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

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.

Member Function Documentation

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.

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

• device/ticker.h
• device/ticker.cc