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// license:BSD-3-Clause
// copyright-holders:Angelo Salese
/**************************************************************************************************
Creative Labs CT1745 SB16 Mixer chip
References:
- https://the.earth.li/~tfm/oldpage/sb_mixer.html
TODO:
- Pinout reference;
- IRQ select & mask for card host;
- Get a tag reference for CD and (ISA/C-Bus) buzzer speaker volume controls;
- Mic/Line In;
- Stereo control and low-pass filter;
- Input/Output Control (left/right rerouting);
- Gain Control + AGC;
- Bass/Treble;
- Track down really unavailable regs, return 0x80 in index status;
- Track down interactions with LLE DSP (UART?);
**************************************************************************************************/
#include "emu.h"
#include "ct1745.h"
DEFINE_DEVICE_TYPE(CT1745, ct1745_mixer_device, "ct1745", "Creative Labs CT1745 SB16 Mixer")
ct1745_mixer_device::ct1745_mixer_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, CT1745, tag, owner, clock)
, device_memory_interface(mconfig, *this)
, device_mixer_interface(mconfig, *this)
, m_irq_status_cb(*this, 0)
, m_fm(*this, finder_base::DUMMY_TAG)
, m_ldac(*this, finder_base::DUMMY_TAG)
, m_rdac(*this, finder_base::DUMMY_TAG)
{
m_space_config = address_space_config("regs", ENDIANNESS_LITTLE, 8, 8, 0, address_map_constructor(FUNC(ct1745_mixer_device::map), this));
}
device_memory_interface::space_config_vector ct1745_mixer_device::memory_space_config() const
{
return space_config_vector {
std::make_pair(0, &m_space_config)
};
}
void ct1745_mixer_device::device_start()
{
save_item(NAME(m_index));
save_pointer(NAME(m_master_level), 2);
save_pointer(NAME(m_dac_level), 2);
save_pointer(NAME(m_fm_level), 2);
save_pointer(NAME(m_cd_level), 2);
save_pointer(NAME(m_linein_level), 2);
save_item(NAME(m_mic_level));
save_item(NAME(m_pc_speaker_level));
save_item(NAME(m_output_sw));
save_pointer(NAME(m_input_sw), 2);
save_pointer(NAME(m_input_gain), 2);
save_pointer(NAME(m_output_gain), 2);
save_item(NAME(m_agc));
save_pointer(NAME(m_treble), 2);
save_pointer(NAME(m_bass), 2);
}
void ct1745_mixer_device::device_reset()
{
m_index = 0;
reset_state();
}
void ct1745_mixer_device::reset_state()
{
m_master_level[0] = m_master_level[1] = 0xc0;
m_dac_level[0] = m_dac_level[1] = 0xc0;
m_fm_level[0] = m_fm_level[1] = 0xc0;
m_cd_level[0] = m_cd_level[1] = 0xc0;
m_linein_level[0] = m_linein_level[1] = 0;
m_mic_level = 0;
m_pc_speaker_level = 0x80;
m_output_sw = 0x1f;
m_input_sw[0] = 0x15;
m_input_sw[1] = 0x0b;
m_input_gain[0] = m_input_gain[1] = 0x00;
m_output_gain[0] = m_output_gain[1] = 0x00;
m_treble[0] = m_treble[1] = 0x80;
m_bass[0] = m_bass[1] = 0x80;
m_agc = false;
//m_dac_speaker_off = true;
update_gain_levels();
}
void ct1745_mixer_device::dac_speaker_off_cb(int state)
{
m_dac_speaker_off = !!state;
update_gain_levels();
}
u8 ct1745_mixer_device::read(offs_t offset)
{
if (offset == 0)
return m_index;
return space().read_byte(m_index);
}
void ct1745_mixer_device::write(offs_t offset, u8 data)
{
if (offset == 0)
{
m_index = data;
return;
}
space().write_byte(m_index, data);
if (!BIT(m_index, 7))
update_gain_levels();
}
// TODO: bare copy of HLE version, convert to sound_stream_update instead
void ct1745_mixer_device::update_gain_levels()
{
float lmain = m_master_level[0]/248.0;
float rmain = m_master_level[1]/248.0;
m_ldac->set_output_gain(ALL_OUTPUTS, m_dac_speaker_off ? 0.0 : lmain*(m_dac_level[0]/248.0f));
m_rdac->set_output_gain(ALL_OUTPUTS, m_dac_speaker_off ? 0.0 : rmain*(m_dac_level[1]/248.0f));
m_fm->set_output_gain(0, lmain*(m_fm_level[0]/248.0f));
m_fm->set_output_gain(1, rmain*(m_fm_level[1]/248.0f));
m_fm->set_output_gain(2, lmain*(m_fm_level[0]/248.0f));
m_fm->set_output_gain(3, rmain*(m_fm_level[1]/248.0f));
// TODO: convert to LIVE_AUDIO_VIEW
//popmessage("%f %f (%02x %02x) | %02x %02x | %02x %02x", lmain, rmain, m_master_level[0], m_master_level[1], m_dac_level[0], m_dac_level[1], m_fm_level[0], m_fm_level[1]);
}
void ct1745_mixer_device::map(address_map &map)
{
map(0x00, 0x00).lw8(
NAME([this] (offs_t offset, u8 data) {
// TODO: requires that the index is loaded by a set time first.
if (!BIT(data, 0))
reset_state();
})
);
// SB1/2 compatibility section
map(0x04, 0x04).lrw8(
NAME([this] (offs_t offset) {
return (m_dac_level[0] & 0xf0) | (m_dac_level[1] >> 4);
}),
NAME([this] (offs_t offset, u8 data) {
m_dac_level[0] = (data & 0xf0) | 8;
m_dac_level[1] = ((data & 0x0f) << 4) | 8;
})
);
// map(0x06, 0x06) FM Output Control?
