control.c File Reference

#include <sndblst.h>

Include dependency graph for control.c:

Go to the source code of this file.

Functions
BOOLEAN	WaitForReady (PSOUND_BLASTER_PARAMETERS SBDevice, UCHAR Port)
BOOLEAN	SbWriteData (PSOUND_BLASTER_PARAMETERS SBDevice, UCHAR Data)
BOOLEAN	SbReadData (PSOUND_BLASTER_PARAMETERS SBDevice, PUCHAR Data)
BOOLEAN	ResetSoundBlaster (PSOUND_BLASTER_PARAMETERS SBDevice)
ULONG	GetSoundBlasterModel (PSOUND_BLASTER_PARAMETERS SBDevice)
BOOLEAN	IsSampleRateCompatible (PSOUND_BLASTER_PARAMETERS SBDevice, ULONG SampleRate)
BOOLEAN	SetOutputSampleRate (PSOUND_BLASTER_PARAMETERS SBDevice, ULONG SampleRate)
BOOLEAN	EnableSpeaker (PSOUND_BLASTER_PARAMETERS SBDevice)
BOOLEAN	DisableSpeaker (PSOUND_BLASTER_PARAMETERS SBDevice)
BOOLEAN	StartSoundOutput (PSOUND_BLASTER_PARAMETERS SBDevice, ULONG BitDepth, ULONG Channels, ULONG BlockSize)

Function Documentation

DisableSpeaker()

BOOLEAN DisableSpeaker

(

PSOUND_BLASTER_PARAMETERS

SBDevice

)

Definition at line 167 of file control.c.

{
    DPRINT("Disabling speaker\n");
 
    return SbWriteData(SBDevice, SbDisableSpeaker);
}

EnableSpeaker()

BOOLEAN EnableSpeaker

(

PSOUND_BLASTER_PARAMETERS

SBDevice

)

Definition at line 158 of file control.c.

{
    DPRINT("Enabling speaker\n");
 
    return SbWriteData(SBDevice, SbEnableSpeaker);
}

Referenced by CreateSoundBlaster(), and InitDevice().

GetSoundBlasterModel()

ULONG GetSoundBlasterModel

(

PSOUND_BLASTER_PARAMETERS

SBDevice

)

Definition at line 95 of file control.c.

{
    UCHAR MajorVer, MinorVer;
 
    DPRINT("Querying DSP version\n");
 
    if ( ! SbWriteData(SBDevice, SbGetDspVersion) )
        return NotDetected;
 
    if ( ! WaitToRead(SBDevice) )
        return NotDetected;
 
    if ( SbReadData(SBDevice, &MajorVer) )
    {
        if ( SbReadData(SBDevice, &MinorVer) )
        {
            DPRINT("Version %d.%d\n", MajorVer, MinorVer);
 
            SBDevice->dsp_version = (MajorVer * 256) + MinorVer;
 
            if ( SBDevice->dsp_version < 0x0200 )
                return SoundBlaster;
            else if ( ( SBDevice->dsp_version & 0xFF00 ) == 0x0200 )
                return SoundBlaster2;
            else if ( ( SBDevice->dsp_version & 0xFF00 ) == 0x0300 )
                return SoundBlasterPro;
            else if ( SBDevice->dsp_version >= 0x0400 )
                return SoundBlaster16;
 
            return NotDetected;
        }
    }
 
    return NotDetected;
}

IsSampleRateCompatible()

BOOLEAN IsSampleRateCompatible	(	PSOUND_BLASTER_PARAMETERS	SBDevice,
		ULONG	SampleRate
	)

Definition at line 134 of file control.c.

{
    /* TODO */
    return TRUE;
}

ResetSoundBlaster()

BOOLEAN ResetSoundBlaster

(

PSOUND_BLASTER_PARAMETERS

SBDevice

)

Definition at line 59 of file control.c.

