Ticker Class Reference

The Ticker device demonstrates HPET interrupts. More...

#include <device/ticker.h>

Inheritance diagram for Ticker:

Collaboration diagram for Ticker:

Public Member Functions
	Ticker ()
bool	windup (uint64_t us)
	Windup / initialize.
bool	prologue () override
	Prologue of timer interrupts.
void	epilogue () override
	Epilogue of timer interrupts.
uint64_t	interval () const
	Retrieve the interrupt interval.
void	activate ()
	Activate the timer.
void	stop ()
	Stop the timer.
Public Member Functions inherited from Gate
	Gate ()
	Constructor.
virtual	~Gate ()
	Destructor.
bool	is_queued () const
	Status about the epilogue.
void	set_queued (bool val)
	Set epilogue status.

Private Member Functions
	Ticker (const Ticker &)=delete
Ticker &	operator= (const Ticker &)=delete

Private Attributes
uint64_t	counter
uint64_t	usecs
HPET::Comparator *	comparator

Additional Inherited Members
Protected Member Functions inherited from Queue< T, ContainerType >::Node
	Node ()

Detailed Description

The Ticker device demonstrates HPET interrupts.

Periodic HPET interrupts increase the counter, which is displayed on a designated spot on the screen and shows the current systems runtime.

Constructor & Destructor Documentation

Ticker() [1/2]

Ticker::Ticker ( const Ticker &  )

privatedelete

Ticker() [2/2]

Ticker::Ticker ( )

inline

Member Function Documentation

operator=()

Ticker & Ticker::operator= ( const Ticker &  )

privatedelete

windup()

bool Ticker::windup

(

uint64_t

us

)

Windup / initialize.

Assigns itself to the Plugbox and initializes a HPET::Comparator in such a way that regular interrupts are triggered approx. every us microseconds when Ticker::activate() is called.

Note

This method must find a comparator capable of periodic interrupts.

For IOAPIC::config use Trigger Mode `LEVEL` with Polarity `LOW` to ensure operation on both Qemu/KVM and our test hardware.

Parameters

us	Desired interrupt interval in microseconds.

Returns

Indicates if the interval could be set.

prologue()

bool Ticker::prologue ( )

overridevirtual

Prologue of timer interrupts.

Returns

true if the interrupt was issued by the HPET and Ticker::epilogue should be executed.

Implements Gate.

epilogue()

void Ticker::epilogue ( )

overridevirtual

Epilogue of timer interrupts.

Increases and displays the counter value (uptime)

Reimplemented from Gate.

interval()

uint64_t Ticker::interval ( ) const

inline

Retrieve the interrupt interval.

Returns

Interval in microseconds

activate()

void Ticker::activate ( )

inline

Activate the timer.

stop()

void Ticker::stop ( )

inline

Stop the timer.

Member Data Documentation

counter

uint64_t Ticker::counter

private

usecs

uint64_t Ticker::usecs

private

comparator

HPET::Comparator* Ticker::comparator

private

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

• device/ticker.h
• device/ticker.cc