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// license:BSD-3-Clause
// copyright-holders:hap, Kevin Horton
/***************************************************************************

  Mitsubishi MELPS 4 MCU tabletops/handhelds or other simple devices,
  most of them are VFD electronic games/toys.

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

#include "emu.h"
#include "cpu/melps4/m58846.h"
#include "sound/speaker.h"

#include "hh_melps4_test.lh" // common test-layout - use external artwork


class hh_melps4_state : public driver_device
{
public:
	hh_melps4_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_inp_matrix(*this, "IN"),
		m_speaker(*this, "speaker"),
		m_display_wait(33),
		m_display_maxy(1),
		m_display_maxx(0)
	{ }

	// devices
	required_device<cpu_device> m_maincpu;
	optional_ioport_array<2> m_inp_matrix; // max 2
	optional_device<speaker_sound_device> m_speaker;

	// misc common
	UINT16 m_inp_mux;                   // multiplexed inputs mask

	UINT8 read_inputs(int columns);

	// display common
	int m_display_wait;                 // led/lamp off-delay in microseconds (default 33ms)
	int m_display_maxy;                 // display matrix number of rows
	int m_display_maxx;                 // display matrix number of columns (max 31 for now)

	UINT32 m_grid;                      // VFD current row data
	UINT32 m_plate;                     // VFD current column data

	UINT32 m_display_state[0x20];       // display matrix rows data (last bit is used for always-on)
	UINT16 m_display_segmask[0x20];     // if not 0, display matrix row is a digit, mask indicates connected segments
	UINT32 m_display_cache[0x20];       // (internal use)
	UINT8 m_display_decay[0x20][0x20];  // (internal use)

	TIMER_DEVICE_CALLBACK_MEMBER(display_decay_tick);
	void display_update();
	void set_display_size(int maxx, int maxy);
	void display_matrix(int maxx, int maxy, UINT32 setx, UINT32 sety);

protected:
	virtual void machine_start();
	virtual void machine_reset();
};


// machine start/reset

void hh_melps4_state::machine_start()
{
	// zerofill
	memset(m_display_state, 0, sizeof(m_display_state));
	memset(m_display_cache, ~0, sizeof(m_display_cache));
	memset(m_display_decay, 0, sizeof(m_display_decay));
	memset(m_display_segmask, 0, sizeof(m_display_segmask));

	m_inp_mux = 0;
	m_grid = 0;
	m_plate = 0;

	// register for savestates
	save_item(NAME(m_display_maxy));
	save_item(NAME(m_display_maxx));
	save_item(NAME(m_display_wait));

	save_item(NAME(m_display_state));
	/* save_item(NAME(m_display_cache)); */ // don't save!
	save_item(NAME(m_display_decay));
	save_item(NAME(m_display_segmask));

	save_item(NAME(m_inp_mux));
	save_item(NAME(m_grid));
	save_item(NAME(m_plate));
}

void hh_melps4_state::machine_reset()
{
}



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

  Helper Functions

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

// The device may strobe the outputs very fast, it is unnoticeable to the user.
// To prevent flickering here, we need to simulate a decay.

void hh_melps4_state::display_update()
{
	UINT32 active_state[0x20];

	for (int y = 0; y < m_display_maxy; y++)
	{
		active_state[y] = 0;

		for (int x = 0; x <= m_display_maxx; x++)
		{
			// turn on powered segments
			if (m_display_state[y] >> x & 1)
				m_display_decay[y][x] = m_display_wait;

			// determine active state
			UINT32 ds = (m_display_decay[y][x] != 0) ? 1 : 0;
			active_state[y] |= (ds << x);
		}
	}

