MSXOPL3Cartridge.cc

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#include "MSXOPL3Cartridge.hh"
#include "serialize.hh"
#include "unreachable.hh"
 
namespace openmsx {
 
MSXOPL3Cartridge::MSXOPL3Cartridge(const DeviceConfig& config)
        : MSXDevice(config)
        , ymf262(getName(), config, false)
{
        reset(getCurrentTime());
}
 
void MSXOPL3Cartridge::reset(EmuTime::param time)
{
        ymf262.reset(time);
 
        // TODO check
        opl3latch = 0;
}
 
byte MSXOPL3Cartridge::readIO(word port, EmuTime::param /*time*/)
{
        // FM part  0xC4-0xC7 (in MoonSound)
        switch (port & 0x03) {
                case 0: // read status
                case 2:
                        return ymf262.readStatus();
                case 1:
                case 3: // read fm register
                        return ymf262.readReg(opl3latch);
                default:
                        UNREACHABLE;
        }
}
 
byte MSXOPL3Cartridge::peekIO(word port, EmuTime::param /*time*/) const
{
        switch (port & 0x03) {
                case 0: // read status
                case 2:
                        return ymf262.peekStatus();
                case 1:
                case 3: // read fm register
                        return ymf262.peekReg(opl3latch);
                default:
                        UNREACHABLE;
        }
}
 
void MSXOPL3Cartridge::writeIO(word port, byte value, EmuTime::param time)
{
        switch (port & 0x03) {
                case 0: // select register bank 0
                        opl3latch = value;
                        break;
                case 2: // select register bank 1
                        opl3latch = value | 0x100;
                        break;
                case 1:
                case 3: // write fm register
                        ymf262.writeReg(opl3latch, value, time);
                        break;
                default:
                        UNREACHABLE;
        }
}
 
template<typename Archive>
void MSXOPL3Cartridge::serialize(Archive& ar, unsigned /*version*/)
{
        ar.template serializeBase<MSXDevice>(*this);
        ar.serialize("ymf262",    ymf262,
                     "opl3latch", opl3latch);
}
INSTANTIATE_SERIALIZE_METHODS(MSXOPL3Cartridge);
REGISTER_MSXDEVICE(MSXOPL3Cartridge, "OPL3Cartridge");
 
} // namespace openmsx