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2151intf.c
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C/C++ Source or Header
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2000-05-23
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6KB
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324 lines
/***************************************************************************
2151intf.c
Support interface YM2151(OPM)
***************************************************************************/
#include "driver.h"
#include "fm.h"
#include "ym2151.h"
/* for stream system */
static int stream[MAX_2151];
static const struct YM2151interface *intf;
static int FMMode;
#define CHIP_YM2151_DAC 4 /* use Tatsuyuki's FM.C */
#define CHIP_YM2151_ALT 5 /* use Jarek's YM2151.C */
#if (HAS_YM2151)
#define YM2151_NUMBUF 2
static void *Timer[MAX_2151][2];
/* IRQ Handler */
static void IRQHandler(int n,int irq)
{
if(intf->irqhandler[n]) intf->irqhandler[n](irq);
}
static void timer_callback_2151(int param)
{
int n=param&0x7f;
int c=param>>7;
Timer[n][c] = 0;
YM2151TimerOver(n,c);
}
/* TimerHandler from fm.c */
static void TimerHandler(int n,int c,int count,double stepTime)
{
if( count == 0 )
{ /* Reset FM Timer */
if( Timer[n][c] )
{
timer_remove (Timer[n][c]);
Timer[n][c] = 0;
}
}
else
{ /* Start FM Timer */
double timeSec = (double)count * stepTime;
if( Timer[n][c] == 0 )
{
Timer[n][c] = timer_set (timeSec, (c<<7)|n, timer_callback_2151 );
}
}
}
#endif
/* update request from fm.c */
void YM2151UpdateRequest(int chip)
{
stream_update(stream[chip],0);
}
static int my_YM2151_sh_start(const struct MachineSound *msound,int mode)
{
int i,j;
int rate = Machine->sample_rate;
char buf[YM2151_NUMBUF][40];
const char *name[YM2151_NUMBUF];
int mixed_vol,vol[YM2151_NUMBUF];
if( rate == 0 ) rate = 1000; /* kludge to prevent nasty crashes */
intf = msound->sound_interface;
if( mode ) FMMode = CHIP_YM2151_ALT;
else FMMode = CHIP_YM2151_DAC;
switch(FMMode)
{
#if (HAS_YM2151)
case CHIP_YM2151_DAC: /* Tatsuyuki's */
/* stream system initialize */
for (i = 0;i < intf->num;i++)
{
mixed_vol = intf->volume[i];
/* stream setup */
for (j = 0 ; j < YM2151_NUMBUF ; j++)
{
name[j]=buf[j];
vol[j] = mixed_vol & 0xffff;
mixed_vol>>=16;
sprintf(buf[j],"%s #%d Ch%d",sound_name(msound),i,j+1);
}
stream[i] = stream_init_multi(YM2151_NUMBUF,
name,vol,rate,i,OPMUpdateOne);
}
/* Set Timer handler */
for (i = 0; i < intf->num; i++)
Timer[i][0] =Timer[i][1] = 0;
if (OPMInit(intf->num,intf->baseclock,Machine->sample_rate,TimerHandler,IRQHandler) == 0)
{
/* set port handler */
for (i = 0; i < intf->num; i++)
OPMSetPortHander(i,intf->portwritehandler[i]);
return 0;
}
/* error */
return 1;
#endif
#if (HAS_YM2151_ALT)
case CHIP_YM2151_ALT: /* Jarek's */
/* stream system initialize */
for (i = 0;i < intf->num;i++)
{
/* stream setup */
mixed_vol = intf->volume[i];
