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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
#include "emu.h"
#include "ym2610.h"
DEFINE_DEVICE_TYPE(YM2610, ym2610_device, "ym2610", "YM2610 OPNB")
DEFINE_DEVICE_TYPE(YM2610B, ym2610b_device, "ym2610b", "YM2610 OPNB2")
//*********************************************************
// YM2610/YM2610B DEVICE
//*********************************************************
//-------------------------------------------------
// ym2610_device - constructor
//-------------------------------------------------
ym2610_device::ym2610_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, device_type type, u8 opn_mask) :
ay8910_device(mconfig, type, tag, owner, clock, PSG_TYPE_YM, 1, 0),
device_memory_interface(mconfig, *this),
m_adpcm_a_config("adpcm-a", ENDIANNESS_LITTLE, 8, 24, 0),
m_adpcm_b_config("adpcm-b", ENDIANNESS_LITTLE, 8, 24, 0),
m_adpcm_a_region(*this, "adpcma"),
m_adpcm_b_region(*this, "adpcmb"),
m_opn(*this),
m_adpcm_a(*this, read8sm_delegate(*this, FUNC(ym2610_device::adpcm_a_read)), 8),
m_adpcm_b(*this, read8sm_delegate(*this, FUNC(ym2610_device::adpcm_b_read)), write8sm_delegate(*this), 8),
m_stream(nullptr),
m_busy_duration(m_opn.compute_busy_duration()),
m_address(0),
m_opn_mask(opn_mask),
m_eos_status(0x00),
m_flag_mask(0xbf)
{
}
//-------------------------------------------------
// ym2610b_device - constructor
//-------------------------------------------------
ym2610b_device::ym2610b_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
ym2610_device(mconfig, tag, owner, clock, YM2610B, 0x3f)
{
}
//-------------------------------------------------
// read - handle a read from the device
//-------------------------------------------------
u8 ym2610_device::read(offs_t offset)
{
u8 result = 0;
switch (offset & 3)
{
case 0: // status port, YM2203 compatible
result = m_opn.status() & (ymopna_engine::STATUS_TIMERA | ymopna_engine::STATUS_TIMERB | ymopna_engine::STATUS_BUSY);
break;
case 1: // data port (only SSG)
if (m_address < 0x10)
result = ay8910_read_ym();
else if (m_address == 0xff)
result = 1; // ID code
break;
case 2: // status port, extended
result = m_eos_status & m_flag_mask;
break;
case 3: // ADPCM-B data
break;
}
return result;
}
//-------------------------------------------------
// write - handle a write to the register
// interface
//-------------------------------------------------
void ym2610_device::write(offs_t offset, u8 value)
{
switch (offset & 3)
{
case 0: // address port
m_address = value;
// write register to SSG emulator
if (m_address < 0x10)
ay8910_write_ym(0, m_address);
break;
case 1: // data port
// ignore if paired with upper address
if (BIT(m_address, 8))
break;
if (m_address < 0x10)
{
// write to SSG
ay8910_write_ym(1, value);
}
else if (m_address < 0x1c)
{
// write to ADPCM-B
m_stream->update();
u8 address = m_address & 0x0f;
// YM2610 effectively forces external mode on, and disables recording
if (address == 0)
value = (value | 0x20) & ~0x40;
m_adpcm_b.write(address, value);
}
else if (m_address == 0x1c)
{
// EOS flag reset
m_stream->update();
m_flag_mask = ~value;
m_eos_status &= ~value;
}
else
{
// write to OPN
m_stream->update();
m_opn.write(m_address, value);
}
// mark busy for a bit
m_opn.set_busy_end(machine().time() + m_busy_duration);
break;
case 2: // upper address port
m_address = 0x100 | value;
break;
case 3: // upper data port
// ignore if paired with lower address
if (!BIT(m_address, 8))
break;
if (m_address < 0x130)
{
// write to ADPCM-A
m_stream->update();
m_adpcm_a.write(m_address & 0x3f, value);
}
else
{
// write to OPN
m_stream->update();
m_opn.write(m_address, value);
}
// mark busy for a bit
m_opn.set_busy_end(machine().time() + m_busy_duration);
break;
}
}
//-------------------------------------------------
// memory_space_config - return a description of
