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/*
* Interfaces over Yamaha OPL3 (YMF262) chip emulators
*
* Copyright (c) 2017-2025 Vitaly Novichkov (Wohlstand)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef ENABLE_HW_OPL_SERIAL_PORT
#include "opl_serial_port.h"
#include "opl_serial_misc.h"
static size_t retrowave_protocol_serial_pack(const uint8_t *buf_in, size_t len_in, uint8_t *buf_out)
{
size_t in_cursor = 0;
size_t out_cursor = 0;
buf_out[out_cursor] = 0x00;
out_cursor += 1;
uint8_t shift_count = 0;
while(in_cursor < len_in)
{
uint8_t cur_byte_out = buf_in[in_cursor] >> shift_count;
if(in_cursor > 0)
cur_byte_out |= (buf_in[in_cursor - 1] << (8 - shift_count));
cur_byte_out |= 0x01;
buf_out[out_cursor] = cur_byte_out;
shift_count += 1;
in_cursor += 1;
out_cursor += 1;
if(shift_count > 7)
{
shift_count = 0;
in_cursor -= 1;
}
}
if(shift_count)
{
buf_out[out_cursor] = buf_in[in_cursor - 1] << (8 - shift_count);
buf_out[out_cursor] |= 0x01;
out_cursor += 1;
}
buf_out[out_cursor] = 0x02;
out_cursor += 1;
return out_cursor;
}
OPL_SerialPort::OPL_SerialPort()
: m_port(NULL), m_protocol(ProtocolUnknown)
{}
OPL_SerialPort::~OPL_SerialPort()
{
delete m_port;
m_port = NULL;
}
bool OPL_SerialPort::connectPort(const std::string& name, unsigned baudRate, unsigned protocol)
{
delete m_port;
m_port = NULL;
// ensure audio thread reads protocol atomically and in order,
// so chipType() will be correct after the port is live
m_protocol = protocol;
// QSerialPort *port = m_port = new QSerialPort(name);
// port->setBaudRate(baudRate);
// return port->open(QSerialPort::WriteOnly);
m_port = new ChipSerialPort;
return m_port->open(name, baudRate);
}
bool OPL_SerialPort::hasFullPanning()
{
return false;
}
void OPL_SerialPort::writeReg(uint16_t addr, uint8_t data)
{
uint8_t sendBuffer[16];
ChipSerialPortBase *port = m_port;
if(!port || !port->isOpen())
return;
switch(m_protocol)
{
default:
case ProtocolArduinoOPL2:
{
if(addr >= 0x100)
break;
sendBuffer[0] = (uint8_t)addr;
sendBuffer[1] = (uint8_t)data;
port->write(sendBuffer, 2);
break;
}
case ProtocolNukeYktOPL3:
{
sendBuffer[0] = (addr >> 6) | 0x80;
sendBuffer[1] = ((addr & 0x3f) << 1) | (data >> 7);
sendBuffer[2] = (data & 0x7f);
port->write(sendBuffer, 3);
break;
}
case ProtocolRetroWaveOPL3:
{
bool port1 = (addr & 0x100) != 0;
uint8_t buf[8] =
{
static_cast<uint8_t>(0x21 << 1), 0x12,
static_cast<uint8_t>(port1 ? 0xe5 : 0xe1), static_cast<uint8_t>(addr & 0xff),
static_cast<uint8_t>(port1 ? 0xe7 : 0xe3), static_cast<uint8_t>(data),
0xfb, static_cast<uint8_t>(data)
};
size_t packed_len = retrowave_protocol_serial_pack(buf, sizeof(buf), sendBuffer);
port->write(sendBuffer, packed_len);
break;
}
}
}
void OPL_SerialPort::nativeGenerate(int16_t *frame)
{
frame[0] = 0;
frame[1] = 0;
}
const char *OPL_SerialPort::emulatorName()
{
return "OPL Serial Port Driver";
}
OPLChipBase::ChipType OPL_SerialPort::chipType()
{
switch(m_protocol)
{
default:
case ProtocolArduinoOPL2:
return OPLChipBase::CHIPTYPE_OPL2;
case ProtocolNukeYktOPL3:
case ProtocolRetroWaveOPL3:
return OPLChipBase::CHIPTYPE_OPL3;
}
}
#endif // ENABLE_HW_OPL_SERIAL_PORT
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