[wrap]
/***************************************************************************
polepos.c
Sound handler
****************************************************************************/
#include "driver.h"
#include "streams.h"
#include "sound/filter.h"
#include "machine/rescap.h"
#include "sound/custom.h"
#include "namco54.h"
#include "polepos.h"
static int sample_msb = 0;
static int sample_lsb = 0;
static int sample_enable = 0;
static sound_stream *stream;
#define OUTPUT_RATE 24000
#define POLEPOS_R166 1000.0
#define POLEPOS_R167 2200.0
#define POLEPOS_R168 4700.0
/* resistor values when shorted by 4066 running at 5V */
#define POLEPOS_R166_SHUNT 1.0/(1.0/POLEPOS_R166 + 1.0/250)
#define POLEPOS_R167_SHUNT 1.0/(1.0/POLEPOS_R166 + 1.0/250)
#define POLEPOS_R168_SHUNT 1.0/(1.0/POLEPOS_R166 + 1.0/250)
static const double volume_table[8] =
{
(POLEPOS_R168_SHUNT + POLEPOS_R167_SHUNT + POLEPOS_R166_SHUNT + 2200) / 10000,
(POLEPOS_R168_SHUNT + POLEPOS_R167_SHUNT + POLEPOS_R166 + 2200) / 10000,
(POLEPOS_R168_SHUNT + POLEPOS_R167 + POLEPOS_R166_SHUNT + 2200) / 10000,
(POLEPOS_R168_SHUNT + POLEPOS_R167 + POLEPOS_R166 + 2200) / 10000,
(POLEPOS_R168 + POLEPOS_R167_SHUNT + POLEPOS_R166_SHUNT + 2200) / 10000,
(POLEPOS_R168 + POLEPOS_R167_SHUNT + POLEPOS_R166 + 2200) / 10000,
(POLEPOS_R168 + POLEPOS_R167 + POLEPOS_R166_SHUNT + 2200) / 10000,
(POLEPOS_R168 + POLEPOS_R167 + POLEPOS_R166 + 2200) / 10000
};
static filter2_context filter_engine[3];
static const double r_filt_out[3] = {RES_K(4.7), RES_K(7.5), RES_K(10)};
static const double r_filt_total = 1.0 / (1.0/RES_K(4.7) + 1.0/RES_K(7.5) + 1.0/RES_K(10));
/************************************/
/* Stream updater */
/************************************/
static STREAM_UPDATE( engine_sound_update )
{
static UINT32 current_position;
UINT32 step, clock, slot;
UINT8 *base;
double volume, i_total;
stream_sample_t *buffer = outputs[0];
int loop;
/* if we're not enabled, just fill with 0 */
if (!sample_enable)
{
memset(buffer, 0, samples * sizeof(*buffer));
return;
}
/* determine the effective clock rate */
clock = (cpu_get_clock(device->machine->cpu[0]) / 16) * ((sample_msb + 1) * 64 + sample_lsb + 1) / (64*64);
step = (clock << 12) / OUTPUT_RATE;
/* determine the volume */
slot = (sample_msb >> 3) & 7;
volume = volume_table[slot];
base = &memory_region(device->machine, "engine")[slot * 0x800];
/* fill in the sample */
while (samples--)
{
filter_engine[0].x0 = (3.4 / 255 * base[(current_position >> 12) & 0x7ff] - 2) * volume;
filter_engine[1].x0 = filter_engine[0].x0;
filter_engine[2].x0 = filter_engine[0].x0;
i_total = 0;
for (loop = 0; loop < 3; loop++)
{
filter2_step(&filter_engine[loop]);
/* The op-amp powered @ 5V will clip to 0V & 3.5V.
