/***************************************************************************

    Videa Gridlee hardware

    driver by Aaron Giles

    special thanks to Howard Delman, Roger Hector and Ed Rotberg for
    allowing distribution of the Gridlee ROMs

    Based on the Bally/Sente SAC system

    Games supported:
        * Gridlee

    Known bugs:
        * analog sound hardware is unemulated

****************************************************************************

    Memory map

****************************************************************************

    ========================================================================
    CPU #1
    ========================================================================
    0000-007F   R/W   xxxxxxxx    Sprite RAM (32 entries x 4 bytes)
                R/W   xxxxxxxx       (0: image number)
                R/W   --------       (1: unused?)
                R/W   xxxxxxxx       (2: Y position, offset by 17 pixels)
                R/W   xxxxxxxx       (3: X position)
    0080-07FF   R/W   xxxxxxxx    Program RAM
    0800-7FFF   R/W   xxxxxxxx    Video RAM (256x240 pixels)
                R/W   xxxx----       (left pixel)
                R/W   ----xxxx       (right pixel)
    9000          W   -------x    Player 1 LED
    9010          W   -------x    Player 2 LED
    9020          W   -------x    Coin counter
    9060          W   -------x    Unknown (written once at startup)
    9070          W   -------x    Cocktail flip
    9200          W   --xxxxxx    Palette base select
    9380          W   --------    Watchdog reset
    9500        R     ---xxxxx    Trackball Y position
                R     ---x----    Sign of delta
                R     ----xxxx    Cumulative magnitude
    9501        R     ---xxxxx    Trackball X position
                R     ---x----    Sign of delta
                R     ----xxxx    Cumulative magnitude
    9502        R     ------x-    Fire button 2
                R     -------x    Fire button 1
    9503        R     --xx----    Coinage switches
                R     ----x---    2 player start
                R     -----x--    1 player start
                R     ------x-    Right coin
                R     -------x    Left coin
    9600        R     x-------    Reset game data switch
                R     -x------    Reset hall of fame switch
                R     --x-----    Cocktail/upright switch
                R     ---x----    Free play switch
                R     ----xx--    Lives switches
                R     ------xx    Bonus lives switches
    9700        R     x-------    VBLANK
                R     -x------    Service advance
                R     --x-----    Service switch
    9820        R     xxxxxxxx    Random number generator
    9828-982C     W   ????????    Unknown
    9830-983F     W   ????????    Unknown (sound-related)
    9C00-9CFF   R/W   --------    NVRAM
    A000-FFFF   R     xxxxxxxx    Fixed program ROM
    ========================================================================
    Interrupts:
        NMI not connected
        IRQ generated by 32L
        FIRQ generated by ??? (but should be around scanline 92)
    ========================================================================

***************************************************************************/


#include "driver.h"
#include "cpu/m6809/m6809.h"
#include "gridlee.h"
#include "balsente.h"
#include "sound/samples.h"


/* constants */
#define FIRQ_SCANLINE 92


/* local variables */
static UINT8 last_analog_input[2];
static UINT8 last_analog_output[2];

/* random number generator states */
static UINT8 *poly17 = NULL;
static UINT8 *rand17 = NULL;

/* local prototypes */
static void poly17_init(void);

/* local timers */
static emu_timer *irq_off;
static emu_timer *irq_timer;
static emu_timer *firq_off;
static emu_timer *firq_timer;

/*************************************
 *
 *  Interrupt handling
 *
 *************************************/

static TIMER_CALLBACK( irq_off_tick )
{
	cpu_set_input_line(machine->cpu[0], M6809_IRQ_LINE, CLEAR_LINE);
}


static TIMER_CALLBACK( irq_timer_tick )
{
	/* next interrupt after scanline 256 is scanline 64 */
	if (param == 256)
        timer_adjust_oneshot(irq_timer, video_screen_get_time_until_pos(machine->primary_screen, 64, 0), 64);
	else
        timer_adjust_oneshot(irq_timer, video_screen_get_time_until_pos(machine->primary_screen, param + 64, 0), param + 64);

