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◆ main openmsx / src / sound / MSXAudio.cc
3.2 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "MSXAudio.hh"
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#include "DACSound8U.hh"
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#include "Y8950Periphery.hh"
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#include "serialize.hh"
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#include "StringOp.hh"
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#include <memory>
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namespace openmsx {
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// MSXAudio
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MSXAudio::MSXAudio(const DeviceConfig& config)
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	: MSXDevice(config)
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	, y8950(getName(), config,
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	        config.getChildDataAsInt("sampleram", 256) * 1024,
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	        getCurrentTime(), *this)
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{
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	auto type = config.getChildData("type", "philips");
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	if (StringOp::casecmp cmp; cmp(type, "philips")) {
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		dac = std::make_unique<DACSound8U>(
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			getName() + " 8-bit DAC", "MSX-AUDIO 8-bit DAC",
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			config);
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	}
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	powerUp(getCurrentTime());
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}
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MSXAudio::~MSXAudio()
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{
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	// delete soon, because PanasonicAudioPeriphery still uses
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	// this object in its destructor
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	periphery.reset();
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}
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Y8950Periphery& MSXAudio::createPeriphery(const std::string& soundDeviceName)
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{
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	periphery = Y8950PeripheryFactory::create(
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		*this, getDeviceConfig2(), soundDeviceName);
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	return *periphery;
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}
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void MSXAudio::powerUp(EmuTime time)
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{
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	y8950.clearRam();
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	reset(time);
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}
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void MSXAudio::reset(EmuTime time)
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{
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	y8950.reset(time);
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	periphery->reset();
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	registerLatch = 0; // TODO check
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}
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byte MSXAudio::readIO(uint16_t port, EmuTime time)
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{
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	if ((port & 0xE8) == 0x08) {
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		// read DAC
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		return 0xFF;
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	} else {
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		return (port & 1) ? y8950.readReg(registerLatch, time)
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		                  : y8950.readStatus(time);
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	}
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}
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byte MSXAudio::peekIO(uint16_t port, EmuTime time) const
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{
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	if ((port & 0xE8) == 0x08) {
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		// read DAC
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		return 0xFF; // read always returns 0xFF
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	} else {
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		return (port & 1) ? y8950.peekReg(registerLatch, time)
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		                  : y8950.peekStatus(time);
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	}
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}
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void MSXAudio::writeIO(uint16_t port, byte value, EmuTime time)
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{
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	if ((port & 0xE8) == 0x08) {
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		dacValue = value;
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		if (dacEnabled) {
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			assert(dac);
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			dac->writeDAC(dacValue, time);
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		}
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	} else if ((port & 0x01) == 0) {
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		// 0xC0 or 0xC2
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		registerLatch = value;
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	} else {
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		// 0xC1 or 0xC3
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		y8950.writeReg(registerLatch, value, time);
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	}
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}
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byte MSXAudio::readMem(uint16_t address, EmuTime time)
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{
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	return periphery->readMem(address, time);
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}
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byte MSXAudio::peekMem(uint16_t address, EmuTime time) const
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{
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	return periphery->peekMem(address, time);
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}
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void MSXAudio::writeMem(uint16_t address, byte value, EmuTime time)
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{
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	periphery->writeMem(address, value, time);
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}
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const byte* MSXAudio::getReadCacheLine(uint16_t start) const
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{
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	return periphery->getReadCacheLine(start);
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}
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byte* MSXAudio::getWriteCacheLine(uint16_t start)
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{
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	return periphery->getWriteCacheLine(start);
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}
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void MSXAudio::enableDAC(bool enable, EmuTime time)
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{
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	if ((dacEnabled != enable) && dac) {
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		dacEnabled = enable;
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		byte value = dacEnabled ? dacValue : 0x80;
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		dac->writeDAC(value, time);
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	}
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}
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template<typename Archive>
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void MSXAudio::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.serializePolymorphic("periphery", *periphery);
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	ar.serialize("Y8950",         y8950,
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	             "registerLatch", registerLatch,
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	             "dacValue",      dacValue,
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	             "dacEnabled",    dacEnabled);
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	if constexpr (Archive::IS_LOADER) {
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		// restore dac status
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		if (dacEnabled) {
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			assert(dac);
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			dac->writeDAC(dacValue, getCurrentTime());
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		}
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	}
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}
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INSTANTIATE_SERIALIZE_METHODS(MSXAudio);
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REGISTER_MSXDEVICE(MSXAudio, "MSX-Audio");
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} // namespace openmsx