* Adjusted to vRef of 2V, we will clip as follows: */
if (filter_engine[loop].y0 > 1.5) filter_engine[loop].y0 = 1.5;
if (filter_engine[loop].y0 < -2) filter_engine[loop].y0 = -2;
i_total += filter_engine[loop].y0 / r_filt_out[loop];
}
i_total *= r_filt_total * 32000/2; /* now contains voltage adjusted by final gain */
*buffer++ = (int)i_total;
current_position += step;
}
}
/************************************/
/* Sound handler start */
/************************************/
CUSTOM_START( polepos_sh_start )
{
stream = stream_create(device, 0, 1, OUTPUT_RATE, NULL, engine_sound_update);
sample_msb = sample_lsb = 0;
sample_enable = 0;
/* setup the filters */
filter_opamp_m_bandpass_setup(device, RES_K(220), RES_K(33), RES_K(390), CAP_U(.01), CAP_U(.01),
&filter_engine[0]);
filter_opamp_m_bandpass_setup(device, RES_K(150), RES_K(22), RES_K(330), CAP_U(.0047), CAP_U(.0047),
&filter_engine[1]);
/* Filter 3 is a little different. Because of the input capacitor, it is
* a high pass filter. */
filter2_setup(device, FILTER_HIGHPASS, 950, Q_TO_DAMP(.707), 1,
&filter_engine[2]);
return auto_malloc(1);
}
/************************************/
/* Sound handler reset */
/************************************/
CUSTOM_RESET( polepos_sh_reset )
{
int loop;
for (loop = 0; loop < 3; loop++) filter2_reset(&filter_engine[loop]);
}
/************************************/
/* Write LSB of engine sound */
/************************************/
WRITE8_HANDLER( polepos_engine_sound_lsb_w )
{
/* Update stream first so all samples at old frequency are updated. */
stream_update(stream);
sample_lsb = data & 62;
sample_enable = data & 1;
}
/************************************/
/* Write MSB of engine sound */
/************************************/
WRITE8_HANDLER( polepos_engine_sound_msb_w )
{
stream_update(stream);
sample_msb = data & 63;
}
/*************************************
*
* Pole Position
*
* Discrete sound emulation: Feb 2007, D.R.
*
*************************************/
/* nodes - sounds */
#define POLEPOS_CHANL1_SND NODE_11
#define POLEPOS_CHANL2_SND NODE_12
#define POLEPOS_CHANL3_SND NODE_13
#define POLEPOS_CHANL4_SND NODE_14
#define POLEPOS_54XX_DAC_R (1.0 / (1.0 / RES_K(47) + 1.0 / RES_K(22) + 1.0 / RES_K(10) + 1.0 / RES_K(4.7)))
static const discrete_dac_r1_ladder polepos_54xx_dac =
{
4, /* number of DAC bits */
/* 54XX_0 54XX_1 54XX_2 */
{ RES_K(47), /* R124, R136, R152 */
RES_K(22), /* R120, R132, R142 */
RES_K(10), /* R119, R131, R138 */
RES_K(4.7)}, /* R118, R126, R103 */
0, 0, 0, 0 /* nothing extra */
};
#define POLEPOS_52XX_DAC_R (1.0 / (1.0 / RES_K(100) + 1.0 / RES_K(47) + 1.0 / RES_K(22) + 1.0 / RES_K(10)))
static const discrete_dac_r1_ladder polepos_52xx_dac =
{
4, /* number of DAC bits */
{ RES_K(100), /* R160 */
RES_K(47), /* R159 */
RES_K(22), /* R155 */
RES_K(10)}, /* R154 */
0, 0, 0, 0 /* nothing extra */
};
/* R117 R116 R117 */
#define POLEPOS_VREF (5.0 * (RES_K(1) / (RES_K(1.5) + RES_K(1))))
static const discrete_op_amp_filt_info polepos_chanl1_filt =
{
POLEPOS_54XX_DAC_R + RES_K(22), /* R121 */
0, /* no second input */
RES_K(12), /* R125 */
0, /* not used */
RES_K(120), /* R122 */
CAP_U(0.0022), /* C27 */
CAP_U(0.0022), /* C28 */
0, /* not used */
POLEPOS_VREF, /* vRef */
5, /* vP */
0 /* vN */
};
static const discrete_op_amp_filt_info polepos_chanl2_filt =
{
POLEPOS_54XX_DAC_R + RES_K(15), /* R133 */
0, /* no second input */
RES_K(15), /* R137 */
0, /* not used */
RES_K(120), /* R134 */
CAP_U(0.022), /* C29 */
