card.c

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/*
    Sound card operations
 
    http://www.cae.wisc.edu/~brodskye/sb16doc/sb16doc.html
*/
 
#include <ntddk.h>
#include "sndblst.h"
 
VOID SetOutputSampleRate(ULONG BasePort, ULONG SampleRate)
{
    // This only works for DSP v4.xx ONLY - need a workaround!
    DPRINT("Setting output sample rate\n");
 
    // WAIT
//    if (! WaitToSend(BasePort))
//        return;
 
    SB_WRITE_BYTE(BasePort, SB_SET_OUTPUT_RATE);
    SB_WRITE_BYTE(BasePort, SampleRate / 256);  // high
    SB_WRITE_BYTE(BasePort, SampleRate % 256);  // low
}
 
 
VOID EnableSpeaker(ULONG BasePort, BOOLEAN SpeakerOn)
{
    DPRINT("Setting speaker status %d\n", SpeakerOn);
 
//    if (! WaitForWrite(BasePort))
//        return;
 
    SB_WRITE_BYTE(BasePort, SpeakerOn ? SB_ENABLE_SPEAKER : SB_DISABLE_SPEAKER);
}
 
 
BOOLEAN IsSpeakerEnabled(ULONG BasePort)
{
    DPRINT("Obtaining speaker status\n");
 
//    if (! WaitToSend(BasePort))
//        return FALSE;
 
    SB_WRITE_BYTE(BasePort, SB_GET_SPEAKER_STATUS);
    if (! WaitToReceive(BasePort))
        return FALSE;
 
    return SB_READ_DATA(BasePort) == 0xff;
}
 
 
VOID BeginPlayback(ULONG BasePort, ULONG BitDepth, ULONG Channels, ULONG BlockSize)
{
    DPRINT("BeginPlayback(%d, %d, %d, %d)\n", BasePort, BitDepth, Channels, BlockSize);
 
//    switch(BitDepth)
//    {
//        case 8 :    Command = 0xc0; break;
//        case 16 :   Command = 0xb0; break;  // Make sure we support it
//        default :   Command = 0xc0;
//    }
 
    DPRINT("Initiating playback\n");
 
    // TEMPORARY:
    SB_WRITE_BYTE(BasePort, 0xc6);
    SB_WRITE_BYTE(BasePort, 0); // mode - TEMPORARY
    SB_WRITE_BYTE(BasePort, BlockSize % 256);
    SB_WRITE_BYTE(BasePort, BlockSize / 256);
}