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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
i8243.h
Intel 8243 Port Expander
***************************************************************************/
#ifndef MAME_MACHINE_I8243_H
#define MAME_MACHINE_I8243_H
#pragma once
/***************************************************************************
DEVICE CONFIGURATION MACROS
***************************************************************************/
#define MCFG_I8243_ADD(_tag, _read, _write) \
MCFG_DEVICE_ADD(_tag, I8243, 0) \
MCFG_I8243_READHANDLER(_read) \
MCFG_I8243_WRITEHANDLER(_write)
#define MCFG_I8243_READHANDLER(_devcb) \
downcast<i8243_device &>(*device).set_read_handler(DEVCB_##_devcb);
#define MCFG_I8243_WRITEHANDLER(_devcb) \
downcast<i8243_device &>(*device).set_write_handler(DEVCB_##_devcb);
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
// ======================> i8243_device
class i8243_device : public device_t
{
public:
// construction/destruction
i8243_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// configuration helpers
template <class Object> devcb_base &set_read_handler(Object &&cb) { return m_readhandler.set_callback(std::forward<Object>(cb)); }
template <class Object> devcb_base &set_write_handler(Object &&cb) { return m_writehandler.set_callback(std::forward<Object>(cb)); }
DECLARE_READ8_MEMBER(p2_r);
DECLARE_WRITE8_MEMBER(p2_w);
DECLARE_WRITE_LINE_MEMBER(prog_w);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_post_load() override { }
virtual void device_clock_changed() override { }
private:
uint8_t m_p[4]; /* 4 ports' worth of data */
uint8_t m_p2out; /* port 2 bits that will be returned */
uint8_t m_p2; /* most recent port 2 value */
uint8_t m_opcode; /* latched opcode */
uint8_t m_prog; /* previous PROG state */
devcb_read8 m_readhandler;
devcb_write8 m_writehandler;
};
// device type definition
DECLARE_DEVICE_TYPE(I8243, i8243_device)
#endif /* __I8243_H__ */
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