CAP_U(0.022), /* C30 */
0, /* not used */
POLEPOS_VREF, /* vRef */
5, /* vP */
0 /* vN */
};
static const discrete_op_amp_filt_info polepos_chanl3_filt =
{
POLEPOS_54XX_DAC_R + RES_K(22), /* R139 */
0, /* no second input */
RES_K(22), /* R143 */
0, /* not used */
RES_K(180), /* R140 */
CAP_U(0.047), /* C33 */
CAP_U(0.047), /* C34 */
0, /* not used */
POLEPOS_VREF, /* vRef */
5, /* vP */
0 /* vN */
};
DISCRETE_SOUND_START(polepos)
/************************************************
* Input register mapping
************************************************/
DISCRETE_INPUT_DATA(NAMCO_54XX_0_DATA)
DISCRETE_INPUT_DATA(NAMCO_54XX_1_DATA)
DISCRETE_INPUT_DATA(NAMCO_54XX_2_DATA)
DISCRETE_INPUT_DATA(NAMCO_52XX_P_DATA)
/************************************************
* CHANL1 sound
************************************************/
DISCRETE_DAC_R1(NODE_20,
1, /* ENAB */
NAMCO_54XX_2_DATA,
4, /* 4V - unmeasured*/
&polepos_54xx_dac)
DISCRETE_OP_AMP_FILTER(NODE_21,
1, /* ENAB */
NODE_20, /* INP0 */
0, /* INP1 - not used */
DISC_OP_AMP_FILTER_IS_BAND_PASS_1M, &polepos_chanl1_filt)
/* fake it so 0 is now vRef */
DISCRETE_ADDER2(POLEPOS_CHANL1_SND,
1, /* ENAB */
NODE_21, -POLEPOS_VREF)
/************************************************
* CHANL2 sound
************************************************/
DISCRETE_DAC_R1(NODE_30,
1, /* ENAB */
NAMCO_54XX_1_DATA,
4, /* 4V - unmeasured*/
&polepos_54xx_dac)
DISCRETE_OP_AMP_FILTER(NODE_31,
1, /* ENAB */
NODE_30, /* INP0 */
0, /* INP1 - not used */
DISC_OP_AMP_FILTER_IS_BAND_PASS_1M, &polepos_chanl2_filt)
/* fake it so 0 is now vRef */
DISCRETE_ADDER2(POLEPOS_CHANL2_SND,
1, /* ENAB */
NODE_31, -POLEPOS_VREF)
/************************************************
* CHANL3 sound
************************************************/
DISCRETE_DAC_R1(NODE_40,
1, /* ENAB */
NAMCO_54XX_0_DATA,
4, /* 4V - unmeasured*/
&polepos_54xx_dac)
DISCRETE_OP_AMP_FILTER(NODE_41,
1, /* ENAB */
NODE_40, /* INP0 */
0, /* INP1 - not used */
DISC_OP_AMP_FILTER_IS_BAND_PASS_1M, &polepos_chanl3_filt)
/* fake it so 0 is now vRef */
DISCRETE_ADDER2(POLEPOS_CHANL3_SND,
1, /* ENAB */
NODE_41, -POLEPOS_VREF)
/************************************************
* CHANL4 sound
************************************************/
/* disabled until 52XX is emulated */
/* this circuit was simulated in SPICE and an equivalent filter circuit generated */
DISCRETE_DAC_R1(NODE_50,
0, /* ENAB */
NAMCO_52XX_P_DATA,
4, /* 4V - unmeasured*/
&polepos_52xx_dac)
/* fake it so 0 is now vRef */
DISCRETE_ADDER2(NODE_51,
0, /* ENAB */
NODE_50, -POLEPOS_VREF)
DISCRETE_FILTER2(NODE_52,
0, /* ENAB */
NODE_51, /* INP0 */
100, /* FREQ */
1.0 / 0.3, /* DAMP */
DISC_FILTER_HIGHPASS)
DISCRETE_FILTER2(NODE_53,
0, /* ENAB */
NODE_52, /* INP0 */
1200, /* FREQ */
1.0 / 0.8, /* DAMP */
DISC_FILTER_LOWPASS)
DISCRETE_GAIN(NODE_54,
NODE_53, /* IN0 */
0.5 /* overall filter GAIN */)
/* clamp to the maximum of the op-amp shifted by vRef */
DISCRETE_CLAMP(POLEPOS_CHANL4_SND,
0, /* ENAB */
NODE_54, /* IN0 */
0, /* MIN */
5.0 - OP_AMP_VP_RAIL_OFFSET - POLEPOS_VREF, /* MAX */
0.0 - POLEPOS_VREF /* disabled CLAMP value */)
/************************************************
* Output
************************************************/
DISCRETE_OUTPUT(POLEPOS_CHANL1_SND, 32767/2)
DISCRETE_OUTPUT(POLEPOS_CHANL2_SND, 32767/2)
DISCRETE_OUTPUT(POLEPOS_CHANL3_SND, 32767/2)
// DISCRETE_OUTPUT(POLEPOS_CHANL4_SND, 32767/2)
DISCRETE_SOUND_END
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