	/* IRQ starts on scanline 0, 64, 128, etc. */
	cpu_set_input_line(machine->cpu[0], M6809_IRQ_LINE, ASSERT_LINE);

	/* it will turn off on the next HBLANK */
    timer_adjust_oneshot(irq_off, video_screen_get_time_until_pos(machine->primary_screen, param, BALSENTE_HBSTART), 0);
}


static TIMER_CALLBACK( firq_off_tick )
{
	cpu_set_input_line(machine->cpu[0], M6809_FIRQ_LINE, CLEAR_LINE);
}


static TIMER_CALLBACK( firq_timer_tick )
{
	/* same time next frame */
    timer_adjust_oneshot(firq_timer, video_screen_get_time_until_pos(machine->primary_screen, FIRQ_SCANLINE, 0), 0);

	/* IRQ starts on scanline FIRQ_SCANLINE? */
	cpu_set_input_line(machine->cpu[0], M6809_FIRQ_LINE, ASSERT_LINE);

	/* it will turn off on the next HBLANK */
    timer_adjust_oneshot(firq_off, video_screen_get_time_until_pos(machine->primary_screen, FIRQ_SCANLINE, BALSENTE_HBSTART), 0);
}

static MACHINE_START( gridlee )
{
    /* create the polynomial tables */
    poly17_init();

    state_save_register_global_array(machine, last_analog_input);
    state_save_register_global_array(machine, last_analog_output);

    irq_off = timer_alloc(machine, irq_off_tick, 0);
    irq_timer = timer_alloc(machine, irq_timer_tick, 0);
    firq_off = timer_alloc(machine, firq_off_tick, 0);
    firq_timer = timer_alloc(machine, firq_timer_tick, 0);
}


static MACHINE_RESET( gridlee )
{
	/* start timers to generate interrupts */
    timer_adjust_oneshot(irq_timer, video_screen_get_time_until_pos(machine->primary_screen, 0, 0), 0);
    timer_adjust_oneshot(firq_timer, video_screen_get_time_until_pos(machine->primary_screen, FIRQ_SCANLINE, 0), 0);
}



/*************************************
 *
 *  ADC handlers
 *
 *************************************/

static READ8_HANDLER( analog_port_r )
{
	int delta, sign, magnitude;
	UINT8 newval;
	static const char *const portnames[] = { "TRACK0_Y", "TRACK0_X", "TRACK1_Y", "TRACK1_X" };

	/* first read the new trackball value and compute the signed delta */
	newval = input_port_read(space->machine, portnames[offset + 2 * gridlee_cocktail_flip]);
	delta = (int)newval - (int)last_analog_input[offset];

	/* handle the case where we wrap around from 0x00 to 0xff, or vice versa */
	if (delta >= 0x80)
		delta -= 0x100;
	if (delta <= -0x80)
		delta += 0x100;

	/* just return the previous value for deltas less than 2, which are ignored */
	if (delta >= -1 && delta <= 1)
		return last_analog_output[offset];
	last_analog_input[offset] = newval;

	/* compute the sign and the magnitude */
	sign = (delta < 0) ? 0x10 : 0x00;
	magnitude = (delta < 0) ? -delta : delta;

	/* add the magnitude to the running total */
	last_analog_output[offset] += magnitude;

	/* or in the sign bit and return that */
	return (last_analog_output[offset] & 15) | sign;
}



/*************************************
 *
 *  MM5837 noise generator
 *
 *  NOTE: this is stolen straight from
 *          POKEY.c
 *
 *  NOTE: this is assumed to be the
 *          same as balsente.c
 *
 *************************************/

#define POLY17_BITS 17
#define POLY17_SIZE ((1 << POLY17_BITS) - 1)
#define POLY17_SHL	7
#define POLY17_SHR	10
#define POLY17_ADD	0x18000

static void poly17_init(void)
{
	UINT32 i, x = 0;
	UINT8 *p, *r;

	/* allocate memory */
	p = poly17 = auto_malloc(2 * (POLY17_SIZE + 1));
	r = rand17 = poly17 + POLY17_SIZE + 1;

