// license:BSD-3-Clause
// copyright-holders:Derrick Renaud
/************************************************************************
 * sprint8 Sound System Analog emulation
 * Sept 2009, Derrick Renaud
 ************************************************************************/

#include "emu.h"

#include "sprint8_a.h"


/* Discrete Sound Output Nodes */
#define SPRINT8_NOISE               NODE_12
#define SPRINT8_MOTOR1_SND          NODE_13
#define SPRINT8_MOTOR2_SND          NODE_14
#define SPRINT8_MOTOR3_SND          NODE_15
#define SPRINT8_MOTOR4_SND          NODE_16
#define SPRINT8_MOTOR5_SND          NODE_17
#define SPRINT8_MOTOR6_SND          NODE_18
#define SPRINT8_MOTOR7_SND          NODE_19
#define SPRINT8_MOTOR8_SND          NODE_20
#define SPRINT8_CRASH_SCREECH_SND   NODE_21
#define SPRINT8_AUDIO_1_2           NODE_22
#define SPRINT8_AUDIO_3_7           NODE_23
#define SPRINT8_AUDIO_5_6           NODE_24
#define SPRINT8_AUDIO_4_8           NODE_25

/* Adjusters */
#define SPRINT8_R132_POT            NODE_29


/* Parts List - Resistors */
#define SPRINT8_R1      RES_K(47)
#define SPRINT8_R3      RES_K(47)
#define SPRINT8_R4      RES_K(47)
#define SPRINT8_R19     RES_K(1)
#define SPRINT8_R20     RES_K(1)
#define SPRINT8_R27     RES_K(18)
#define SPRINT8_R28     820
#define SPRINT8_R29     RES_K(330)
#define SPRINT8_R39     RES_K(120)
#define SPRINT8_R40     RES_K(22)
#define SPRINT8_R41     RES_K(150)
#define SPRINT8_R89     RES_K(22)
#define SPRINT8_R91     RES_K(47)
#define SPRINT8_R93     RES_K(2.2)
#define SPRINT8_R96     RES_K(47)
#define SPRINT8_R97     RES_K(2.2)
#define SPRINT8_R99     RES_K(27)
#define SPRINT8_R100    RES_K(1)
#define SPRINT8_R101    RES_K(2.2)
#define SPRINT8_R132    RES_K(100)
#define SPRINT8_R145    RES_K(3.3)
#define SPRINT8_R146    RES_K(7.5)
#define SPRINT8_R147    100
#define SPRINT8_R148    RES_K(1)
#define SPRINT8_R149    RES_K(22)

/* Parts List - Capacitors */
#define SPRINT8_C8      CAP_U(.01)
#define SPRINT8_C17     CAP_U(.001)
#define SPRINT8_C18     CAP_U(.047)
#define SPRINT8_C19     CAP_U(.047)
#define SPRINT8_C26     CAP_U(100)
#define SPRINT8_C27     CAP_U(.22)
#define SPRINT8_C28     CAP_U(.1)
#define SPRINT8_C59     CAP_U(.1)
#define SPRINT8_C63     CAP_U(.1)
#define SPRINT8_C64     CAP_U(.1)
#define SPRINT8_C89     CAP_U(.1)
#define SPRINT8_C90     CAP_U(.1)

#define SPRINT8_HSYNC   15750.0     /* not checked */
#define SPRINT8_1V  SPRINT8_HSYNC/2
#define SPRINT8_2V  SPRINT8_1V/2


static const discrete_lfsr_desc sprint8_lfsr =
{
	DISC_CLK_IS_FREQ,
	16,                 /* Bit Length */
	0,                  /* Reset Value */
	10,                 /* Use Bit 10 as XOR input 0 */
	15,                 /* Use Bit 15 as XOR input 1 */
	DISC_LFSR_XNOR,     /* Feedback stage1 is XNOR */
	DISC_LFSR_OR,       /* Feedback stage2 is just stage 1 output OR with external feed */
	DISC_LFSR_REPLACE,  /* Feedback stage3 replaces the shifted register contents */
	0x000001,           /* Everything is shifted into the first bit only */
	DISC_LFSR_FLAG_RESET_TYPE_L,    /* Output is not inverted */
	12                  /* Output bit */
};

