// license:BSD-3-Clause // copyright-holders:Michael Zapf /**************************************************************************** TMS9901 Programmable System Interface See tms9901.c for documentation Raphael Nabet Michael Zapf February 2012: Rewritten as class *****************************************************************************/ #ifndef MAME_MACHINE_TMS9901_H #define MAME_MACHINE_TMS9901_H DECLARE_DEVICE_TYPE(TMS9901, tms9901_device) /*************************************************************************** MACROS ***************************************************************************/ /*************************************************************************** CLASS DEFINITION ***************************************************************************/ class tms9901_device : public device_t { public: // Masks for the interrupts levels available on TMS9901 static constexpr int INT1 = 0x0002; static constexpr int INT2 = 0x0004; static constexpr int INT3 = 0x0008; // overridden by the timer interrupt static constexpr int INT4 = 0x0010; static constexpr int INT5 = 0x0020; static constexpr int INT6 = 0x0040; static constexpr int INT7 = 0x0080; static constexpr int INT8 = 0x0100; static constexpr int INT9 = 0x0200; static constexpr int INTA = 0x0400; static constexpr int INTB = 0x0800; static constexpr int INTC = 0x1000; static constexpr int INTD = 0x2000; static constexpr int INTE = 0x4000; static constexpr int INTF = 0x8000; enum { CB_INT7 = 0, INT8_INT15 = 1, P0_P7 = 2, P8_P15 = 3 }; tms9901_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); void set_single_int(int pin_number, int state); DECLARE_WRITE_LINE_MEMBER( rst1_line ); DECLARE_READ8_MEMBER( read ); DECLARE_WRITE8_MEMBER( write ); auto p_out_cb(int n) { return m_write_p[n].bind(); } auto read_cb() { return m_read_block.bind(); } auto intlevel_cb() { return m_interrupt.bind(); } uint16_t pio_outputs() const { return m_pio_output | ~m_pio_direction; } private: static constexpr device_timer_id DECREMENTER = 0; virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override; void timer_reload(); void field_interrupts(); void device_start() override; void device_stop() override; void device_reset() override; // Common method for device_reset and rst1_line void do_reset(); // State of the INT1-INT15 lines (must be inverted when queried) // Note that the levels must also be delivered when reading the pins, which // may require to latch the int levels. int m_int_state; int m_old_int_state; // stores the previous value to avoid useless INT line assertions int m_enabled_ints; // interrupt enable mask bool m_int_pending; // status of the int* pin (connected to TMS9900) bool m_timer_int_pending; // timer int pending (overrides int3 pin if timer enabled) // PIO registers int m_pio_direction; // direction register for PIO // current PIO output (to be masked with pio_direction) int m_pio_output; // mirrors used for INT7*-INT15* int m_pio_direction_mirror; int m_pio_output_mirror; // ======================================================================= // TMS9901 clock mode // false = so-called interrupt mode (read interrupt state, write interrupt enable mask) // true = clock mode (read/write clock interval) bool m_clock_mode; // MESS timer, used to emulate the decrementer register emu_timer *m_decrementer; // clock interval, loaded in decrementer when it reaches 0. // 0 means decrementer off int m_clock_register; // Current decrementer value int m_decrementer_value; // when we go into timer mode, the decrementer is copied there to allow to read it reliably int m_clock_read_register; // ======================================================================= // Read callback. devcb_read8 m_read_block; // I/O lines, used for output. When used as inputs, the levels are delivered via the m_read_block devcb_write_line m_write_p[16]; // The invocation corresponds to the INTREQ signal (with the level passed as data) // and the address delivers the interrupt level (0-15) devcb_write8 m_interrupt; }; #endif // MAME_MACHINE_TMS9901_H