PitCounter Class Reference

A single counter of a PIT. More...

Inheritance diagram for PitCounter:

Public Member Functions
void	read_back (unsigned char value)
void	set_modus (unsigned char modus)
	Set the modus of the counter.
void	set_gate (unsigned char value)
	Manipulate the gate.
bool	get_out ()
unsigned char	read ()
	Read from the counter port.
void	write (unsigned char value)
	Write to the counter port.
bool	receive (MessageIrqNotify &msg)
bool	receive (MessageTimeout &msg)
	PitCounter (DBus< MessageTimer > *bus_timer, DBus< MessageIrqLines > *bus_irq, unsigned irq, Clock *clock)
	PitCounter ()
Public Member Functions inherited from StaticReceiver< PitCounter >
	StaticReceiver ()
Public Member Functions inherited from Device
void	debug_dump ()
	Device (const char *debug_name)

Private Types
enum	Modes { BCD = 0x001, RW_LOW = 0x010, RW_HIGH = 0x020, NULL_COUNT = 0x040 }
enum	Features {   FPERIODIC = 1 << 0, FSOFTWARE_TRIGGER = 1 << 1, FGATE_DISABLE_COUNTING = 1 << 2, FSQUARE_WAVE = 1 << 3,   FCOUNTDOWN = 1 << 4 }

Private Member Functions
bool	feature (Features f)
unsigned short	s2bcd (unsigned short value)
unsigned short	bcd2s (unsigned short value)
void	load_counter ()
void	disable_counting ()
void	update_timer ()
	Rearm a new timeout.
unsigned short	get_counter ()
	Get the current counter value.
void	reload_counter ()

Private Attributes
unsigned short	_modus
unsigned short	_latch
unsigned short	_new_counter
unsigned	_initial
unsigned char	_latched_status
struct {
unsigned char   _read_low: 1
unsigned char   _wrote_low: 1
unsigned char   _stopped: 1
unsigned char   _stopped_out: 1
unsigned char   _gate: 1
unsigned char   _lstatus: 1
unsigned char   _latched: 2
};
timevalue	_start
DBus< MessageTimer > *	_bus_timer
DBus< MessageIrqLines > *	_bus_irq
unsigned	_irq
Clock	_clock
unsigned	_timer

Static Private Attributes
static const long	FREQ = 1193180

Friends
class	PitTest

Additional Inherited Members
Static Public Member Functions inherited from StaticReceiver< PitCounter >
static bool	receive_static (Device *o, M &msg)

Detailed Description

A single counter of a PIT.

State: stable Implementation Note: the access to the _modus variable is not SMP safe. Documentation: Intel 82c54 - intel-82c54-timer.pdf

Member Enumeration Documentation

enum PitCounter::Features

private

Enumerator:

FPERIODIC
FSOFTWARE_TRIGGER
FGATE_DISABLE_COUNTING
FSQUARE_WAVE
FCOUNTDOWN

enum PitCounter::Modes

private

Enumerator:

BCD
RW_LOW
RW_HIGH
NULL_COUNT

Constructor & Destructor Documentation

PitCounter::PitCounter ( DBus< MessageTimer > *  bus_timer, DBus< MessageIrqLines > *  bus_irq, unsigned  irq, Clock *  clock  )

inline

PitCounter::PitCounter ( )

inline

Member Function Documentation

unsigned short PitCounter::bcd2s ( unsigned short  value )

inlineprivate

void PitCounter::disable_counting ( )

inlineprivate

bool PitCounter::feature ( Features  f )

inlineprivate

unsigned short PitCounter::get_counter ( )

inlineprivate

Get the current counter value.

bool PitCounter::get_out ( )

inline

void PitCounter::load_counter ( )

inlineprivate

unsigned char PitCounter::read ( )

inline

Read from the counter port.

void PitCounter::read_back ( unsigned char  value )

inline

bool PitCounter::receive ( MessageIrqNotify &  msg )

inline

bool PitCounter::receive ( MessageTimeout &  msg )

inline

void PitCounter::reload_counter ( )

inlineprivate

unsigned short PitCounter::s2bcd ( unsigned short  value )

inlineprivate

void PitCounter::set_gate ( unsigned char  value )

inline

Manipulate the gate.

void PitCounter::set_modus ( unsigned char  modus )

inline

Set the modus of the counter.

void PitCounter::update_timer ( )

inlineprivate

Rearm a new timeout.

void PitCounter::write ( unsigned char  value )

inline

Write to the counter port.

Friends And Related Function Documentation

friend class PitTest

friend

Member Data Documentation

struct { ... }

DBus<MessageIrqLines>* PitCounter::_bus_irq

private

DBus<MessageTimer>* PitCounter::_bus_timer

private

Clock PitCounter::_clock

private

unsigned char PitCounter::_gate

unsigned PitCounter::_initial

private

unsigned PitCounter::_irq

private

unsigned short PitCounter::_latch

private

unsigned char PitCounter::_latched

unsigned char PitCounter::_latched_status

private

unsigned char PitCounter::_lstatus

unsigned short PitCounter::_modus

private

unsigned short PitCounter::_new_counter

private

unsigned char PitCounter::_read_low

timevalue PitCounter::_start

private

unsigned char PitCounter::_stopped

unsigned char PitCounter::_stopped_out

unsigned PitCounter::_timer

private

unsigned char PitCounter::_wrote_low

const long PitCounter::FREQ = 1193180

staticprivate

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

• vancouver/model/pit8254.cc