reactos/drivers/multimedia/audio/sound/dsp.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/dd/sound/dsp.c
* PURPOSE: Digital Signal Processing ?
* PROGRAMMER: Snatched from ?
*
* UPDATE HISTORY:
* ??/??/??: Created
* 10/23/02: Steven Edwards (Steven_Ed4153@yahoo.com)
* Minor build fix
*/
#include "sb16.h"
#include "dsp.h"
/************************************
* unsigned char read_dsp(void)
*
* Reads the DSP chip
* Arguments: none
* Returns: Byte read
************************************/
unsigned char read_dsp(unsigned short base)
{
// while((inb(base+0x0e)&0x80)==0); //Wait until there is something to read
// return inb(base+0x0a);
return 0;
}
/************************************'
* sb_status detect_dsp(void);
*
* Detects if a SB16 is installed
* Arguments: None
* Returns: Success or failure
************************************/
sb_status detect_dsp(SB16* sb16)
{
for(base=0x200;base<0x280;base+=0x10) //Tries to reset all DSP addresses there is
if(reset_dsp(base)==SB_TRUE)
{
sb16->base=base;
return SB_TRUE;
}
return SB_FALSE;
}
/**************************************
* sb_status reset_dsp(unsigned short base_address);
*
* Tries to reset a DSP chip
* Arguments: base address
* Returns: Success of failure
**************************************/
sb_status reset_dsp(unsigned short base_address)
{
// int delay;
// outb(base_address+DSP_RESET_PORT,1);
// for(delay=0;delay<0xffff;delay++);
// outb(base_address+DSP_RESET_PORT,0);
// for(delay=0;delay<0xffff;delay++);
// if((inb(base_address+DSP_READ_STATUS_PORT)&0x80)==0) return SB_FALSE;
// if(inb(base_address+DSP_READ_DATA_PORT)!=0xAA) return SB_FALSE;
return SB_TRUE;
}
void write_dsp(unsigned short base,unsigned char data)
{
// while ((inb(base+DSP_WRITE_PORT) & 0x80) != 0);
// outb(base+DSP_WRITE_PORT, data);
}