libsidplayfp::InterruptSource Class Reference

#include <interrupt.h>

Inheritance 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)
virtual uint8_t	clear ()
virtual void	reset ()
void	set (uint8_t interruptMask)
void	event () override

Protected Member Functions
bool	interruptMasked () const
bool	interruptTriggered () const
void	triggerInterrupt ()
bool	ack0 () const
	InterruptSource (EventScheduler &scheduler, MOS652X &parent)
void	schedule ()
void	interrupt (bool state)
	Event (const char *const name)

Protected Attributes
EventScheduler &	eventScheduler
	Event scheduler.
event_clock_t	last_clear
	Clock when clear was called last.
uint8_t	icr
	Interrupt control register.
uint8_t	idr
	Interrupt data register.

Detailed Description

This is the base class for the MOS6526 interrupt sources.

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 MOS6526 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.

event()

void libsidplayfp::InterruptSource::event ( )

overridevirtual

Signal interrupt to CPU.

Implements libsidplayfp::Event.

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.

Reimplemented in libsidplayfp::InterruptSource6526.

schedule()

void libsidplayfp::InterruptSource::schedule ( )

inlineprotected

Schedules an IRQ asserting state transition for next cycle.

set()

void libsidplayfp::InterruptSource::set ( uint8_t  interruptMask )

inline

Set interrupt control mask bits.

Parameters

interruptMask

control mask bits

trigger()

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

inlinevirtual

Trigger an interrupt.

Parameters

interruptMask

Interrupt flag number

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

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

• interrupt.h
• interrupt.cpp