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◆ main openmsx / src / sound / MSXOPL3Cartridge.cc
1.6 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "MSXOPL3Cartridge.hh"
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#include "serialize.hh"
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#include "unreachable.hh"
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namespace openmsx {
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MSXOPL3Cartridge::MSXOPL3Cartridge(const DeviceConfig& config)
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	: MSXDevice(config)
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	, ymf262(getName(), config, false)
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{
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	reset(getCurrentTime());
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}
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void MSXOPL3Cartridge::reset(EmuTime time)
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{
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	ymf262.reset(time);
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	// TODO check
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	opl3latch = 0;
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}
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byte MSXOPL3Cartridge::readIO(uint16_t port, EmuTime /*time*/)
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{
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	// FM part  0xC4-0xC7 (in MoonSound)
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	switch (port & 0x03) {
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		case 0: // read status
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		case 2:
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			return ymf262.readStatus();
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		case 1:
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		case 3: // read fm register
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			return ymf262.readReg(opl3latch);
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		default:
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			UNREACHABLE;
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	}
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}
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byte MSXOPL3Cartridge::peekIO(uint16_t port, EmuTime /*time*/) const
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{
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	switch (port & 0x03) {
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		case 0: // read status
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		case 2:
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			return ymf262.peekStatus();
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		case 1:
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		case 3: // read fm register
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			return ymf262.peekReg(opl3latch);
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		default:
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			UNREACHABLE;
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	}
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}
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void MSXOPL3Cartridge::writeIO(uint16_t port, byte value, EmuTime time)
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{
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	switch (port & 0x03) {
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		case 0: // select register bank 0
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			opl3latch = value;
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			break;
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		case 2: // select register bank 1
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			opl3latch = value | 0x100;
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			break;
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		case 1:
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		case 3: // write fm register
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			ymf262.writeReg(opl3latch, value, time);
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			break;
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		default:
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			UNREACHABLE;
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	}
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}
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template<typename Archive>
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void MSXOPL3Cartridge::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.template serializeBase<MSXDevice>(*this);
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	ar.serialize("ymf262",    ymf262,
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	             "opl3latch", opl3latch);
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}
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INSTANTIATE_SERIALIZE_METHODS(MSXOPL3Cartridge);
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REGISTER_MSXDEVICE(MSXOPL3Cartridge, "OPL3Cartridge");
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} // namespace openmsx