// license:BSD-3-Clause // copyright-holders:Aaron Giles, Nathan Woods /********************************************************************** Motorola 6821 PIA interface and emulation Notes: * get_port_b_z_mask() gives the caller the bitmask that shows which bits are high-impedance when reading port B, and thus neither 0 or 1. get_output_cb2_z() returns the same info for the CB2 pin. * set_port_a_z_mask allows the input callback to indicate which port A bits are disconnected. For these bits, the read operation will return the output buffer's contents. * The 'alt' interface functions are used when the A0 and A1 address bits are swapped. * All 'int' data or return values are bool, and should be converted to bool at some point. **********************************************************************/ #ifndef MAME_DEVICES_MACHINE_6821PIA_H #define MAME_DEVICES_MACHINE_6821PIA_H #pragma once /*************************************************************************** DEVICE CONFIGURATION MACROS ***************************************************************************/ // TODO: REMOVE THESE #define MCFG_PIA_READPA_HANDLER(_devcb) \ downcast(*device).set_readpa_handler(DEVCB_##_devcb); #define MCFG_PIA_READPB_HANDLER(_devcb) \ downcast(*device).set_readpb_handler(DEVCB_##_devcb); #define MCFG_PIA_READCA1_HANDLER(_devcb) \ downcast(*device).set_readca1_handler(DEVCB_##_devcb); #define MCFG_PIA_READCA2_HANDLER(_devcb) \ downcast(*device).set_readca2_handler(DEVCB_##_devcb); #define MCFG_PIA_READCB1_HANDLER(_devcb) \ downcast(*device).set_readcb1_handler(DEVCB_##_devcb); // TODO: CONVERT THESE TO WRITE LINE #define MCFG_PIA_WRITEPA_HANDLER(_devcb) \ downcast(*device).set_writepa_handler(DEVCB_##_devcb); #define MCFG_PIA_WRITEPB_HANDLER(_devcb) \ downcast(*device).set_writepb_handler(DEVCB_##_devcb); #define MCFG_PIA_CA2_HANDLER(_devcb) \ downcast(*device).set_ca2_handler(DEVCB_##_devcb); #define MCFG_PIA_CB2_HANDLER(_devcb) \ downcast(*device).set_cb2_handler(DEVCB_##_devcb); #define MCFG_PIA_IRQA_HANDLER(_devcb) \ downcast(*device).set_irqa_handler(DEVCB_##_devcb); #define MCFG_PIA_IRQB_HANDLER(_devcb) \ downcast(*device).set_irqb_handler(DEVCB_##_devcb); /*************************************************************************** TYPE DEFINITIONS ***************************************************************************/ // ======================> pia6821_device class pia6821_device : public device_t { public: // construction/destruction pia6821_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0); // static configuration helpers // TODO: REMOVE THESE template devcb_base &set_readpa_handler(Obj &&object) { return m_in_a_handler.set_callback(std::forward(object)); } template devcb_base &set_readpb_handler(Obj &&object) { return m_in_b_handler.set_callback(std::forward(object)); } template devcb_base &set_readca1_handler(Obj &&object) { return m_in_ca1_handler.set_callback(std::forward(object)); } template devcb_base &set_readca2_handler(Obj &&object) { return m_in_ca2_handler.set_callback(std::forward(object)); } template devcb_base &set_readcb1_handler(Obj &&object) { return m_in_cb1_handler.set_callback(std::forward(object)); } auto readpa_handler() { return m_in_a_handler.bind(); } auto readpb_handler() { return m_in_b_handler.bind(); } auto readca1_handler() { return m_in_ca1_handler.bind(); } auto readca2_handler() { return m_in_ca2_handler.bind(); } auto readcb1_handler() { return m_in_cb1_handler.bind(); } // TODO: CONVERT THESE TO WRITE LINE template devcb_base &set_writepa_handler(Obj &&object) { return m_out_a_handler.set_callback(std::forward(object)); } template devcb_base &set_writepb_handler(Obj &&object) { return