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◆ main openmsx / src / sound / MSXYamahaSFG.cc
4.3 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "MSXYamahaSFG.hh"
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#include "CacheLine.hh"
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#include "serialize.hh"
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namespace openmsx {
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static YM2151::Variant parseVariant(const DeviceConfig& config)
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{
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	auto variant = config.getChildData("variant", "YM2151");
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	if (variant == "YM2151") return YM2151::Variant::YM2151;
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	if (variant == "YM2164") return YM2151::Variant::YM2164;
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	throw MSXException("Invalid variant '", variant, "', expected 'YM2151' or 'YM2164'.");
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}
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MSXYamahaSFG::MSXYamahaSFG(DeviceConfig& config)
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	: MSXDevice(config)
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	, rom(getName() + " ROM", "rom", config)
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	, ym2151(getName(), "Yamaha SFG-01/05", config, getCurrentTime(), parseVariant(config))
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	, ym2148(getName(), getMotherBoard())
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{
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	reset(getCurrentTime());
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}
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void MSXYamahaSFG::reset(EmuTime time)
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{
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	ym2151.reset(time);
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	ym2148.reset();
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	registerLatch = 0; // TODO check
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	irqVector = 255; // TODO check
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	irqVector2148 = 255; // TODO check
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}
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void MSXYamahaSFG::writeMem(uint16_t address, byte value, EmuTime time)
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{
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	uint16_t maskedAddress = address & 0x3FFF;
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	switch (maskedAddress) {
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	case 0x3FF0: // OPM ADDRESS REGISTER
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		writeRegisterPort(value, time);
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		break;
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	case 0x3FF1: // OPM DATA REGISTER
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		writeDataPort(value, time);
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		break;
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	case 0x3FF2: // Register for data latched to ST0 to ST7 output ports
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		// TODO: keyboardLatch = value;
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		//std::cerr << "TODO: keyboardLatch = " << (int)value << '\n';
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		break;
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	case 0x3FF3: // MIDI IRQ VECTOR ADDRESS REGISTER
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		irqVector2148 = value;
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		break;
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	case 0x3FF4: // EXTERNAL IRQ VECTOR ADDRESS REGISTER
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		// IRQ vector for YM2151 (+ default vector ???)
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		irqVector = value;
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		break;
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	case 0x3FF5: // MIDI standard UART DATA WRITE BUFFER
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		ym2148.writeData(value, time);
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		break;
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	case 0x3FF6: // MIDI standard UART COMMAND REGISTER
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		ym2148.writeCommand(value);
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		break;
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	}
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}
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byte* MSXYamahaSFG::getWriteCacheLine(uint16_t start)
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{
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	if ((start & 0x3FFF & CacheLine::HIGH) == (0x3FF0 & CacheLine::HIGH)) {
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		return nullptr;
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	}
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	return unmappedWrite.data();
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}
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byte MSXYamahaSFG::readIRQVector()
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{
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	return ym2148.pendingIRQ() ? irqVector2148 : irqVector;
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}
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void MSXYamahaSFG::writeRegisterPort(byte value, EmuTime /*time*/)
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{
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	registerLatch = value;
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}
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void MSXYamahaSFG::writeDataPort(byte value, EmuTime time)
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{
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	ym2151.writeReg(registerLatch, value, time);
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}
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byte MSXYamahaSFG::readMem(uint16_t address, EmuTime time)
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{
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	uint16_t maskedAddress = address & 0x3FFF;
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	if (maskedAddress < 0x3FF0 || maskedAddress >= 0x3FF8) {
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		return peekMem(address, time);
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	}
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	switch (maskedAddress) {
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	case 0x3FF0: // (not used, it seems)
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	case 0x3FF1: // OPM STATUS REGISTER
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	case 0x3FF2: // Data buffer for SD0 to SD7 input ports
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		return peekMem(address, time);
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	case 0x3FF5: // MIDI standard UART DATA READ BUFFER
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		return ym2148.readData(time);
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	case 0x3FF6: // MIDI standard UART STATUS REGISTER
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		return ym2148.readStatus(time);
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	}
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	return 0xFF;
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}
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byte MSXYamahaSFG::peekMem(uint16_t address, EmuTime time) const
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{
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	uint16_t maskedAddress = address & 0x3FFF;
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	if (maskedAddress < 0x3FF0 || maskedAddress >= 0x3FF8) {
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		// size can also be 16kB for SFG-01 or 32kB for SFG-05
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		return rom[address & (rom.size() - 1)];
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	}
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	switch (maskedAddress) {
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	case 0x3FF0: // (not used, it seems)
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		return 0xFF;
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	case 0x3FF1: // OPM STATUS REGISTER
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		return ym2151.readStatus();
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	case 0x3FF2: // Data buffer for SD0 to SD7 input ports
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		// TODO: return getKbdStatus();
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		break;
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	case 0x3FF5: // MIDI standard UART DATA READ BUFFER
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		return ym2148.peekData(time);
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	case 0x3FF6: // MIDI standard UART STATUS REGISTER
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		return ym2148.peekStatus(time);
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	}
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	return 0xFF;
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}
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const byte* MSXYamahaSFG::getReadCacheLine(uint16_t start) const
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{
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	if ((start & 0x3FFF & CacheLine::HIGH) == (0x3FF0 & CacheLine::HIGH)) {
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		return nullptr;
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	}
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	return &rom[start & (rom.size() - 1)];
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}
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// version 1: initial version
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// version 2: moved irqVector2148 from ym2148 to here
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template<typename Archive>
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void MSXYamahaSFG::serialize(Archive& ar, unsigned version)
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{
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	ar.serialize("YM2151",        ym2151,
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	             "YM2148",        ym2148,
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	             "registerLatch", registerLatch,
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	             "irqVector",     irqVector);
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	if (ar.versionAtLeast(version, 2)) {
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		ar.serialize("irqVector2148", irqVector2148);
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	} else {
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		irqVector2148 = 255; // could be retrieved from the old ym2148
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		                     // savestate data, but I didn't bother
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	}
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}
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INSTANTIATE_SERIALIZE_METHODS(MSXYamahaSFG);
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REGISTER_MSXDEVICE(MSXYamahaSFG, "YamahaSFG");
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} // namespace openmsx