/*************************************************************************** i8243.h Intel 8243 Port Expander Copyright Aaron Giles ***************************************************************************/ #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(_read) \ i8243_device::static_set_read_handler(*device, _read); \ #define MCFG_I8243_WRITEHANDLER(_write) \ i8243_device::static_set_write_handler(*device, _write); \ /*************************************************************************** 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); // inline configuration helpers static void static_set_read_handler(device_t &device, read8_device_func callback); static void static_set_write_handler(device_t &device, write8_device_func callback); UINT8 i8243_p2_r(UINT32 offset); void i8243_p2_w(UINT32 offset, UINT8 data); void i8243_prog_w(UINT32 offset, UINT8 data); protected: // device-level overrides virtual void device_start(); virtual void device_reset(); virtual void device_post_load() { } virtual void device_clock_changed() { } 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_cb; devcb_write8 m_writehandler_cb; devcb_resolved_read8 m_readhandler; devcb_resolved_write8 m_writehandler; }; // device type definition extern const device_type I8243; /*************************************************************************** PROTOTYPES ***************************************************************************/ READ8_DEVICE_HANDLER( i8243_p2_r ); WRITE8_DEVICE_HANDLER( i8243_p2_w ); WRITE8_DEVICE_HANDLER( i8243_prog_w ); #endif /* __I8243_H__ */