60 lines
1.1 KiB
C++
60 lines
1.1 KiB
C++
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#include "ffe.h"
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// Qt includes
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#include <QDataStream>
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// local includes
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#include "nesemulator.h"
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Ffe::Ffe(NesEmulator &emu, const Rom &rom) :
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Board(emu, rom)
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{
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}
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Ffe::~Ffe()
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{
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}
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void Ffe::writeEx(quint16 address, quint8 value)
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{
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switch (address)
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{
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case 0x4501:
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m_irqEnable = false;
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m_emu.interrupts().removeFlag(Interrupts::IRQ_BOARD);
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break;
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case 0x4502:
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m_irqCounter = (m_irqCounter & 0xFF00) | value;
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break;
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case 0x4503:
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m_irqEnable = true;
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m_irqCounter = (m_irqCounter & 0x00FF) | (value << 8);
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break;
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}
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}
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void Ffe::onCpuClock()
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{
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if (m_irqEnable)
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{
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m_irqCounter++;
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if (m_irqCounter >= 0xFFFF)
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{
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m_irqCounter = 0;
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m_emu.interrupts().addFlag(Interrupts::IRQ_BOARD);
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}
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}
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}
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void Ffe::readState(QDataStream &dataStream)
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{
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Board::readState(dataStream);
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dataStream >> m_irqEnable >> m_irqCounter;
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}
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void Ffe::writeState(QDataStream &dataStream) const
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{
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Board::writeState(dataStream);
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dataStream << m_irqEnable << m_irqCounter;
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}
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