	// on difference, send to output
	for (int y = 0; y < m_display_maxy; y++)
		if (m_display_cache[y] != active_state[y])
		{
			if (m_display_segmask[y] != 0)
				output_set_digit_value(y, active_state[y] & m_display_segmask[y]);

			const int mul = (m_display_maxx <= 10) ? 10 : 100;
			for (int x = 0; x <= m_display_maxx; x++)
			{
				int state = active_state[y] >> x & 1;
				char buf1[0x10]; // lampyx
				char buf2[0x10]; // y.x

				if (x == m_display_maxx)
				{
					// always-on if selected
					sprintf(buf1, "lamp%da", y);
					sprintf(buf2, "%d.a", y);
				}
				else
				{
					sprintf(buf1, "lamp%d", y * mul + x);
					sprintf(buf2, "%d.%d", y, x);
				}
				output_set_value(buf1, state);
				output_set_value(buf2, state);
			}
		}

	memcpy(m_display_cache, active_state, sizeof(m_display_cache));
}

TIMER_DEVICE_CALLBACK_MEMBER(hh_melps4_state::display_decay_tick)
{
	// slowly turn off unpowered segments
	for (int y = 0; y < m_display_maxy; y++)
		for (int x = 0; x <= m_display_maxx; x++)
			if (m_display_decay[y][x] != 0)
				m_display_decay[y][x]--;

	display_update();
}

void hh_melps4_state::set_display_size(int maxx, int maxy)
{
	m_display_maxx = maxx;
	m_display_maxy = maxy;
}

void hh_melps4_state::display_matrix(int maxx, int maxy, UINT32 setx, UINT32 sety)
{
	set_display_size(maxx, maxy);

	// update current state
	UINT32 mask = (1 << maxx) - 1;
	for (int y = 0; y < maxy; y++)
		m_display_state[y] = (sety >> y & 1) ? ((setx & mask) | (1 << maxx)) : 0;

	display_update();
}


UINT8 hh_melps4_state::read_inputs(int columns)
{
	UINT8 ret = 0;

	// read selected input rows
	for (int i = 0; i < columns; i++)
		if (m_inp_mux >> i & 1)
			ret |= m_inp_matrix[i]->read();

	return ret;
}



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

  Minidrivers (subclass, I/O, Inputs, Machine Config)

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

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

  Coleco Frogger (manufactured in Japan)
  * PCB label Coleco Frogger Code No. 01-81543, KS-003282 Japan
  * Mitsubishi M58846-701P MCU
  * cyan/red/green VFD display Itron CP5090GLR R1B, with partial color overlay

  NOTE!: MESS external artwork is recommended

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

class cfrogger_state : public hh_melps4_state
{
public:
	cfrogger_state(const machine_config &mconfig, device_type type, const char *tag)
		: hh_melps4_state(mconfig, type, tag)
	{ }

};

// handlers


// config

static INPUT_PORTS_START( cfrogger )
INPUT_PORTS_END

static MACHINE_CONFIG_START( cfrogger, cfrogger_state )

	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", M58846, XTAL_600kHz)

	MCFG_TIMER_DRIVER_ADD_PERIODIC("display_decay", hh_melps4_state, display_decay_tick, attotime::from_msec(1))
	MCFG_DEFAULT_LAYOUT(layout_hh_melps4_test)

	/* no video! */

	/* sound hardware */
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
MACHINE_CONFIG_END





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

  Game driver(s)

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

ROM_START( cfrogger )
	ROM_REGION( 0x1000, "maincpu", 0 )
	ROM_LOAD( "m58846-701p", 0x0000, 0x1000, CRC(ba52a242) SHA1(7fa53b617f4bb54be32eb209e9b88131e11cb518) )
ROM_END



/*    YEAR  NAME      PARENT COMPAT MACHINE  INPUT     INIT              COMPANY, FULLNAME, FLAGS */
CONS( 1981, cfrogger, 0,        0, cfrogger, cfrogger, driver_device, 0, "Coleco", "Frogger (Coleco)", GAME_SUPPORTS_SAVE | GAME_REQUIRES_ARTWORK | GAME_NOT_WORKING )