// any address spaces owned by this device
//-------------------------------------------------
device_memory_interface::space_config_vector ym2610_device::memory_space_config() const
{
return space_config_vector{
std::make_pair(0, &m_adpcm_a_config),
std::make_pair(1, &m_adpcm_b_config)
};
}
//-------------------------------------------------
// device_start - start of emulation
//-------------------------------------------------
void ym2610_device::device_start()
{
// call our parent
ay8910_device::device_start();
// create our stream
m_stream = stream_alloc(0, 2, clock() / (4 * 6 * 6));
// save our data
save_item(YMFM_NAME(m_address));
save_item(YMFM_NAME(m_eos_status));
save_item(YMFM_NAME(m_flag_mask));
// save the engines
m_opn.save(*this);
m_adpcm_a.save(*this);
m_adpcm_b.save(*this);
// automatically map memory regions if not configured externally
if (!has_configured_map(0) && !has_configured_map(1))
{
if (m_adpcm_a_region)
space(0).install_rom(0, m_adpcm_a_region->bytes() - 1, m_adpcm_a_region->base());
if (m_adpcm_b_region)
space(1).install_rom(0, m_adpcm_b_region->bytes() - 1, m_adpcm_b_region->base());
else if (m_adpcm_a_region)
space(1).install_rom(0, m_adpcm_a_region->bytes() - 1, m_adpcm_a_region->base());
}
}
//-------------------------------------------------
// device_reset - start of emulation
//-------------------------------------------------
void ym2610_device::device_reset()
{
// call our parent
ay8910_device::device_reset();
// reset the engines
m_opn.reset();
m_adpcm_a.reset();
m_adpcm_b.reset();
// initialize our special interrupt states
m_eos_status = 0x00;
m_flag_mask = 0xbf;
}
//-------------------------------------------------
// device_clock_changed - update if clock changes
//-------------------------------------------------
void ym2610_device::device_clock_changed()
{
m_stream->set_sample_rate(clock() / (4 * 6 * 6));
ay_set_clock(clock() / 4);
// recompute the busy duration
m_busy_duration = m_opn.compute_busy_duration();
}
//-------------------------------------------------
// sound_stream_update - update the sound stream
//-------------------------------------------------
void ym2610_device::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs)
{
// if this is not our stream, pass it on
if (&stream != m_stream)
{
ay8910_device::sound_stream_update(stream, inputs, outputs);
return;
}
// iterate over all target samples
for (int sampindex = 0; sampindex < outputs[0].samples(); sampindex++)
{
// clock the OPN
u32 env_counter = m_opn.clock(m_opn_mask);
// clock the ADPCM-A engine on every envelope cycle
if (BIT(env_counter, 0, 2) == 0)
m_eos_status |= m_adpcm_a.clock(0x3f);
// clock the ADPCM-B engine every cycle
m_adpcm_b.clock(0x01);
if ((m_adpcm_b.status(0) & ymadpcm_b_channel::STATUS_EOS) != 0)
m_eos_status |= 0x80;
// update the OPN content; OPNB is 13-bit with no intermediate clipping
s32 lsum = 0, rsum = 0;
m_opn.output(lsum, rsum, 1, 32767, m_opn_mask);
// mix in the ADPCM
m_adpcm_a.output(lsum, rsum, 0x3f);
m_adpcm_b.output(lsum, rsum, 2, 0x01);
// YM2608 is stereo
outputs[0].put_int_clamp(sampindex, lsum, 32768);
outputs[1].put_int_clamp(sampindex, rsum, 32768);
}
}
//-------------------------------------------------
// adpcm_a_read - callback to read data for the
// ADPCM-A engine; in this case, from address
// space 0
//-------------------------------------------------
u8 ym2610_device::adpcm_a_read(offs_t offset)
{
return space(0).read_byte(offset);
}
//-------------------------------------------------
// adpcm_b_read - callback to read data for the
// ADPCM-B engine; in this case, from address
// space 1
//-------------------------------------------------
u8 ym2610_device::adpcm_b_read(offs_t offset)
{
return space(1).read_byte(offset);
}
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