c64cia.h
/*
* This file is part of libsidplayfp, a SID player engine.
*
* Copyright 2011-2021 Leandro Nini <drfiemost@users.sourceforge.net>
* Copyright 2007-2010 Antti Lankila
* Copyright 2001 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 C64CIA_H
#define C64CIA_H
// The CIA emulations are very generic and here we need to effectively
// wire them into the computer (like adding a chip to a PCB).
#include "Banks/Bank.h"
#include "c64/c64env.h"
#include "sidendian.h"
#include "CIA/mos652x.h"
#include "sidcxx11.h"
namespace libsidplayfp
{
class c64cia1 final : public MOS652X, public Bank
{
private:
c64env &m_env;
uint_least16_t last_ta;
protected:
void interrupt(bool state) override
{
m_env.interruptIRQ(state);
}
void portB() override
{
const uint8_t pb = prb | ~ddrb;
// We should call adjustDataPort here
// but we're only interested in bit 4
m_env.lightpen(pb & 0x10);
}
public:
c64cia1(c64env &env) :
MOS652X(env.scheduler()),
m_env(env) {}
void poke(uint_least16_t address, uint8_t value) override
{
const uint8_t addr = endian_16lo8(address);
write(addr, value);
// Save the value written to Timer A
if ((addr == 0x04) || (addr == 0x05))
{
if (timerA.getTimer() != 0)
last_ta = timerA.getTimer();
}
}
uint8_t peek(uint_least16_t address) override
{
return read(endian_16lo8(address));
}
void reset() override
{
last_ta = 0;
MOS652X::reset();
}
uint_least16_t getTimerA() const { return last_ta; }
};
class c64cia2 : public MOS652X, public Bank
{
private:
c64env &m_env;
protected:
void interrupt(bool state) override
{
if (state)
m_env.interruptNMI();
}
public:
c64cia2(c64env &env) :
MOS652X(env.scheduler()),
m_env(env) {}
void poke(uint_least16_t address, uint8_t value) override
{
write(endian_16lo8(address), value);
}
uint8_t peek(uint_least16_t address) override
{
return read(endian_16lo8(address));
}
};
}
#endif // C64CIA_H
libsidplayfp::Bank
Definition Bank.h:36
libsidplayfp::MOS652X
Definition mos652x.h:154
libsidplayfp::MOS652X::timerA
TimerA timerA
Timers A and B.
Definition mos652x.h:186
libsidplayfp::MOS652X::write
void write(uint_least8_t addr, uint8_t data)
Definition mos652x.cpp:221
libsidplayfp::MOS652X::reset
virtual void reset()
Definition mos652x.cpp:146
libsidplayfp::MOS652X::read
uint8_t read(uint_least8_t addr)
Definition mos652x.cpp:182
libsidplayfp::Timer::getTimer
uint_least16_t getTimer() const
Definition timer.h:207
libsidplayfp::c64cia1
Definition c64cia.h:47
libsidplayfp::c64cia1::reset
void reset() override
Definition c64cia.h:89
libsidplayfp::c64cia1::poke
void poke(uint_least16_t address, uint8_t value) override
Definition c64cia.h:71
libsidplayfp::c64cia1::interrupt
void interrupt(bool state) override
Definition c64cia.h:53
libsidplayfp::c64cia1::peek
uint8_t peek(uint_least16_t address) override
Definition c64cia.h:84
libsidplayfp::c64cia2
Definition c64cia.h:106
libsidplayfp::c64cia2::poke
void poke(uint_least16_t address, uint8_t value) override
Definition c64cia.h:122
libsidplayfp::c64cia2::peek
uint8_t peek(uint_least16_t address) override
Definition c64cia.h:127
libsidplayfp::c64cia2::interrupt
void interrupt(bool state) override
Definition c64cia.h:111
libsidplayfp::c64env
Definition c64env.h:41