static const discrete_555_desc sprint8_crash_555a_desc =
{
	DISC_555_OUT_ENERGY,
	5, DEFAULT_555_VALUES
};

static const discrete_integrate_info sprint8_crash_integrate =
{
	DISC_INTEGRATE_OP_AMP_1,
	SPRINT8_R99, SPRINT8_R97, SPRINT8_R96, SPRINT8_C59,     /*r1, r2, r3, c, */
	5, 5,                           /* v1, vP*/
	0, 0, 0                         /* no functions */
};

static const discrete_555_desc sprint8_motor_555a_desc =
{
	DISC_555_OUT_COUNT_F_X,
	5, DEFAULT_555_VALUES
};

static const discrete_555_desc sprint8_motor_555m_desc =
{
	DISC_555_OUT_ENERGY | DISC_555_TRIGGER_IS_COUNT,
	5, DEFAULT_555_VALUES
};

static const discrete_op_amp_filt_info sprint8_motor_filter =
{
	SPRINT8_R27, 0, SPRINT8_R28 + RES_2_PARALLEL(SPRINT8_R19, SPRINT8_R20), 0, SPRINT8_R29, /* r1, r2, r3, r4, rF, */
	SPRINT8_C18, SPRINT8_C19, 0,                                    /* c1, c2, c3, */
	5.0 * RES_VOLTAGE_DIVIDER(SPRINT8_R19, SPRINT8_R20), 5, 0       /* vRef, vP, vN */
};

static const discrete_mixer_desc sprint8_crash_screech_mixer =
{
	DISC_MIXER_IS_RESISTOR,
	{SPRINT8_R149, SPRINT8_R91},
	{0, NODE_80},                       /* R93 switched in/out of circuit */
	{0}, 0, 0, SPRINT8_C64, 0, 0, 1     /* c, rI, rF, cF, cAmp, vRef, gain */
};

static const discrete_mixer_desc sprint8_mixer =
{
	DISC_MIXER_IS_RESISTOR,
	{SPRINT8_R1 + SPRINT8_R100, SPRINT8_R3, SPRINT8_R4},
	{0}, {0}, 0, 0, 0, SPRINT8_C8, 0, 1     /* r_nodes, c, rI, rF, cF, cAmp, vRef, gain */
};


/************************************************
 * Car Motor
 ************************************************/
/* The first (astable) 555 generates a quick falling pulse that triggers the second (monostable) 555.
 * This pulse is passed through C17 and pulled up with R40.  This pulse is too fast to emulate so
 * we will just tell the monostable it was triggered once and ignore C17/R40.
 */
#define SPRINT8_MOTOR_CIRCUIT(_car)                                                             \
DISCRETE_RCFILTER(NODE_RELATIVE(NODE_30, _car - 1), NODE_RELATIVE(SPRINT8_MOTOR1_EN, _car - 1), SPRINT8_R89, SPRINT8_C26)   \
DISCRETE_ADDER2(NODE_RELATIVE(NODE_40, _car - 1), 1, NODE_RELATIVE(NODE_30, _car - 1), 0.7) /* add Q21 shift */                 \
DISCRETE_555_ASTABLE_CV(NODE_RELATIVE(NODE_50, _car - 1), 1, SPRINT8_R39, 0, SPRINT8_C27, NODE_RELATIVE(NODE_40, _car - 1), &sprint8_motor_555a_desc) \
DISCRETE_555_MSTABLE(NODE_RELATIVE(NODE_60, _car - 1), 1, NODE_RELATIVE(NODE_50, _car - 1), SPRINT8_R41, SPRINT8_C28, &sprint8_motor_555m_desc)       \
DISCRETE_OP_AMP_FILTER(NODE_RELATIVE(SPRINT8_MOTOR1_SND, _car - 1), 1, NODE_RELATIVE(NODE_60, _car - 1), 0, DISC_OP_AMP_FILTER_IS_BAND_PASS_1M, &sprint8_motor_filter)


