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

    MSM6222B

    A somewhat hd44780-compatible LCD controller.

    The -01 variant has a fixed cgrom, the other variants are mask-programmed.

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

    Copyright Olivier Galibert
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

        * Redistributions of source code must retain the above copyright
          notice, this list of conditions and the following disclaimer.
        * Redistributions in binary form must reproduce the above copyright
          notice, this list of conditions and the following disclaimer in
          the documentation and/or other materials provided with the
          distribution.
        * Neither the name 'MAME' nor the names of its contributors may be
          used to endorse or promote products derived from this software
          without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY OLIVIER GALIBERT ''AS IS'' AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    DISCLAIMED. IN NO EVENT SHALL OLIVIER GALIBERT BE LIABLE FOR ANY DIRECT,
    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
    IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

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

#ifndef __MSM6222B_H__
#define __MSM6222B_H__

#define MCFG_MSM6222B_ADD( _tag ) \
	MCFG_DEVICE_ADD( _tag, MSM6222B, 0 )

#define MCFG_MSM6222B_01_ADD( _tag ) \
	MCFG_DEVICE_ADD( _tag, MSM6222B_01, 0 )

class msm6222b_device : public device_t {
public:
	msm6222b_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
	msm6222b_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock);

	void control_w(UINT8 data);
	UINT8 control_r();
	void data_w(UINT8 data);
	UINT8 data_r();

	// Character n bits are at bytes n*16..n*16+7 when 8-high, +10 when 11-high.  Only the low 5 bits are used.
	// In one line mode n = 0..79.  In two line mode first line is 0..39 and second is 40..79.
	const UINT8 *render();

protected:
	virtual void device_start();

private:
	UINT8 cgram[8*8];
	UINT8 ddram[80];
	UINT8 render_buf[80*16];
	bool cursor_direction, cursor_blinking, two_line, shift_on_write, double_height, cursor_on, display_on;
	UINT8 adc, shift;
	const UINT8 *cgrom;

	void cursor_step(bool direction);
	void shift_step(bool direction);
	bool blink_on() const;
};

class msm6222b_01_device : public msm6222b_device {
public:
	msm6222b_01_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);

protected:
	virtual const rom_entry *device_rom_region() const;
};

extern const device_type MSM6222B;
extern const device_type MSM6222B_01;

#endif