// license:BSD-3-Clause // copyright-holders:Aaron Giles /*************************************************************************** i8243.h Intel 8243 Port Expander ***************************************************************************/ #pragma once #ifndef __I8243_H__ #define __I8243_H__ #include "emu.h" #include "cpu/mcs48/mcs48.h" /*************************************************************************** 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) \ devcb = &i8243_device::set_read_handler(*device, DEVCB_##_devcb); #define MCFG_I8243_WRITEHANDLER(_devcb) \ devcb = &i8243_device::set_write_handler(*device, 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 clock); // static configuration helpers template static devcb_base &set_read_handler(device_t &device, _Object object) { return downcast(device).m_readhandler.set_callback(object); } template static devcb_base &set_write_handler(device_t &device, _Object object) { return downcast(device).m_writehandler.set_callback(object); } DECLARE_READ8_MEMBER(i8243_p2_r); DECLARE_WRITE8_MEMBER(i8243_p2_w); DECLARE_WRITE8_MEMBER(i8243_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 m_p[4]; /* 4 ports' worth of data */ UINT8 m_p2out; /* port 2 bits that will be returned */ UINT8 m_p2; /* most recent port 2 value */ UINT8 m_opcode; /* latched opcode */ UINT8 m_prog; /* previous PROG state */ devcb_read8 m_readhandler; devcb_write8 m_writehandler; }; // device type definition extern const device_type I8243; #endif /* __I8243_H__ */