DISCRETE_SOUND_START( sprint8_discrete )
	/************************************************
	 * Input register mapping
	 ************************************************/
	DISCRETE_INPUT_LOGIC(SPRINT8_CRASH_EN)
	DISCRETE_INPUT_NOT  (SPRINT8_SCREECH_EN)
	DISCRETE_INPUT_NOT  (SPRINT8_ATTRACT_EN)
	DISCRETE_INPUTX_LOGIC(SPRINT8_MOTOR1_EN, DEFAULT_TTL_V_LOGIC_1, 0, 0)
	DISCRETE_INPUTX_LOGIC(SPRINT8_MOTOR2_EN, DEFAULT_TTL_V_LOGIC_1, 0, 0)
	DISCRETE_INPUTX_LOGIC(SPRINT8_MOTOR3_EN, DEFAULT_TTL_V_LOGIC_1, 0, 0)
	DISCRETE_INPUTX_LOGIC(SPRINT8_MOTOR4_EN, DEFAULT_TTL_V_LOGIC_1, 0, 0)
	DISCRETE_INPUTX_LOGIC(SPRINT8_MOTOR5_EN, DEFAULT_TTL_V_LOGIC_1, 0, 0)
	DISCRETE_INPUTX_LOGIC(SPRINT8_MOTOR6_EN, DEFAULT_TTL_V_LOGIC_1, 0, 0)
	DISCRETE_INPUTX_LOGIC(SPRINT8_MOTOR7_EN, DEFAULT_TTL_V_LOGIC_1, 0, 0)
	DISCRETE_INPUTX_LOGIC(SPRINT8_MOTOR8_EN, DEFAULT_TTL_V_LOGIC_1, 0, 0)

	DISCRETE_TASK_START(0)
	DISCRETE_ADJUSTMENT(SPRINT8_R132_POT, 0, SPRINT8_R132, DISC_LINADJ, "R132")

	/************************************************
	 * Noise Generator, Crash, Screech
	 ************************************************/
	/* Address line A2 is used to XOR the feedback bits.
	 * This can not easily be implemented, so I just set the
	 * feedback as XNOR. */
	DISCRETE_LFSR_NOISE(SPRINT8_NOISE,          /* IC F7, pin 13 */
		1,                                      /* ENAB */
		SPRINT8_ATTRACT_EN,                     /* RESET */
		SPRINT8_2V, 1, 0, 0.5, &sprint8_lfsr)   /* CLK,AMPL,FEED,BIAS,LFSRTB */

	DISCRETE_TASK_END()

	DISCRETE_TASK_START(1)
	DISCRETE_GAIN(NODE_70, SPRINT8_NOISE, DEFAULT_TTL_V_LOGIC_1 * RES_VOLTAGE_DIVIDER(SPRINT8_R148, SPRINT8_R147))
	DISCRETE_CRFILTER_VREF(NODE_71,
		NODE_70,                                /* IN0 */
		RES_2_PARALLEL(SPRINT8_R148, SPRINT8_R147) + RES_2_PARALLEL(RES_K(5), RES_K(10)),
		SPRINT8_C90,
		5.0 * RES_VOLTAGE_DIVIDER(RES_K(5), RES_K(10)))     /* ref to 555 CV pin */
	DISCRETE_555_ASTABLE_CV(NODE_72,
		SPRINT8_SCREECH_EN,                     /* RESET */
		SPRINT8_R145, SPRINT8_R146, SPRINT8_C89,
		NODE_71,                                /* CTRLV */
		&sprint8_crash_555a_desc)
	DISCRETE_INTEGRATE(NODE_73, SPRINT8_CRASH_EN, 0, &sprint8_crash_integrate)

