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// license:BSD-3-Clause
// copyright-holders:windyfairy
/***************************************************************************
Sanyo LC78836M Digital Audio 16-bit D/A Converter
with On-Chip Digital Filters
____ ____
REFH 1 | \_/ | 24 AVDD
VrefH 2 | | 23 CH1OUT
MUTE 3 | | 22 AGND
D/N 4 | | 21 CH2OUT
BCLK 5 | | 20 REFL
DATA 6 | LC78836M | 19 VrefL
LRCK 7 | | 18 CKSL2
DVDD 8 | | 17 CKSL1
CKOUT 9 | | 16 FS2
XOUT 10 | | 15 FS1
XIN 11 | | 14 EMP
DGND 12 |___________| 13 INITB
TOOD:
- INITB, DN aren't implemented
- Filters aren't implemented
***************************************************************************/
#include "emu.h"
#include "lc78836m.h"
// #define VERBOSE (LOG_GENERAL)
#include "logmacro.h"
DEFINE_DEVICE_TYPE(LC78836M, lc78836m_device, "lc78836m", "Sanyo LC78836M Digital Audio 16-bit D/A Converter")
lc78836m_device::lc78836m_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, LC78836M, tag, owner, clock)
, device_sound_interface(mconfig, *this)
, m_stream(nullptr)
, m_cksl1(0), m_cksl2(0)
, m_fs1(0), m_fs2(0)
, m_emp(0)
{
}
void lc78836m_device::device_start()
{
save_item(NAME(m_cksl1));
save_item(NAME(m_cksl2));
save_item(NAME(m_fs1));
save_item(NAME(m_fs2));
save_item(NAME(m_emp));
save_item(NAME(m_mute));
save_item(NAME(m_lrck));
save_item(NAME(m_data));
save_item(NAME(m_bclk));
save_item(NAME(m_sample));
save_item(NAME(m_sample_bit));
save_item(NAME(m_clock_fs));
save_item(NAME(m_sample_ch1));
save_item(NAME(m_sample_ch2));
save_item(NAME(m_att));
m_stream = stream_alloc(2, 2, m_clock);
}
void lc78836m_device::device_reset()
{
m_mute = 0;
m_lrck = 0;
m_data = 0;
m_bclk = 0;
m_sample = 0;
m_sample_bit = 0;
m_att = 1024;
m_sample_ch1 = m_sample_ch2 = 0;
update_clock();
}
void lc78836m_device::device_clock_changed()
{
update_clock();
}
void lc78836m_device::sound_stream_update(sound_stream &stream)
{
stream.put(0, 0, m_sample_ch1 * m_att / 1024.0);
m_sample_ch1 = 0;
stream.put(1, 0, m_sample_ch2 * m_att / 1024.0);
m_sample_ch2 = 0;
if (m_mute && m_att > 0)
m_att--;
else if (!m_mute && m_att < 1024)
m_att++;
}
void lc78836m_device::mute_w(int state)
{
// Soft mute
m_mute = state;
}
void lc78836m_device::lrck_w(int state)
{
// CH1 when high, CH2 when low
m_lrck = state;
}
void lc78836m_device::data_w(int state)
{
m_data = state;
}
void lc78836m_device::bclk_w(int state)
{
if (!m_bclk && state) {
m_sample |= m_data << m_sample_bit;
m_sample_bit++;
if (m_sample_bit >= 16) {
sound_stream::sample_t sample = m_sample / double(std::numeric_limits<int16_t>::max());
if (m_lrck)
m_sample_ch1 = sample;
else
m_sample_ch2 = sample;
m_sample = 0;
m_sample_bit = 0;
m_stream->update();
}
}
m_bclk = state;
}
void lc78836m_device::initb_w(int state)
{
// Initialization signal input
// LSI is initialized when set low
m_initb = state;
}
void lc78836m_device::cksl1_w(int state)
{
// System clock selection bit 1
if (state != m_cksl1) {
m_cksl1 = state;
update_clock();
}
}
void lc78836m_device::cksl2_w(int state)
{
// System clock selection bit 2
if (state != m_cksl2) {
m_cksl2 = state;
update_clock();
}
}
void lc78836m_device::fs1_w(int state)
{
// De-emphasis filter mode selection bit 1
m_fs1 = state;
}
void lc78836m_device::fs2_w(int state)
{
// De-emphasis filter mode selection bit 2
m_fs2 = state;
}
void lc78836m_device::emp_w(int state)
{
// De-emphasis filter on/off
m_emp = state;
}
void lc78836m_device::update_clock()
{
if (m_cksl1 == 0 && m_cksl2 == 0)
m_clock_fs = 384;
else if (m_cksl1 == 0 && m_cksl2 == 1)
m_clock_fs = 392;
else if (m_cksl1 == 1 && m_cksl2 == 0)
m_clock_fs = 448;
else if (m_cksl1 == 1 && m_cksl2 == 1)
m_clock_fs = 512;
const uint32_t new_sample_rate = m_clock / m_clock_fs;
if (m_stream != nullptr && new_sample_rate != m_stream->sample_rate()) {
LOG("sample rate changed to %d\n", new_sample_rate);
m_stream->set_sample_rate(new_sample_rate);
}
}
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