ppi.c File Reference

#include "ntvdm.h"
#include <debug.h>
#include "emulator.h"
#include "ppi.h"
#include "hardware/pit.h"
#include "hardware/sound/speaker.h"
#include "io.h"

Include dependency graph for ppi.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
static BYTE WINAPI	PpiReadPort (USHORT Port)
static VOID WINAPI	Port61hWrite (USHORT Port, BYTE Data)
static VOID WINAPI	Port62hWrite (USHORT Port, BYTE Data)
VOID	PpiInitialize (VOID)

Variables
BYTE	Port61hState = 0x00
static BYTE	Port62hState = 0x00

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 18 of file ppi.c.

Function Documentation

Port61hWrite()

static VOID WINAPI Port61hWrite ( USHORT  Port, BYTE  Data  )

static

Definition at line 46 of file ppi.c.

{
    // BOOLEAN SpeakerStateChange = FALSE;
    BYTE OldPort61hState = Port61hState;
 
    /* Only the four lowest bytes can be written */
    Port61hState = (Port61hState & 0xF0) | (Data & 0x0F);
 
    if ((OldPort61hState ^ Port61hState) & 0x01)
    {
        DPRINT("PIT 2 Gate %s\n", Port61hState & 0x01 ? "on" : "off");
        PitSetGate(2, !!(Port61hState & 0x01));
        // SpeakerStateChange = TRUE;
    }
 
    if ((OldPort61hState ^ Port61hState) & 0x02)
    {
        /* There were some change for the speaker... */
        DPRINT("Speaker %s\n", Port61hState & 0x02 ? "on" : "off");
        // SpeakerStateChange = TRUE;
    }
    // if (SpeakerStateChange) SpeakerChange(Port61hState);
    SpeakerChange(Port61hState);
}

Referenced by PpiInitialize().

Port62hWrite()

static VOID WINAPI Port62hWrite ( USHORT  Port, BYTE  Data  )

static

Definition at line 71 of file ppi.c.

{
    Port62hState = Data;
}

Referenced by PpiInitialize().

PpiInitialize()

VOID PpiInitialize

(

VOID

)

Definition at line 78 of file ppi.c.

{
    /* Register the I/O Ports */
    // Port 0x60 is now used by the PS/2 controller
    RegisterIoPort(PPI_PORT_61H, PpiReadPort, Port61hWrite);
    RegisterIoPort(PPI_PORT_62H, PpiReadPort, Port62hWrite);
    // Port 0x63 is unused
}

Referenced by EmulatorInitialize().

PpiReadPort()

static BYTE WINAPI PpiReadPort ( USHORT  Port )

static

Definition at line 36 of file ppi.c.

{
    if (Port == PPI_PORT_61H)
        return Port61hState;
    else if (Port == PPI_PORT_62H)
        return Port62hState;
 
    return 0x00;
}

Referenced by PpiInitialize().

Variable Documentation

Port61hState

BYTE Port61hState = 0x00

Definition at line 31 of file ppi.c.

Referenced by PitChan1Out(), PitChan2Out(), Port61hWrite(), and PpiReadPort().

Port62hState

BYTE Port62hState = 0x00

static

Definition at line 32 of file ppi.c.

Referenced by Port62hWrite(), and PpiReadPort().