// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************
Generic 8bit 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)
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_GENERIC_LATCH_8_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, GENERIC_LATCH_8, 0)
#define MCFG_GENERIC_LATCH_16_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, GENERIC_LATCH_16, 0)
#define MCFG_GENERIC_LATCH_DATA_PENDING_CB(_devcb) \
devcb = &downcast<generic_latch_base_device &>(*device).set_data_pending_callback(DEVCB_##_devcb);
#define MCFG_GENERIC_LATCH_SEPARATE_ACKNOWLEDGE(_ack) \
downcast<generic_latch_base_device &>(*device).set_separate_acknowledge(_ack);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> generic_latch_base_device
class generic_latch_base_device : public device_t
{
public:
// configuration
template <class Object> devcb_base &set_data_pending_callback(Object &&cb) { return m_data_pending_cb.set_callback(std::forward<Object>(cb)); }
void set_separate_acknowledge(bool ack) { m_separate_acknowledge = ack; }
DECLARE_READ_LINE_MEMBER(pending_r);
DECLARE_READ8_MEMBER( acknowledge_r );
DECLARE_WRITE8_MEMBER( acknowledge_w );
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(void *ptr, 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);
DECLARE_READ8_MEMBER( read );
DECLARE_WRITE8_MEMBER( write );
DECLARE_WRITE8_MEMBER( preset_w );
DECLARE_WRITE8_MEMBER( clear_w );
DECLARE_WRITE_LINE_MEMBER( preset );
DECLARE_WRITE_LINE_MEMBER( clear );
void preset_w(u8 value) { m_latched_value = value; }
protected:
virtual void device_start() override;
void sync_callback(void *ptr, 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);
DECLARE_READ16_MEMBER( read );
DECLARE_WRITE16_MEMBER( write );
DECLARE_WRITE16_MEMBER( preset_w );
DECLARE_WRITE16_MEMBER( clear_w );
DECLARE_WRITE_LINE_MEMBER( preset );
DECLARE_WRITE_LINE_MEMBER( clear );
void preset_w(u16 value) { m_latched_value = value; }
protected:
virtual void device_start() override;
void sync_callback(void *ptr, s32 param);
private:
u16 m_latched_value;
};
#endif // MAME_MACHINE_GEN_LATCH_H