{
    BOOLEAN acked = FALSE;
    ULONG timeout;
 
    SbWriteReset(SBDevice, 0x01);
    for (timeout = 0; timeout < 30000; timeout ++ );
    SbWriteReset(SBDevice, 0x00);
 
    DPRINT("Waiting for SB to acknowledge our reset request\n");
 
    if ( ! WaitToRead(SBDevice) )
    {
        DPRINT("Didn't get an ACK :(\n");
        return FALSE;
    }
 
    timeout = 0;
 
    while ( ( ! acked ) && ( timeout < SB_TIMEOUT ) )
    {
        acked = ( SbReadDataWithoutWait(SBDevice) == SB_DSP_READY );
        timeout ++;
    }
 
    if ( ! acked )
    {
        DPRINT("Didn't get an ACK :(\n");
        return FALSE;
    }
 
    return TRUE;
}

Referenced by InitializeSoundBlaster().

SbReadData()

BOOLEAN SbReadData	(	PSOUND_BLASTER_PARAMETERS	SBDevice,
		PUCHAR	Data
	)

Definition at line 45 of file control.c.

{
    if ( ! WaitToWrite(SBDevice) )
        return FALSE;
 
    *Data = SbRead(SBDevice, SB_READ_DATA_PORT);
    DPRINT("Read 0x%x from Sound Blaster card (data)\n", *Data);
 
    return TRUE;
}

Referenced by GetSoundBlasterModel().

SbWriteData()

BOOLEAN SbWriteData	(	PSOUND_BLASTER_PARAMETERS	SBDevice,
		UCHAR	Data
	)

Definition at line 31 of file control.c.

{
    if ( ! WaitToWrite(SBDevice) )
        return FALSE;
 
    DPRINT("Writing 0x%x to Sound Blaster card (data)\n", Data);
    SbWrite(SBDevice, SB_WRITE_DATA_PORT, Data);
 
    return TRUE;
}

Referenced by DisableSpeaker(), EnableSpeaker(), GetSoundBlasterModel(), SetOutputSampleRate(), and StartSoundOutput().

SetOutputSampleRate()

BOOLEAN SetOutputSampleRate	(	PSOUND_BLASTER_PARAMETERS	SBDevice,
		ULONG	SampleRate
	)

Definition at line 143 of file control.c.

{
    /* Only works for DSP v4.xx */
    DPRINT("Setting sample rate\n");
 
    SbWriteData(SBDevice, SbSetOutputRate);
    SbWriteData(SBDevice, SampleRate / 256);
    SbWriteData(SBDevice, SampleRate % 256);
 
    return TRUE;
}

Referenced by InitDevice().

StartSoundOutput()

BOOLEAN StartSoundOutput	(	PSOUND_BLASTER_PARAMETERS	SBDevice,
		ULONG	BitDepth,
		ULONG	Channels,
		ULONG	BlockSize
	)

Definition at line 176 of file control.c.

{
    DPRINT("Initializing output with %d channels at %d bits/sample\n", Channels, BitDepth);
 
    UCHAR command = 0xc6, mode = 0x00;
 
    if ( ( Channels < 1 ) || ( Channels > 2 ) )
        return FALSE;
 
    if ( ( BitDepth != 8 ) && ( BitDepth != 16 ) )
        return FALSE;
 
    switch ( BitDepth )
    {
        case 8 :    command = 0xc6; break;
        case 16 :   command = 0xb6; break;
    };
 
    switch ( Channels )
    {
        case 1 :    mode = 0x00; break;
        case 2 :    mode = 0x20; break;
    }
#if 0
    first_byte = (BitDepth == 16) ? 0xb6 : 0xc6;
    second_byte = (Channels == 1) ? 0x20 : 0x00;
#endif
 
    if ( SBDevice->dsp_version < 0x0400 )
    {
        /* TODO: Additional programming required */
    }
 
    /* Send freq */
    SbWriteData(SBDevice, command);
    SbWriteData(SBDevice, mode);
    SbWriteData(SBDevice, BlockSize % 256);
    SbWriteData(SBDevice, BlockSize / 256);
 
    DPRINT("Finished programming the DSP\n");
 
    return TRUE;
}

WaitForReady()

BOOLEAN WaitForReady	(	PSOUND_BLASTER_PARAMETERS	SBDevice,
		UCHAR	Port
	)

Definition at line 12 of file control.c.

{
    ULONG timeout = SB_TIMEOUT;
    BOOL ready = FALSE;
 
    while ( ( ! ready ) && ( timeout > 0 ) )
    {
        if ( SbRead(SBDevice, Port) & 0x80 )
            return TRUE;
 
        timeout --;
    }
 
    return FALSE;
}