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// license:BSD-3-Clause
// copyright-holders:Dirk Best, Vas Crabb
/*****************************************************************************
 *
 *  DL1416
 *
 * 4-Digit 16-Segment Alphanumeric Intelligent Display
 * with Memory/Decoder/Driver
 *
 * See video/dl1416.cpp for more info
 *
 ****************************************************************************/

#ifndef MAME_VIDEO_DL1416_H
#define MAME_VIDEO_DL1416_H

#pragma once


/***************************************************************************
    DEVICE TYPES
***************************************************************************/

DECLARE_DEVICE_TYPE(DL1414T, dl1414_device)
DECLARE_DEVICE_TYPE(DL1416B, dl1416_device)
DECLARE_DEVICE_TYPE(DL1416T, dl1416_device)


/***************************************************************************
    TYPE DECLARATIONS
***************************************************************************/

class dl1414_device : public device_t
{
public:
	auto update() { return m_update_cb.bind(); }

	// signal-level interface
	virtual void wr_w(int state); // write strobe (rising edge)
	void addr_w(u8 state);
	void data_w(u8 state);

	// bus interface - still requires cu_w to set cursor enable state
	virtual void bus_w(offs_t offset, u8 data);

protected:
	dl1414_device(
			machine_config const &mconfig,
			device_type type,
			char const *tag,
			device_t *owner,
			u32 clock);

	// device-level overrides
	virtual void device_start() override;
	virtual void device_reset() override;

	void set_cursor_state(offs_t offset, bool state);
	virtual u16 translate(u8 digit, bool cursor) const = 0;

	// input line state
	bool m_wr_in;
	u8 m_addr_in;
	u8 m_data_in;

private:
	devcb_write16 m_update_cb;

	void do_update(offs_t offset);

	// internal state
	u8 m_digit_ram[4]; // holds the digit code for each position
	bool m_cursor_state[4]; // holds the cursor state for each position
};

class dl1416_device : public dl1414_device
{
public:
	virtual void wr_w(int state) override;
	void ce_w(int state); // chip enable (active low)
	void cu_w(int state); // cursor enable (active low)

protected:
	dl1416_device(
			machine_config const &mconfig,
			device_type type,
			char const *tag,
			device_t *owner,
			u32 clock);

	// device-level overrides
	virtual void device_start() override;

	bool cu_in() const { return m_cu_in; }

private:
	// input line state
	bool m_ce_in, m_ce_latch;
	bool m_cu_in;
	u8 m_addr_latch;
};

#endif // MAME_VIDEO_DL1416_H