for (j = 0 ; j < YM2151_NUMBUF ; j++)
{
name[j]=buf[j];
vol[j] = mixed_vol & 0xffff;
mixed_vol>>=16;
sprintf(buf[j],"%s #%d Ch%d",sound_name(msound),i,j+1);
}
stream[i] = stream_init_multi(YM2151_NUMBUF,
name,vol,rate,i,YM2151UpdateOne);
}
if (YM2151Init(intf->num,intf->baseclock,Machine->sample_rate) == 0)
{
for (i = 0; i < intf->num; i++)
{
YM2151SetIrqHandler(i,intf->irqhandler[i]);
YM2151SetPortWriteHandler(i,intf->portwritehandler[i]);
}
return 0;
}
return 1;
#endif
}
return 1;
}
#if (HAS_YM2151)
int YM2151_sh_start(const struct MachineSound *msound)
{
return my_YM2151_sh_start(msound,0);
}
#endif
#if (HAS_YM2151_ALT)
int YM2151_sh_start(const struct MachineSound *msound)
{
return my_YM2151_sh_start(msound,1);
}
#endif
void YM2151_sh_stop(void)
{
switch(FMMode)
{
#if (HAS_YM2151)
case CHIP_YM2151_DAC:
OPMShutdown();
break;
#endif
#if (HAS_YM2151_ALT)
case CHIP_YM2151_ALT:
YM2151Shutdown();
break;
#endif
}
}
void YM2151_sh_reset(void)
{
int i;
for (i = 0;i < intf->num;i++)
switch(FMMode)
{
#if (HAS_YM2151)
case CHIP_YM2151_DAC:
OPMResetChip(i);
break;
#endif
#if (HAS_YM2151_ALT)
case CHIP_YM2151_ALT:
YM2151ResetChip(i);
break;
#endif
}
}
static int lastreg0,lastreg1,lastreg2;
READ_HANDLER( YM2151_status_port_0_r )
{
switch(FMMode)
{
#if (HAS_YM2151)
case CHIP_YM2151_DAC:
return YM2151Read(0,1);
#endif
#if (HAS_YM2151_ALT)
case CHIP_YM2151_ALT:
return YM2151ReadStatus(0);
#endif
}
return 0;
}
READ_HANDLER( YM2151_status_port_1_r )
{
switch(FMMode)
{
#if (HAS_YM2151)
case CHIP_YM2151_DAC:
return YM2151Read(1,1);
#endif
#if (HAS_YM2151_ALT)
case CHIP_YM2151_ALT:
return YM2151ReadStatus(1);
#endif
}
return 0;
}
READ_HANDLER( YM2151_status_port_2_r )
{
switch(FMMode)
{
#if (HAS_YM2151)
case CHIP_YM2151_DAC:
return YM2151Read(2,1);
#endif
#if (HAS_YM2151_ALT)
case CHIP_YM2151_ALT:
return YM2151ReadStatus(2);
#endif
}
return 0;
}
WRITE_HANDLER( YM2151_register_port_0_w )
{
lastreg0 = data;
}
WRITE_HANDLER( YM2151_register_port_1_w )
{
lastreg1 = data;
}
WRITE_HANDLER( YM2151_register_port_2_w )
{
lastreg2 = data;
}
WRITE_HANDLER( YM2151_data_port_0_w )
{
switch(FMMode)
{
#if (HAS_YM2151)
case CHIP_YM2151_DAC:
YM2151Write(0,0,lastreg0);
YM2151Write(0,1,data);
break;
#endif
#if (HAS_YM2151_ALT)
case CHIP_YM2151_ALT:
YM2151UpdateRequest(0);
YM2151WriteReg(0,lastreg0,data);
break;
#endif
}
}
WRITE_HANDLER( YM2151_data_port_1_w )
{
switch(FMMode)
{
#if (HAS_YM2151)
case CHIP_YM2151_DAC:
YM2151Write(1,0,lastreg1);
YM2151Write(1,1,data);
break;
#endif
#if (HAS_YM2151_ALT)
case CHIP_YM2151_ALT:
YM2151UpdateRequest(1);
YM2151WriteReg(1,lastreg1,data);
break;
#endif
}
}
WRITE_HANDLER( YM2151_data_port_2_w )
{
switch(FMMode)
{
#if (HAS_YM2151)
case CHIP_YM2151_DAC:
YM2151Write(2,0,lastreg2);
YM2151Write(2,1,data);
break;
#endif
#if (HAS_YM2151_ALT)
case CHIP_YM2151_ALT:
YM2151UpdateRequest(2);
YM2151WriteReg(2,lastreg2,data);
break;
#endif
}
}