// license:BSD-3-Clause // copyright-holders:Peter Trauner, Mathis Rosenhauer /********************************************************************** Rockwell 6522 VIA interface and emulation This function emulates all the functionality of 6522 versatile interface adapters. This is based on the pre-existing 6821 emulation. Written by Mathis Rosenhauer **********************************************************************/ #ifndef MAME_MACHINE_6522VIA_H #define MAME_MACHINE_6522VIA_H #pragma once /*************************************************************************** TYPE DEFINITIONS ***************************************************************************/ // ======================> via6522_device class via6522_device : public device_t { public: enum { VIA_PB = 0, VIA_PA = 1, VIA_DDRB = 2, VIA_DDRA = 3, VIA_T1CL = 4, VIA_T1CH = 5, VIA_T1LL = 6, VIA_T1LH = 7, VIA_T2CL = 8, VIA_T2CH = 9, VIA_SR = 10, VIA_ACR = 11, VIA_PCR = 12, VIA_IFR = 13, VIA_IER = 14, VIA_PANH = 15 }; // construction/destruction via6522_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); // TODO: REMOVE THESE auto readpa_handler() { return m_in_a_handler.bind(); } auto readpb_handler() { return m_in_b_handler.bind(); } // TODO: CONVERT THESE TO WRITE LINE auto writepa_handler() { return m_out_a_handler.bind(); } auto writepb_handler() { return m_out_b_handler.bind(); } auto ca2_handler() { return m_ca2_handler.bind(); } auto cb1_handler() { return m_cb1_handler.bind(); } auto cb2_handler() { return m_cb2_handler.bind(); } auto irq_handler() { return m_irq_handler.bind(); } virtual void map(address_map &map); u8 read(offs_t offset); void write(offs_t offset, u8 data); DECLARE_WRITE_LINE_MEMBER( write_pa0 ) { set_pa_line(0, state); } DECLARE_WRITE_LINE_MEMBER( write_pa1 ) { set_pa_line(1, state); } DECLARE_WRITE_LINE_MEMBER( write_pa2 ) { set_pa_line(2, state); } DECLARE_WRITE_LINE_MEMBER( write_pa3 ) { set_pa_line(3, state); } DECLARE_WRITE_LINE_MEMBER( write_pa4 ) { set_pa_line(4, state); } DECLARE_WRITE_LINE_MEMBER( write_pa5 ) { set_pa_line(5, state); } DECLARE_WRITE_LINE_MEMBER( write_pa6 ) { set_pa_line(6, state); } DECLARE_WRITE_LINE_MEMBER( write_pa7 ) { set_pa_line(7, state); } void write_pa( u8 data ); DECLARE_WRITE_LINE_MEMBER( write_ca1 ); DECLARE_WRITE_LINE_MEMBER( write_ca2 ); DECLARE_WRITE_LINE_MEMBER( write_pb0 ) { set_pb_line(0, state); } DECLARE_WRITE_LINE_MEMBER( write_pb1 ) { set_pb_line(1, state); } DECLARE_WRITE_LINE_MEMBER( write_pb2 ) { set_pb_line(2, state); } DECLARE_WRITE_LINE_MEMBER( write_pb3 ) { set_pb_line(3, state); } DECLARE_WRITE_LINE_MEMBER( write_pb4 ) { set_pb_line(4, state); } DECLARE_WRITE_LINE_MEMBER( write_pb5 ) { set_pb_line(5, state); } DECLARE_WRITE_LINE_MEMBER( write_pb6 ) { set_pb_line(6, state); } DECLARE_WRITE_LINE_MEMBER( write_pb7 ) { set_pb_line(7, state); } void write_pb( u8 data ); DECLARE_WRITE_LINE_MEMBER( write_cb1 ); DECLARE_WRITE_LINE_MEMBER( write_cb2 ); protected: // device-level overrides virtual void device_start() override; virtual void device_reset() override; virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override; private: static constexpr device_timer_id TIMER_SHIFT = 0; static constexpr device_timer_id TIMER_T1 = 1; static constexpr device_timer_id TIMER_T2 = 2; static constexpr device_timer_id TIMER_CA2 = 3; static constexpr device_timer_id TIMER_SHIFT_IRQ = 4; uint16_t get_counter1_value(); void counter2_decrement(); void set_int(int data); void clear_int(int data); void shift_out(); void shift_in(); void set_pa_line(int line, int state); void set_pb_line(int line, int state); uint8_t input_pa(); void output_pa(); uint8_t input_pb(); void output_pb(); void output_irq(); // TODO: REMOVE THESE devcb_read8 m_in_a_handler; devcb_read8 m_in_b_handler; // TODO: CONVERT THESE TO WRITE LINE devcb_write8 m_out_a_handler; devcb_write8 m_out_b_handler; devcb_write_line m_ca2_handler; devcb_write_line m_cb1_handler; devcb_write_line m_cb2_handler; devcb_write_line m_irq_handler; uint8_t m_in_a; int m_in_ca1; int m_in_ca2; uint8_t m_out_a; int m_out_ca2; uint8_t m_ddr_a; uint8_t m_latch_a; uint8_t m_in_b; int m_in_cb1; int m_in_cb2; uint8_t m_out_b; int m_out_cb1; int m_out_cb2; uint8_t m_ddr_b; uint8_t m_latch_b; uint8_t m_t1cl; uint8_t m_t1ch; uint8_t m_t1ll; uint8_t m_t1lh; uint8_t m_t2cl; uint8_t m_t2ch; uint8_t m_t2ll; uint8_t m_t2lh; uint8_t m_sr; uint8_t m_pcr; uint8_t m_acr; uint8_t m_ier; uint8_t m_ifr; emu_timer *m_t1; attotime m_time1; uint8_t m_t1_active; int m_t1_pb7; emu_timer *m_t2; attotime m_time2; uint8_t m_t2_active; emu_timer *m_ca2_timer; emu_timer *m_shift_timer; emu_timer *m_shift_irq_timer; uint8_t m_shift_counter; }; // device type definition DECLARE_DEVICE_TYPE(VIA6522, via6522_device) #endif // MAME_MACHINE_6522VIA_H