132 lines
2.8 KiB
Plaintext
132 lines
2.8 KiB
Plaintext
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/*
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* This file is part of libsidplayfp, a SID player engine.
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*
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* Copyright 2011-2014 Leandro Nini <drfiemost@users.sourceforge.net>
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* Copyright 2007-2010 Antti Lankila
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* Copyright 2001 Simon White
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef C64CIA_H
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#define C64CIA_H
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// The CIA emulations are very generic and here we need to effectively
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// wire them into the computer (like adding a chip to a PCB).
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#include "Banks/Bank.h"
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#include "c64/c64env.h"
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#include "sidendian.h"
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#include "CIA/mos6526.h"
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#include "sidcxx11.h"
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namespace libsidplayfp
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{
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/**
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* CIA 1
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*
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* Generates IRQs
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*
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* Located at $DC00-$DCFF
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*/
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class c64cia1: public MOS6526, public Bank
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{
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private:
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c64env &m_env;
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uint_least16_t last_ta;
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protected:
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void interrupt(bool state) override
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{
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m_env.interruptIRQ(state);
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}
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void portB() override
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{
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m_env.lightpen((prb | ~ddrb) & 0x10);
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}
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public:
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c64cia1(c64env *env) :
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MOS6526(&(env->context())),
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m_env(*env) {}
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void poke(uint_least16_t address, uint8_t value) override
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{
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write(endian_16lo8(address), value);
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// Save the value written to Timer A
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if (address == 0xDC04 || address == 0xDC05)
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{
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if (timerA.getTimer() != 0)
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last_ta = timerA.getTimer();
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}
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}
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uint8_t peek(uint_least16_t address) override
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{
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return read(endian_16lo8(address));
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}
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void reset() override
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{
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last_ta = 0;
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MOS6526::reset();
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}
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uint_least16_t getTimerA() const { return last_ta; }
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};
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/**
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* CIA 2
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*
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* Generates NMIs
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*
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* Located at $DD00-$DDFF
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*/
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class c64cia2: public MOS6526, public Bank
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{
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private:
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c64env &m_env;
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protected:
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void interrupt(bool state) override
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{
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if (state)
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m_env.interruptNMI();
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}
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public:
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c64cia2(c64env *env) :
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MOS6526(&(env->context())),
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m_env(*env) {}
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void poke(uint_least16_t address, uint8_t value) override
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{
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write(address, value);
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}
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uint8_t peek(uint_least16_t address) override
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{
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return read(address);
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}
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};
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}
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#endif // C64CIA_H
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