MSXRTC.cc

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#include "MSXRTC.hh"
#include "serialize.hh"
#include "unreachable.hh"
 
namespace openmsx {
 
MSXRTC::MSXRTC(const DeviceConfig& config)
        : MSXDevice(config)
        , sram(getName() + " SRAM", 4 * 13, config)
        , rp5c01(getCommandController(), sram, getCurrentTime(), getName())
{
        reset(getCurrentTime());
}
 
void MSXRTC::reset(EmuTime::param time)
{
        // TODO verify on real hardware .. how?
        //  - registerLatch set to zero or some other value?
        //  - only on power-up or also on reset?
        registerLatch = 0;
        rp5c01.reset(time);
}
 
byte MSXRTC::readIO(word /*port*/, EmuTime::param time)
{
        return rp5c01.readPort(registerLatch, time) | 0xF0;
}
 
byte MSXRTC::peekIO(word /*port*/, EmuTime::param /*time*/) const
{
        return rp5c01.peekPort(registerLatch) | 0xF0;
}
 
void MSXRTC::writeIO(word port, byte value, EmuTime::param time)
{
        switch (port & 0x01) {
        case 0:
                registerLatch = value & 0x0F;
                break;
        case 1:
                rp5c01.writePort(registerLatch, value & 0x0F, time);
                break;
        default:
                UNREACHABLE;
        }
}
 
template<typename Archive>
void MSXRTC::serialize(Archive& ar, unsigned /*version*/)
{
        ar.template serializeBase<MSXDevice>(*this);
        ar.serialize("sram",          sram,
                     "rp5c01",        rp5c01,
                     "registerLatch", registerLatch);
}
INSTANTIATE_SERIALIZE_METHODS(MSXRTC);
REGISTER_MSXDEVICE(MSXRTC, "RTC");
 
} // namespace openmsx