libsidplayfp::InterruptSource Class Reference

#include <interrupt.h>

Inheritance diagram for libsidplayfp::InterruptSource:

Collaboration diagram for libsidplayfp::InterruptSource:

Public Types
enum	{   INTERRUPT_NONE = 0 , INTERRUPT_UNDERFLOW_A = 1 << 0 , INTERRUPT_UNDERFLOW_B = 1 << 1 , INTERRUPT_ALARM = 1 << 2 ,   INTERRUPT_SP = 1 << 3 , INTERRUPT_FLAG = 1 << 4 , INTERRUPT_REQUEST = 1 << 7 }

Public Member Functions
virtual void	trigger (uint8_t interruptMask)=0
virtual uint8_t	clear ()
virtual void	reset ()
void	set (uint8_t interruptMask)

Protected Member Functions
bool	interruptTriggered () const
bool	interruptMasked (uint8_t interruptMask) const
virtual void	triggerInterrupt ()=0
bool	ack0 () const
bool	write0 () const
void	interrupt ()
void	updateIdr ()
void	setIrq ()
void	clearIrq ()
	InterruptSource (EventScheduler &scheduler, MOS652X &parent)
void	schedule (int delay)
void	scheduleIrq ()
bool	isTriggered (uint8_t interruptMask)

Protected Attributes
EventScheduler &	eventScheduler
	Event scheduler.
event_clock_t	last_clear = 0
	Clock when clear was called last.
event_clock_t	last_set = 0
uint8_t	icr = 0
	Interrupt control register.
uint8_t	idr = 0
	Interrupt data register.
uint8_t	idrTemp = 0
bool	scheduled = false
	Have we already scheduled CIA->CPU interrupt transition?
bool	asserted = false
	is the irq pin asserted?

Detailed Description

This is the base class for the MOS6526 interrupt sources. Based on Denise emu code.

Member Enumeration Documentation

anonymous enum

anonymous enum

Enumerator
INTERRUPT_NONE	no interrupt
INTERRUPT_UNDERFLOW_A	underflow Timer A
INTERRUPT_UNDERFLOW_B	underflow Timer B
INTERRUPT_ALARM	alarm clock
INTERRUPT_SP	serial port
INTERRUPT_FLAG	external flag
INTERRUPT_REQUEST	control bit

Constructor & Destructor Documentation

InterruptSource()

libsidplayfp::InterruptSource::InterruptSource ( EventScheduler &  scheduler, MOS652X &  parent  )

inlineprotected

Create a new InterruptSource.

Parameters

scheduler	event scheduler
parent	the CIA chip which this Interrupt belongs to

Member Function Documentation

ack0()

bool libsidplayfp::InterruptSource::ack0 ( ) const

inlineprotected

Check if interrupts were ackowledged during previous cycle.

clear()

uint8_t libsidplayfp::InterruptSource::clear ( )

virtual

Clear interrupt state.

Returns

old interrupt state

Reimplemented in libsidplayfp::InterruptSource6526.

interrupt()

void libsidplayfp::InterruptSource::interrupt ( )

protected

Signal interrupt to CPU.

reset()

virtual void libsidplayfp::InterruptSource::reset ( )

inlinevirtual

Clear pending interrupts, but do not signal to CPU we lost them. It is assumed that all components get reset() calls in synchronous manner.

schedule()

void libsidplayfp::InterruptSource::schedule ( int  delay )

inlineprotected

Schedules an IRQ asserting state transition for next cycle.

set()

void libsidplayfp::InterruptSource::set

(

uint8_t

interruptMask

)

Set interrupt control mask bits.

Parameters

interruptMask

control mask bits

trigger()

virtual void libsidplayfp::InterruptSource::trigger ( uint8_t  interruptMask )

pure virtual

Trigger an interrupt.

Parameters

interruptMask

Interrupt flag number

Implemented in libsidplayfp::InterruptSource8521, and libsidplayfp::InterruptSource6526.

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The documentation for this class was generated from the following files:

• interrupt.h
• interrupt.cpp