C++ Crashkurs

Public Member Functions | List of all members
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

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
usDesired interrupt interval in microseconds.
Returns
Indicates if the interval could be set.
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.

void Ticker::epilogue ( )
overridevirtual

Epilogue of timer interrupts.

Increases and displays the counter value (uptime)

Reimplemented from Gate.

uint64_t Ticker::interval ( ) const
inline

Retrieve the interrupt interval.

Returns
Interval in microseconds
void Ticker::activate ( )
inline

Activate the timer.

void Ticker::stop ( )
inline

Stop the timer.

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