	DISCRETE_SWITCH(NODE_80,
		1,                                      /* ENAB */
		SPRINT8_NOISE,                          /* SWITCH */
		SPRINT8_R93, 1)                         /* INP0,INP1*/
	DISCRETE_SWITCH(NODE_74,                    /* effect of Q20 */
		1,                                      /* ENAB */
		SPRINT8_NOISE,                          /* SWITCH */
		NODE_73, 0)                             /* INP0,INP1*/
	DISCRETE_MIXER2(NODE_75,
		1,                                      /* ENAB */
		NODE_72,
		NODE_74,
		&sprint8_crash_screech_mixer)

	DISCRETE_CRFILTER_VREF(NODE_76,
		NODE_75,                                /* IN0 */
		SPRINT8_R93 + SPRINT8_R91, SPRINT8_C63,
		5)                                      /* VREF */
	/* IC E5, pin 14 gain.  Does not simulate minor DC offset caused by R93. */
	DISCRETE_TRANSFORM5(NODE_77, NODE_76, 5, SPRINT8_R132_POT, SPRINT8_R101, 1, "01-23/4+*1+")
	DISCRETE_CLAMP(SPRINT8_CRASH_SCREECH_SND, NODE_77, 0, 15.0 - 1.5)
	DISCRETE_TASK_END()

	/************************************************
	 * Car Motor
	 ************************************************/
	DISCRETE_TASK_START(1)
	SPRINT8_MOTOR_CIRCUIT(1)
	SPRINT8_MOTOR_CIRCUIT(2)
	DISCRETE_TASK_END()

	DISCRETE_TASK_START(1)
	SPRINT8_MOTOR_CIRCUIT(3)
	SPRINT8_MOTOR_CIRCUIT(7)
	DISCRETE_TASK_END()

	DISCRETE_TASK_START(1)
	SPRINT8_MOTOR_CIRCUIT(5)
	SPRINT8_MOTOR_CIRCUIT(6)
	DISCRETE_TASK_END()

	DISCRETE_TASK_START(1)
	SPRINT8_MOTOR_CIRCUIT(4)
	SPRINT8_MOTOR_CIRCUIT(8)
	DISCRETE_TASK_END()

	/************************************************
	 * Final Mix
	 ************************************************/
	DISCRETE_TASK_START(2)
	DISCRETE_MIXER3(SPRINT8_AUDIO_1_2,
		SPRINT8_ATTRACT_EN,             /* ENAB */
		SPRINT8_CRASH_SCREECH_SND,
		SPRINT8_MOTOR1_SND,
		SPRINT8_MOTOR2_SND,
		&sprint8_mixer)
	DISCRETE_MIXER3(SPRINT8_AUDIO_3_7,
		SPRINT8_ATTRACT_EN,             /* ENAB */
		SPRINT8_CRASH_SCREECH_SND,
		SPRINT8_MOTOR3_SND,
		SPRINT8_MOTOR7_SND,
		&sprint8_mixer)
	DISCRETE_MIXER3(SPRINT8_AUDIO_5_6,
		SPRINT8_ATTRACT_EN,             /* ENAB */
		SPRINT8_CRASH_SCREECH_SND,
		SPRINT8_MOTOR5_SND,
		SPRINT8_MOTOR6_SND,
		&sprint8_mixer)
	DISCRETE_MIXER3(SPRINT8_AUDIO_4_8,
		SPRINT8_ATTRACT_EN,             /* ENAB */
		SPRINT8_CRASH_SCREECH_SND,
		SPRINT8_MOTOR4_SND,
		SPRINT8_MOTOR8_SND,
		&sprint8_mixer)
	DISCRETE_OUTPUT(SPRINT8_AUDIO_1_2, 65500.0/8)
	DISCRETE_OUTPUT(SPRINT8_AUDIO_3_7, 65500.0/8)
	DISCRETE_OUTPUT(SPRINT8_AUDIO_5_6, 65500.0/8)
	DISCRETE_OUTPUT(SPRINT8_AUDIO_4_8, 65500.0/8)
	DISCRETE_TASK_END()
DISCRETE_SOUND_END
