pit.h File Reference

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Classes
struct	_PIT_CHANNEL

Macros
#define	PIT_CHANNELS   3
#define	PIT_BASE_FREQUENCY   1193182LL
#define	PIT_DATA_PORT(x)   (0x40 + (x))
#define	PIT_COMMAND_PORT   0x43
#define	WRITE_PIT_VALUE(PitChannel, Value)    (PitChannel).Bcd ? BCD_TO_BINARY(Value) : (Value)
#define	READ_PIT_VALUE(PitChannel, Value)    (PitChannel).Bcd ? BINARY_TO_BCD(Value) : (Value)

Typedefs
typedef enum _PIT_MODE	PIT_MODE
typedef enum _PIT_MODE *	PPIT_MODE
typedef VOID(WINAPI *	PIT_OUT_FUNCTION) (LPVOID Param, BOOLEAN State)
typedef struct _PIT_CHANNEL	PIT_CHANNEL
typedef struct _PIT_CHANNEL *	PPIT_CHANNEL

Enumerations
enum	_PIT_MODE {   PIT_MODE_INT_ON_TERMINAL_COUNT , PIT_MODE_HARDWARE_ONE_SHOT , PIT_MODE_RATE_GENERATOR , PIT_MODE_SQUARE_WAVE ,   PIT_MODE_SOFTWARE_STROBE , PIT_MODE_HARDWARE_STROBE }

Functions
VOID	PitSetOutFunction (BYTE Channel, LPVOID Param, PIT_OUT_FUNCTION OutFunction)
VOID	PitSetGate (BYTE Channel, BOOLEAN State)
WORD	PitGetReloadValue (BYTE Channel)
VOID	PitInitialize (VOID)

Macro Definition Documentation

PIT_BASE_FREQUENCY

#define PIT_BASE_FREQUENCY   1193182LL

Definition at line 17 of file pit.h.

PIT_CHANNELS

#define PIT_CHANNELS   3

Definition at line 16 of file pit.h.

PIT_COMMAND_PORT

#define PIT_COMMAND_PORT   0x43

Definition at line 19 of file pit.h.

PIT_DATA_PORT

#define PIT_DATA_PORT

(

x

)

(0x40 + (x))

Definition at line 18 of file pit.h.

READ_PIT_VALUE

#define READ_PIT_VALUE	(		PitChannel,
			Value
	)		(PitChannel).Bcd ? BINARY_TO_BCD(Value) : (Value)

Definition at line 24 of file pit.h.

WRITE_PIT_VALUE

#define WRITE_PIT_VALUE	(		PitChannel,
			Value
	)		(PitChannel).Bcd ? BCD_TO_BINARY(Value) : (Value)

Definition at line 21 of file pit.h.

Typedef Documentation

PIT_CHANNEL

typedef struct _PIT_CHANNEL PIT_CHANNEL

PIT_MODE

typedef enum _PIT_MODE PIT_MODE

PIT_OUT_FUNCTION

typedef VOID(WINAPI * PIT_OUT_FUNCTION) (LPVOID Param, BOOLEAN State)

Definition at line 37 of file pit.h.

PPIT_CHANNEL

typedef struct _PIT_CHANNEL * PPIT_CHANNEL

PPIT_MODE

typedef enum _PIT_MODE * PPIT_MODE

Enumeration Type Documentation

_PIT_MODE

enum _PIT_MODE

Enumerator
PIT_MODE_INT_ON_TERMINAL_COUNT
PIT_MODE_HARDWARE_ONE_SHOT
PIT_MODE_RATE_GENERATOR
PIT_MODE_SQUARE_WAVE
PIT_MODE_SOFTWARE_STROBE
PIT_MODE_HARDWARE_STROBE

Definition at line 27 of file pit.h.

{
    PIT_MODE_INT_ON_TERMINAL_COUNT,
    PIT_MODE_HARDWARE_ONE_SHOT,
    PIT_MODE_RATE_GENERATOR,
    PIT_MODE_SQUARE_WAVE,
    PIT_MODE_SOFTWARE_STROBE,
    PIT_MODE_HARDWARE_STROBE
} PIT_MODE, *PPIT_MODE;

Function Documentation

PitGetReloadValue()

WORD PitGetReloadValue

(

BYTE

Channel

)

Definition at line 493 of file pit.c.

{
    if (Channel >= PIT_CHANNELS) return 0xFFFF;
 
    if (PitChannels[Channel].ReloadValue == 0)
        return 0xFFFF;
    else
        return PitChannels[Channel].ReloadValue;
}

Referenced by SpeakerChange().

PitInitialize()

VOID PitInitialize

(

VOID

)

Definition at line 503 of file pit.c.

{
    /* Set up the timers to their default value */
    PitSetOutFunction(0, NULL, NULL);
    PitSetGate(0, TRUE);
    PitSetOutFunction(1, NULL, NULL);
    PitSetGate(1, TRUE);
    PitSetOutFunction(2, NULL, NULL);
    PitSetGate(2, FALSE);
 
    /* Register the I/O Ports */
    RegisterIoPort(PIT_COMMAND_PORT,        NULL, PitWritePort);
    RegisterIoPort(PIT_DATA_PORT(0), PitReadPort, PitWritePort);
    RegisterIoPort(PIT_DATA_PORT(1), PitReadPort, PitWritePort);
    RegisterIoPort(PIT_DATA_PORT(2), PitReadPort, PitWritePort);
 
    /* Register the hardware timer */
    MasterClock = CreateHardwareTimer(HARDWARE_TIMER_ENABLED | HARDWARE_TIMER_PRECISE,
                                      HZ_TO_NS(PIT_BASE_FREQUENCY),
                                      PitClock);
}

Referenced by EmulatorInitialize().

PitSetGate()

VOID PitSetGate	(	BYTE	Channel,
		BOOLEAN	State
	)

Definition at line 484 of file pit.c.

{
    if (Channel >= PIT_CHANNELS) return;
    if (State == PitChannels[Channel].Gate) return;
 
    /* UNIMPLEMENTED */
    PitChannels[Channel].Gate = State;
}

Referenced by PitInitialize(), and Port61hWrite().

PitSetOutFunction()

VOID PitSetOutFunction	(	BYTE	Channel,
		LPVOID	Param,
		PIT_OUT_FUNCTION	OutFunction
	)

Definition at line 476 of file pit.c.

{
    if (Channel >= PIT_CHANNELS) return;
 
    PitChannels[Channel].OutParam    = Param;
    PitChannels[Channel].OutFunction = OutFunction;
}

Referenced by EmulatorInitialize(), and PitInitialize().