87 lines
1.7 KiB
C++
87 lines
1.7 KiB
C++
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// Meteor - A Nintendo Gameboy Advance emulator
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// Copyright (C) 2009-2011 Philippe Daouadi
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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 3 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, see <http://www.gnu.org/licenses/>.
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#ifndef __TIMER_H__
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#define __TIMER_H__
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#include "clock.hpp"
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#include <stdint.h>
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#include <istream>
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#include <ostream>
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namespace AMeteor
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{
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class Timer
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{
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public :
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Timer (int8_t num, Timer* next) :
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m_num(num),
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m_reload(0),
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m_count(0),
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m_control(0),
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m_next(next)
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{
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}
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void Reset ();
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void SetReload (uint16_t rel)
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{
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m_reload = rel;
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}
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void Reload ();
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uint16_t GetCount () const;
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bool SaveState (std::ostream& stream);
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bool LoadState (std::istream& stream);
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private :
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union Control
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{
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Control(uint16_t v) :
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w(v)
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{ }
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uint16_t w;
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struct
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{
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unsigned int prescaler : 2;
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bool countup : 1;
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unsigned int unused1 : 3;
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bool irq : 1;
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bool start : 1;
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unsigned int unused2 : 8;
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} b;
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};
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const int8_t m_num;
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uint16_t m_reload;
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uint32_t m_count;
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Control m_control;
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Timer* m_next;
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void TimeEvent ();
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void Countup ();
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friend void Clock::Commit();
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};
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}
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#endif
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