// map(0x0a, 0x0a) Microphone level?
// map(0x0c, 0x0c) Input/Filter Select
// RMW (to the index!?) by ibm5170_cdrom:zyclunt, should be "Output Filter/Stereo Select"
// map(0x0e, 0x0e).lr8(NAME([] () { return 0x02; })); // Output/Stereo Select
map(0x22, 0x22).lrw8(
NAME([this] (offs_t offset) {
return (m_master_level[0] & 0xf0) | (m_master_level[1] >> 4);
}),
NAME([this] (offs_t offset, u8 data) {
m_master_level[0] = (data & 0xf0) | 8;
m_master_level[1] = ((data & 0x0f) << 4) | 8;
})
);
map(0x26, 0x26).lrw8(
NAME([this] (offs_t offset) {
return (m_fm_level[0] & 0xf0) | (m_fm_level[1] >> 4);
}),
NAME([this] (offs_t offset, u8 data) {
m_fm_level[0] = (data & 0xf0) | 8;
m_fm_level[1] = ((data & 0x0f) << 4) | 8;
})
);
map(0x26, 0x26).lrw8(
NAME([this] (offs_t offset) {
return (m_cd_level[0] & 0xf0) | (m_cd_level[1] >> 4);
}),
NAME([this] (offs_t offset, u8 data) {
m_cd_level[0] = (data & 0xf0) | 8;
m_cd_level[1] = ((data & 0x0f) << 4) | 8;
})
);
map(0x2e, 0x2e).lrw8(
NAME([this] (offs_t offset) {
return (m_linein_level[0] & 0xf0) | (m_linein_level[1] >> 4);
}),
NAME([this] (offs_t offset, u8 data) {
m_linein_level[0] = (data & 0xf0) | 8;
m_linein_level[1] = ((data & 0x0f) << 4) | 8;
})
);
map(0x30, 0x31).lrw8(
NAME([this] (offs_t offset) {
return m_master_level[offset & 1];
}),
NAME([this] (offs_t offset, u8 data) {
m_master_level[offset & 1] = data & 0xf8;
})
);
map(0x32, 0x33).lrw8(
NAME([this] (offs_t offset) {
return m_dac_level[offset & 1];
}),
NAME([this] (offs_t offset, u8 data) {
m_dac_level[offset & 1] = data & 0xf8;
})
);
map(0x34, 0x35).lrw8(
NAME([this] (offs_t offset) {
return m_fm_level[offset & 1];
}),
NAME([this] (offs_t offset, u8 data) {
m_fm_level[offset & 1] = data & 0xf8;
})
);
map(0x36, 0x37).lrw8(
NAME([this] (offs_t offset) {
return m_cd_level[offset & 1];
}),
NAME([this] (offs_t offset, u8 data) {
m_cd_level[offset & 1] = data & 0xf8;
})
);
map(0x38, 0x39).lrw8(
NAME([this] (offs_t offset) {
return m_linein_level[offset & 1];
}),
NAME([this] (offs_t offset, u8 data) {
m_linein_level[offset & 1] = data & 0xf8;
})
);
map(0x3a, 0x3a).lrw8(
NAME([this] (offs_t offset) {
return m_mic_level;
}),
NAME([this] (offs_t offset, u8 data) {
m_mic_level = data & 0xf8;
})
);
map(0x3b, 0x3b).lrw8(
NAME([this] (offs_t offset) {
return m_pc_speaker_level;
}),
NAME([this] (offs_t offset, u8 data) {
m_pc_speaker_level = data & 0xc0;
})
);
map(0x3c, 0x3c).lrw8(
NAME([this] (offs_t offset) {
return m_output_sw;
}),
NAME([this] (offs_t offset, u8 data) {
m_output_sw = data & 0x1f;
})
);
// NOTE: start section where L/R are A0 swapped ...
map(0x3d, 0x3e).lrw8(
NAME([this] (offs_t offset) {
return m_input_sw[(offset & 1) ^ 1];
}),
NAME([this] (offs_t offset, u8 data) {
m_input_sw[(offset & 1) ^ 1] = data & 0x7f;
})
);
map(0x3f, 0x40).lrw8(
NAME([this] (offs_t offset) {
return m_input_gain[(offset & 1) ^ 1];
}),
NAME([this] (offs_t offset, u8 data) {
m_input_gain[(offset & 1) ^ 1] = data & 0xc0;
})
);
map(0x41, 0x42).lrw8(
NAME([this] (offs_t offset) {
return m_output_gain[(offset & 1) ^ 1];
}),
NAME([this] (offs_t offset, u8 data) {
m_output_gain[(offset & 1) ^ 1] = data & 0xc0;
})
);
// ... end section
map(0x43, 0x43).lrw8(
NAME([this] (offs_t offset) {
return m_agc;
}),
NAME([this] (offs_t offset, u8 data) {
m_agc = !!BIT(data, 0);
})
);
map(0x44, 0x45).lrw8(
NAME([this] (offs_t offset) {
return m_treble[offset & 1];
}),
NAME([this] (offs_t offset, u8 data) {
m_treble[offset & 1] = data & 0xf0;
})
);
map(0x46, 0x47).lrw8(
NAME([this] (offs_t offset) {
return m_bass[offset & 1];
}),
NAME([this] (offs_t offset, u8 data) {
m_bass[offset & 1] = data & 0xf0;
})
);
// PnP ports
// IRQ/DMA select
map(0x80, 0x80).lr8(NAME([] () { return 0x12; }));
map(0x81, 0x81).lr8(NAME([] () { return 0x22; }));
// IRQ Status
map(0x82, 0x82).lr8(NAME([this] () { return m_irq_status_cb(); }));
// ...
}
|