RP5C01.hh

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// This class implements the RP5C01 chip (RTC)
//
// * For technical details on RP5C01 see
//     http://w3.qahwah.net/joost/openMSX/RP5C01.pdf
 
#ifndef RP5C01_HH
#define RP5C01_HH
 
#include "Clock.hh"
#include "EnumSetting.hh"
#include "openmsx.hh"
#include <string>
 
namespace openmsx {
 
class CommandController;
class SRAM;
 
class RP5C01
{
public:
        enum RTCMode { EMUTIME, REALTIME };
 
        RP5C01(CommandController& commandController, SRAM& regs,
               EmuTime::param time, const std::string& name);
 
        void reset(EmuTime::param time);
        [[nodiscard]] nibble readPort(nibble port, EmuTime::param time);
        [[nodiscard]] nibble peekPort(nibble port) const;
        void writePort(nibble port, nibble value, EmuTime::param time);
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
private:
        void initializeTime();
        void updateTimeRegs(EmuTime::param time);
        void regs2Time();
        void time2Regs();
        void resetAlarm();
 
private:
        static constexpr unsigned FREQ = 16384;
 
        SRAM& regs;
        EnumSetting<RTCMode> modeSetting;
 
        Clock<FREQ> reference;
        unsigned fraction;
        unsigned seconds, minutes, hours;
        unsigned dayWeek, years, leapYear;
        int days, months; // these two can be -1
 
        nibble modeReg, testReg, resetReg;
};
 
} // namespace openmsx
 
#endif