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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
// Yamaha SWP20, rompler
#include "emu.h"
#include "swp20.h"
DEFINE_DEVICE_TYPE(SWP20, swp20_device, "swp20", "Yamaha SWP20 sound chip")
swp20_device::swp20_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, SWP20, tag, owner, clock),
device_sound_interface(mconfig, *this),
device_rom_interface(mconfig, *this)
{
}
void swp20_device::device_start()
{
}
void swp20_device::device_reset()
{
m_p3c_port = 0x00;
m_p3c_address = true;
m_voice = 0x00;
m_keyon = 0;
m_keyoff = 0;
}
void swp20_device::map(address_map &map)
{
map(0x00, 0x3f).rw(FUNC(swp20_device::snd_r), FUNC(swp20_device::snd_w));
map(0x3c, 0x3c).w(FUNC(swp20_device::p3c_w));
}
// init mu80:
// 48394: <- 47aea
// write 04.7f 00.14 01.90 to +3c
// write 01.90 80-ff, 473ea++
// write 01.94 80-ff, 4746a++
// write 01.98 80-ff, 474ea++
// write 01.9c 80-ff, 4756a++
// write 01.a0
// write 40-5f.data
// etc
void swp20_device::p3c_w(u8 data)
{
if(m_p3c_address)
m_p3c_port = data;
else
logerror("p3c %02x = %02x\n", m_p3c_port, data);
m_p3c_address = !m_p3c_address;
}
u8 swp20_device::snd_r(offs_t offset)
{
logerror("r %02x %s\n", offset, machine().describe_context());
return 0;
}
void swp20_device::snd_w(offs_t offset, u8 data)
{
// Registers 0-f are global, 10-3f per-voice
switch(offset) {
case 0x01:
m_voice = data & 0x1f;
break;
case 0x04: case 0x05: case 0x06: case 0x07: {
int off = 8*(offset & 3);
u32 mask = 0xff << off;
m_keyon = (m_keyon & ~mask) | (data << off);
logerror("keyon %08x\n", m_keyon);
break;
}
case 0x08: case 0x09: case 0x0a: case 0x0b: {
int off = 8*(offset & 3);
u32 mask = 0xff << off;
m_keyoff = (m_keyoff & ~mask) | (data << off);
logerror("keyoff %08x\n", m_keyoff);
break;
}
case 0x10: // freq high
break;
case 0x11: // freq low
break;
default:
logerror("w %02x.%02x, %02x %s\n", m_voice, offset, data, machine().describe_context());
}
}
void swp20_device::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs)
{
outputs[0].fill(0);
}
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