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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************
Generic 8 bit and 16 bit latch devices
***************************************************************************/
#ifndef MAME_MACHINE_GEN_LATCH_H
#define MAME_MACHINE_GEN_LATCH_H
#pragma once
//**************************************************************************
// DEVICE TYPE DECLARATIONS
//**************************************************************************
DECLARE_DEVICE_TYPE(GENERIC_LATCH_8, generic_latch_8_device)
DECLARE_DEVICE_TYPE(GENERIC_LATCH_16, generic_latch_16_device)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> generic_latch_base_device
class generic_latch_base_device : public device_t
{
public:
// configuration
auto data_pending_callback() { return m_data_pending_cb.bind(); }
void set_separate_acknowledge(bool ack) { m_separate_acknowledge = ack; }
DECLARE_READ_LINE_MEMBER(pending_r);
u8 acknowledge_r(address_space &space);
void acknowledge_w(u8 data = 0);
protected:
// construction/destruction
generic_latch_base_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
virtual void device_start() override;
virtual void device_reset() override;
bool has_separate_acknowledge() const { return m_separate_acknowledge; }
bool is_latch_written() const { return m_latch_written; }
void set_latch_written(bool latch_written);
private:
void init_callback(s32 param);
bool m_separate_acknowledge;
bool m_latch_written;
devcb_write_line m_data_pending_cb;
};
// ======================> generic_latch_8_device
class generic_latch_8_device : public generic_latch_base_device
{
public:
// construction/destruction
generic_latch_8_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
u8 read();
void write(u8 data);
void preset_w(u8 data = 0xff);
void clear_w(u8 data = 0);
DECLARE_WRITE_LINE_MEMBER( preset );
DECLARE_WRITE_LINE_MEMBER( clear );
protected:
virtual void device_start() override;
void sync_callback(s32 param);
private:
u8 m_latched_value;
};
// ======================> generic_latch_16_device
class generic_latch_16_device : public generic_latch_base_device
{
public:
// construction/destruction
generic_latch_16_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
u16 read();
void write(u16 data);
void preset_w(u16 data = 0xffff);
void clear_w(u16 data = 0);
DECLARE_WRITE_LINE_MEMBER( preset );
DECLARE_WRITE_LINE_MEMBER( clear );
protected:
virtual void device_start() override;
void sync_callback(s32 param);
private:
u16 m_latched_value;
};
#endif // MAME_MACHINE_GEN_LATCH_H
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