70 lines
1.4 KiB
C++
70 lines
1.4 KiB
C++
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#include "interrupts.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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Interrupts::Interrupts(NesEmulator &emu) :
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m_emu(emu)
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{
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}
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void Interrupts::pollStatus()
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{
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if(!m_emu.cpu().suspendNmi())
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{
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//The edge detector, see ifnmi occurred.
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if(m_ppuNmiCurrent && !m_ppuNmiOld) //Raising edge, set nmi request
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m_emu.cpu().setNmiPin(true);
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m_ppuNmiCurrent = false; //NMI detected or not, low both lines forthis form ___|-|__
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m_ppuNmiOld = false;
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}
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if(!m_emu.cpu().suspendIrq())
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m_emu.cpu().setIrqPin(!m_emu.cpu().flagI() && m_flags); // irq level detector
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m_vector = m_emu.cpu().nmiPin() ? 0xFFFA : 0xFFFE;
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}
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void Interrupts::writeState(QDataStream &dataStream) const
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{
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dataStream << m_flags << m_ppuNmiCurrent << m_ppuNmiOld << m_vector;
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}
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void Interrupts::readState(QDataStream &dataStream)
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{
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dataStream >> m_flags >> m_ppuNmiCurrent >> m_ppuNmiOld >> m_vector;
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}
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qint32 Interrupts::flags() const
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{
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return m_flags;
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}
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void Interrupts::addFlag(IrqFlag flag)
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{
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m_flags |= flag;
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}
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void Interrupts::removeFlag(IrqFlag flag)
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{
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m_flags &= ~flag;
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}
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void Interrupts::setFlags(qint32 flags)
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{
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m_flags = flags;
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}
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quint16 Interrupts::vector() const
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{
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return m_vector;
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}
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void Interrupts::setNmiCurrent(bool nmiCurrent)
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{
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m_ppuNmiCurrent = nmiCurrent;
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}
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