2414_device, "ym2414", "YM2414 OPZ")
//*********************************************************
// YM2151 DEVICE
//*********************************************************
//-------------------------------------------------
// ym2151_device - constructor
//-------------------------------------------------
ym2151_device::ym2151_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, device_type type) :
device_t(mconfig, type, tag, owner, clock),
device_sound_interface(mconfig, *this),
m_fm(*this),
m_stream(nullptr),
m_port_w(*this),
m_busy_duration(m_fm.compute_busy_duration()),
m_address(0),
m_reset_state(1)
{
}
//-------------------------------------------------
// read - handle a read from the device
//-------------------------------------------------
u8 ym2151_device::read(offs_t offset)
{
u8 result = 0xff;
switch (offset & 1)
{
case 0: // data port (unused)
logerror("Unexpected read from YM2151 offset %d\n", offset & 3);
break;
case 1: // status port, YM2203 compatible
result = m_fm.status();
break;
}
return result;
}
//-------------------------------------------------
// write - handle a write to the register
// interface
//-------------------------------------------------
void ym2151_device::write(offs_t offset, u8 value)
{
// ignore writes when the reset is active (low)
if (m_reset_state == 0)
return;
switch (offset & 1)
{
case 0: // address port
m_address = value;
break;
case 1: // data port
// force an update
m_stream->update();
// write to FM
m_fm.write(m_address, value);
// special cases
if (m_address == 0x01 && BIT(value, 1))
{
// writes to the test register can reset the LFO
m_fm.reset_lfo();
}
else if (m_address == 0x1b)
{
// writes to register 0x1B send the upper 2 bits to the output lines
m_port_w(0, value >> 6, 0xff);
}
// mark busy for a bit
m_fm.set_busy_end(machine().time() + m_busy_duration);
break;
}
}
//-------------------------------------------------
// reset_w - write to the (active low) reset line
//-------------------------------------------------
WRITE_LINE_MEMBER(ym2151_device::reset_w)
{
// reset the device upon going low
if (state == 0 && m_reset_state != 0)
reset();
m_reset_state = state;
}
//-------------------------------------------------
// device_start - start of emulation
//-------------------------------------------------
void ym2151_device::device_start()
{
// create our stream
m_stream = stream_alloc(0, fm_engine::OUTPUTS, m_fm.sample_rate(clock()));
// resolve the write callback
m_port_w.resolve_safe();
// call this for the variants that need to adjust the rate
device_clock_changed();
// initialize the FM engine
m_fm.init();
}
//-------------------------------------------------
// device_register_save - register for save state
//-------------------------------------------------
void ym2151_device::device_register_save(save_registrar &save)
{
// save our data
save.reg(NAME(m_address))
.reg(NAME(m_reset_state));
// save the engines
m_fm.register_save(save);
}
//-------------------------------------------------
// device_reset - start of emulation
//-------------------------------------------------
void ym2151_device::device_reset()
{
// reset the engines
m_fm.reset();
}
//-------------------------------------------------
// device_clock_changed - update if clock changes
//-------------------------------------------------
void ym2151_device::device_clock_changed()
{
m_stream->set_sample_rate(m_fm.sample_rate(clock()));
m_busy_duration = m_fm.compute_busy_duration();
}
//-------------------------------------------------
// sound_stream_update - update the sound stream
//-------------------------------------------------
void ym2151_device::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs)
{
// iterate over all target samples
for (int sampindex = 0; sampindex < outputs[0].samples(); sampindex++)
{
// clock the system
m_fm.clock(fm_engine::ALL_CHANNELS);
// update the FM content; YM2151 is full 14-bit with no intermediate clipping
s32 sums[fm_engine::OUTPUTS] = { 0 };
m_fm.output(sums, 0, 32767, fm_engine::ALL_CHANNELS);
// convert to 10.3 floating point value for the DAC and back
// YM2151 is stereo
for (int index = 0; index < fm_engine::OUTPUTS; index++)
outputs[index].put_int(sampindex, ymfm_roundtrip_fp(sums[index]), 32768);
}
}
//*********************************************************
// YM2164 DEVICE
//*********************************************************
//-------------------------------------------------
// ym2164_device - constructor
//-------------------------------------------------
ym2164_device::ym2164_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
ym2151_device(mconfig, tag, owner, clock, YM2164)
{
}
//-------------------------------------------------
// write - handle a write to the register
// interface
//-------------------------------------------------
void ym2164_device::write(offs_t offset, u8 value)
{
// ignore writes when the reset is active (low)
if (m_reset_state == 0)
return;
switch (offset & 1)
{
case 0: // address port
m_address = value;
break;
case 1: // data port
// force an update
m_stream->update();
// write to FM
m_fm.write(m_address, value);
// writes to register 0x1B send the upper 2 bits to the output lines
if (m_address == 0x1b)
m_port_w(0, value >> 6, 0xff);
// mark busy for a bit
m_fm.set_busy_end(machine().time() + m_busy_duration);
break;
}
}
//*********************************************************
// YM2151 DEVICE
//*********************************************************
//-------------------------------------------------
// ym2414_device - constructor
//-------------------------------------------------
ym2414_device::ym2414_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
ym2151_device(mconfig, tag, owner, clock, YM2414)
{
}
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