tod.h

/*
 * This file is part of libsidplayfp, a SID player engine.
 *
 * Copyright 2011-2018 Leandro Nini <drfiemost@users.sourceforge.net>
 * Copyright 2009-2014 VICE Project
 * Copyright 2007-2010 Antti Lankila
 * Copyright 2000 Simon White
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
 
#ifndef TOD_H
#define TOD_H
 
#include <stdint.h>
 
#include "sidplayfp/event.h"
 
class MOS6526;
 
class Tod : private Event
{
private:
    enum
    {
        TENTHS  = 0,
        SECONDS = 1,
        MINUTES = 2,
        HOURS   = 3
    };
 
private:
    EventContext &event_context;
 
    MOS6526* const parent;
 
    event_clock_t cycles;
    event_clock_t period;
 
    unsigned int todtickcounter;
 
    uint8_t clock[4];
    uint8_t latch[4];
    uint8_t alarm[4];
 
    const uint8_t &cra;
    const uint8_t &crb;
 
    bool isLatched;
    bool isStopped;
 
private:
    inline void checkAlarm();
 
    inline void updateCounters();
 
    void event();
 
public:
    Tod(EventContext *context, MOS6526* parent, uint8_t regs[0x10]) :
        Event("CIA Time of Day"),
        event_context(*context),
        parent(parent),
        period(~0), // Dummy
        todtickcounter(0),
        cra(regs[0x0e]),
        crb(regs[0x0f]) {}
 
    void reset();
 
    uint8_t read(uint_least8_t reg);
 
    void write(uint_least8_t reg, uint8_t data);
 
    void setPeriod(event_clock_t clock) { period = clock * (1 << 7); }
};
 
#endif