	/* generate the polynomial */
	for (i = 0; i < POLY17_SIZE; i++)
	{
        /* store new values */
		*p++ = x & 1;
		*r++ = x >> 3;

        /* calculate next bit */
		x = ((x << POLY17_SHL) + (x >> POLY17_SHR) + POLY17_ADD) & POLY17_SIZE;
	}
}



/*************************************
 *
 *  Hardware random numbers
 *
 *************************************/

static READ8_HANDLER( random_num_r )
{
	UINT32 cc;

	/* CPU runs at 1.25MHz, noise source at 100kHz --> multiply by 12.5 */
	cc = cpu_get_total_cycles(space->cpu);

	/* 12.5 = 8 + 4 + 0.5 */
	cc = (cc << 3) + (cc << 2) + (cc >> 1);
	return rand17[cc & POLY17_SIZE];
}



/*************************************
 *
 *  Misc handlers
 *
 *************************************/

static WRITE8_HANDLER( led_0_w )
{
	set_led_status(0, data & 1);
	logerror("LED 0 %s\n", (data & 1) ? "on" : "off");
}


static WRITE8_HANDLER( led_1_w )
{
	set_led_status(1, data & 1);
	logerror("LED 1 %s\n", (data & 1) ? "on" : "off");
}


static WRITE8_HANDLER( gridlee_coin_counter_w )
{
	coin_counter_w(0, data & 1);
	logerror("coin counter %s\n", (data & 1) ? "on" : "off");
}



/*************************************
 *
 *  Main CPU memory handlers
 *
 *************************************/

/* CPU 1 read addresses */
static ADDRESS_MAP_START( readmem_cpu1, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x7fff) AM_READ(SMH_RAM)
	AM_RANGE(0x9500, 0x9501) AM_READ(analog_port_r)
	AM_RANGE(0x9502, 0x9502) AM_READ_PORT("IN0")
	AM_RANGE(0x9503, 0x9503) AM_READ_PORT("IN1")
	AM_RANGE(0x9600, 0x9600) AM_READ_PORT("DSW")
	AM_RANGE(0x9700, 0x9700) AM_READ_PORT("IN2")
	AM_RANGE(0x9820, 0x9820) AM_READ(random_num_r)
	AM_RANGE(0x9c00, 0x9cff) AM_READ(SMH_RAM)
	AM_RANGE(0xa000, 0xffff) AM_READ(SMH_ROM)
ADDRESS_MAP_END


static ADDRESS_MAP_START( writemem_cpu1, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x07ff) AM_WRITE(SMH_RAM) AM_BASE(&spriteram)
	AM_RANGE(0x0800, 0x7fff) AM_WRITE(gridlee_videoram_w) AM_BASE(&videoram) AM_SIZE(&videoram_size)
	AM_RANGE(0x9000, 0x9000) AM_WRITE(led_0_w)
	AM_RANGE(0x9010, 0x9010) AM_WRITE(led_1_w)
	AM_RANGE(0x9020, 0x9020) AM_WRITE(gridlee_coin_counter_w)
/*  { 0x9060, 0x9060, unknown - only written to at startup */
	AM_RANGE(0x9070, 0x9070) AM_WRITE(gridlee_cocktail_flip_w)
	AM_RANGE(0x9200, 0x9200) AM_WRITE(gridlee_palette_select_w)
	AM_RANGE(0x9380, 0x9380) AM_WRITE(watchdog_reset_w)
	AM_RANGE(0x9700, 0x9700) AM_WRITENOP
	AM_RANGE(0x9828, 0x993f) AM_WRITE(gridlee_sound_w)
	AM_RANGE(0x9c00, 0x9cff) AM_WRITE(SMH_RAM) AM_BASE(&generic_nvram) AM_SIZE(&generic_nvram_size)
	AM_RANGE(0xa000, 0xffff) AM_WRITE(SMH_ROM)
ADDRESS_MAP_END



