62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
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/*
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Copyright (C) 2024 iEle <melephas@gmail.com>
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Copyright (C) 2024 retroelec <retroelec42@gmail.com>
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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For the complete text of the GNU General Public License see
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http://www.gnu.org/licenses/.
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*/
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#pragma once
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#include <atomic>
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#include <cstdint>
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// register dc0d:
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// - Interrupt Control Register when written to
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// - is an Interrupt Latch Register when read from
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// - read the clear-on-read register $dc0d will ACK all pending CIA 1 interrupts
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class CIA
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{
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public:
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uint8_t ciareg[0x10];
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bool underflowTimerA;
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uint8_t serbitnr;
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uint8_t serbitnrnext;
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uint8_t latchdc04;
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uint8_t latchdc05;
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uint8_t latchdc06;
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uint8_t latchdc07;
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uint8_t latchdc0d; // read latch register
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uint16_t timerA;
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uint16_t timerB;
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std::atomic<bool> isTODRunning;
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bool isTODFreezed;
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std::atomic<bool> isAlarm;
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std::atomic<uint8_t> latchrundc08; // TOD running
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std::atomic<uint8_t> latchrundc09;
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std::atomic<uint8_t> latchrundc0a;
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std::atomic<uint8_t> latchrundc0b;
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std::atomic<uint8_t> latchalarmdc08; // set alarm
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std::atomic<uint8_t> latchalarmdc09;
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std::atomic<uint8_t> latchalarmdc0a;
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std::atomic<uint8_t> latchalarmdc0b;
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CIA(bool isCIA1);
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void init(bool isCIA1);
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bool checkAlarm();
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bool checkTimerA(uint8_t deltaT);
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bool checkTimerB(uint8_t deltaT);
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};
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