/*************************************
 *
 *  Port definitions
 *
 *************************************/

static INPUT_PORTS_START( gridlee )
	PORT_START("TRACK0_Y")	/* 9500 (fake) */
    PORT_BIT( 0xff, 0, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(20) PORT_KEYDELTA(8)

	PORT_START("TRACK0_X")	/* 9501 (fake) */
    PORT_BIT( 0xff, 0, IPT_TRACKBALL_X ) PORT_SENSITIVITY(20) PORT_KEYDELTA(8) PORT_REVERSE

	PORT_START("TRACK1_Y")	/* 9500 (fake) */
    PORT_BIT( 0xff, 0, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(20) PORT_KEYDELTA(8) PORT_COCKTAIL

	PORT_START("TRACK1_X")	/* 9501 (fake) */
    PORT_BIT( 0xff, 0, IPT_TRACKBALL_X ) PORT_SENSITIVITY(20) PORT_KEYDELTA(8) PORT_REVERSE PORT_COCKTAIL

	PORT_START("IN0")		/* 9502 */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
	PORT_BIT( 0xfc, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START("IN1")		/* 9503 */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_START2 )
	PORT_DIPNAME( 0x30, 0x00, DEF_STR( Coinage ))
	PORT_DIPSETTING(    0x20, DEF_STR( 2C_1C ))
	PORT_DIPSETTING(    0x00, DEF_STR( 1C_1C ))
	PORT_DIPSETTING(    0x10, DEF_STR( 1C_2C ))
	PORT_BIT( 0xc0, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START("DSW")		/* 9600 */
	PORT_DIPNAME( 0x03, 0x01, DEF_STR( Bonus_Life ))
	PORT_DIPSETTING(    0x00, "8000 points" )
	PORT_DIPSETTING(    0x01, "10000 points" )
	PORT_DIPSETTING(    0x02, "12000 points" )
	PORT_DIPSETTING(    0x03, "14000 points" )
	PORT_DIPNAME( 0x0c, 0x04, DEF_STR( Lives ))
	PORT_DIPSETTING(    0x00, "2" )
	PORT_DIPSETTING(    0x04, "3" )
	PORT_DIPSETTING(    0x08, "4" )
	PORT_DIPSETTING(    0x0c, "5" )
	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Free_Play ))
	PORT_DIPSETTING(    0x00, DEF_STR( Off ))
	PORT_DIPSETTING(    0x10, DEF_STR( On ))
	PORT_DIPNAME( 0x20, 0x00, DEF_STR( Cabinet ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Upright ) )
	PORT_DIPSETTING(    0x20, DEF_STR( Cocktail ) )
	PORT_DIPNAME( 0x40, 0x00, "Reset Hall of Fame" )
	PORT_DIPSETTING(    0x00, DEF_STR( No ))
	PORT_DIPSETTING(    0x40, DEF_STR( Yes ))
	PORT_DIPNAME( 0x80, 0x00, "Reset Game Data" )
	PORT_DIPSETTING(    0x00, DEF_STR( No ))
	PORT_DIPSETTING(    0x80, DEF_STR( Yes ))

	PORT_START("IN2")		/* 9700 */
	PORT_BIT( 0x1f, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_SERVICE( 0x20, IP_ACTIVE_LOW )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_SERVICE1 )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_VBLANK )
INPUT_PORTS_END



/*************************************
 *
 *  Sound definitions
 *
 *************************************/

static const char *const sample_names[] =
{
	"*gridlee",
	"bounce1.wav",
	"bounce2.wav",
	0	/* end of array */
};

static const samples_interface gridlee_samples_interface =
{
	8,	/* 8 channels */
	sample_names
};



/*************************************
 *
 *  Machine driver
 *
 *************************************/

static MACHINE_DRIVER_START( gridlee )

	/* basic machine hardware */
	MDRV_CPU_ADD("maincpu", M6809, BALSENTE_CPU_CLOCK)
	MDRV_CPU_PROGRAM_MAP(readmem_cpu1,writemem_cpu1)

    MDRV_MACHINE_START(gridlee)
	MDRV_MACHINE_RESET(gridlee)
	MDRV_NVRAM_HANDLER(generic_0fill)

	/* video hardware */
	MDRV_SCREEN_ADD("screen", RASTER)
	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
	MDRV_SCREEN_RAW_PARAMS(BALSENTE_PIXEL_CLOCK, BALSENTE_HTOTAL, BALSENTE_HBEND, BALSENTE_HBSTART, BALSENTE_VTOTAL, BALSENTE_VBEND, BALSENTE_VBSTART)

	MDRV_PALETTE_LENGTH(2048)

	MDRV_PALETTE_INIT(gridlee)
	MDRV_VIDEO_START(gridlee)
	MDRV_VIDEO_UPDATE(gridlee)

	/* sound hardware */
	MDRV_SPEAKER_STANDARD_MONO("mono")

	MDRV_SOUND_ADD("gridlee", GRIDLEE, 0)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)

	MDRV_SOUND_ADD("samples", SAMPLES, 0)
	MDRV_SOUND_CONFIG(gridlee_samples_interface)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.40)
MACHINE_DRIVER_END



/*************************************
 *
 *  ROM definitions
 *
 *************************************/

ROM_START( gridlee )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "gridfnla.bin", 0xa000, 0x1000, CRC(1c43539e) SHA1(8b4a6f5c2c22bb021937157606d2129e2b01f718) )
	ROM_LOAD( "gridfnlb.bin", 0xb000, 0x1000, CRC(c48b91b8) SHA1(651210470ddf7c14f16f6c3046a9b8e903824ab8) )
	ROM_LOAD( "gridfnlc.bin", 0xc000, 0x1000, CRC(6ad436dd) SHA1(f393b63077f249d34a8e85649aea58b27a0425b1) )
	ROM_LOAD( "gridfnld.bin", 0xd000, 0x1000, CRC(f7188ddb) SHA1(eeb3f7dd8c61689cdd9992280ee1b3b5dc79a54c) )
	ROM_LOAD( "gridfnle.bin", 0xe000, 0x1000, CRC(d5330bee) SHA1(802bb5705d4cd22d556c1bcbcf730d688ca8e8ab) )
	ROM_LOAD( "gridfnlf.bin", 0xf000, 0x1000, CRC(695d16a3) SHA1(53d22cbedbedad8c89a964b6a38b7075c43cf03b) )

	ROM_REGION( 0x4000, "gfx1", 0 )
	ROM_LOAD( "gridpix0.bin", 0x0000, 0x1000, CRC(e6ea15ae) SHA1(2c482e25ea44aafd63ca5533b5a2e2dd8bf89365) )
	ROM_LOAD( "gridpix1.bin", 0x1000, 0x1000, CRC(d722f459) SHA1(8cad028eefbba387bdd57fb8bb3a855ae314fb32) )
	ROM_LOAD( "gridpix2.bin", 0x2000, 0x1000, CRC(1e99143c) SHA1(89c2f772cd15f2c37c8167a03dc4c7d1c923e4c3) )
	ROM_LOAD( "gridpix3.bin", 0x3000, 0x1000, CRC(274342a0) SHA1(818cfd4132183d922ff4585c73f2cd6e4546c75b) )

	ROM_REGION( 0x1800, "proms", 0 )
	ROM_LOAD( "grdrprom.bin", 0x0000, 0x800, CRC(f28f87ed) SHA1(736f38c3ec5455de1266aad348ba708d7201b21a) )
	ROM_LOAD( "grdgprom.bin", 0x0800, 0x800, CRC(921b0328) SHA1(59d1a3d3a90bd680a75adca5dd1b4682236c673b) )
	ROM_LOAD( "grdbprom.bin", 0x1000, 0x800, CRC(04350348) SHA1(098fec3073143e0b8746e728d7d321f2a353286f) )
ROM_END



/*************************************
 *
 *  Game drivers
 *
 *************************************/

GAME( 1983, gridlee, 0,        gridlee, gridlee, 0,     ROT0, "Videa", "Gridlee", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