m_out_b_handler.set_callback(std::forward(object)); } auto writepa_handler() { return m_out_a_handler.bind(); } auto writepb_handler() { return m_out_b_handler.bind(); } template devcb_base &set_ca2_handler(Obj &&object) { return m_ca2_handler.set_callback(std::forward(object)); } template devcb_base &set_cb2_handler(Obj &&object) { return m_cb2_handler.set_callback(std::forward(object)); } template devcb_base &set_irqa_handler(Obj &&object) { return m_irqa_handler.set_callback(std::forward(object)); } template devcb_base &set_irqb_handler(Obj &&object) { return m_irqb_handler.set_callback(std::forward(object)); } auto ca2_handler() { return m_ca2_handler.bind(); } auto cb2_handler() { return m_cb2_handler.bind(); } auto irqa_handler() { return m_irqa_handler.bind(); } auto irqb_handler() { return m_irqb_handler.bind(); } uint8_t reg_r(uint8_t offset); void reg_w(uint8_t offset, uint8_t data); DECLARE_READ8_MEMBER( read ) { return reg_r(offset); } DECLARE_WRITE8_MEMBER( write ) { reg_w(offset, data); } DECLARE_READ8_MEMBER( read_alt ) { return reg_r(((offset << 1) & 0x02) | ((offset >> 1) & 0x01)); } DECLARE_WRITE8_MEMBER( write_alt ) { reg_w(((offset << 1) & 0x02) | ((offset >> 1) & 0x01), data); } uint8_t port_b_z_mask() const { return ~m_ddr_b; } // see first note in .c void set_port_a_z_mask(uint8_t data) { m_port_a_z_mask = data; }// see second note in .c DECLARE_WRITE8_MEMBER( porta_w ) { write_porta(data); } void write_porta(uint8_t data); void set_a_input(uint8_t data, uint8_t z_mask); uint8_t a_output(); DECLARE_WRITE_LINE_MEMBER( ca1_w ); DECLARE_WRITE_LINE_MEMBER( ca2_w ); bool ca2_output(); bool ca2_output_z(); DECLARE_WRITE8_MEMBER( portb_w ) { write_portb(data); } void write_portb(uint8_t data); uint8_t b_output(); DECLARE_WRITE_LINE_MEMBER( cb1_w ); DECLARE_WRITE_LINE_MEMBER( cb2_w ); bool cb2_output(); bool cb2_output_z(); int irq_a_state() const { return m_irq_a_state; } int irq_b_state() const { return m_irq_b_state; } protected: // device-level overrides virtual void device_start() override; virtual void device_reset() override; private: void update_interrupts(); uint8_t get_in_a_value(); uint8_t get_in_b_value(); uint8_t get_out_a_value(); uint8_t get_out_b_value(); void set_out_ca2(int data); void set_out_cb2(int data); uint8_t port_a_r(); uint8_t ddr_a_r(); uint8_t control_a_r(); uint8_t port_b_r(); uint8_t ddr_b_r(); uint8_t control_b_r(); void send_to_out_a_func(const char* message); void send_to_out_b_func(const char* message); void port_a_w(uint8_t data); void ddr_a_w(uint8_t data); void port_b_w(uint8_t data); void ddr_b_w(uint8_t data); void control_a_w(uint8_t data); void control_b_w(uint8_t data); static bool irq1_enabled(uint8_t c); static bool c1_low_to_high(uint8_t c); static bool c1_high_to_low(uint8_t c); static bool output_selected(uint8_t c); static bool irq2_enabled(uint8_t c); static bool strobe_e_reset(uint8_t c); static bool strobe_c1_reset(uint8_t c); static bool c2_set(uint8_t c); static bool c2_low_to_high(uint8_t c); static bool c2_high_to_low(uint8_t c); static bool c2_set_mode(uint8_t c); static bool c2_strobe_mode(uint8_t c); static bool c2_output(uint8_t c); static bool c2_input(uint8_t c); devcb_read8 m_in_a_handler; devcb_read8 m_in_b_handler; devcb_read_line m_in_ca1_handler; devcb_read_line m_in_cb1_handler; devcb_read_line m_in_ca2_handler; devcb_write8 m_out_a_handler; devcb_write8 m_out_b_handler; devcb_write_line m_ca2_handler; devcb_write_line m_cb2_handler; devcb_write_line m_irqa_handler; devcb_write_line m_irqb_handler; uint8_t m_in_a; uint8_t m_in_ca1; uint8_t m_in_ca2; uint8_t m_out_a; uint8_t m_out_ca2; uint8_t m_port_a_z_mask; uint8_t m_ddr_a; uint8_t m_ctl_a; uint8_t m_irq_a1; uint8_t m_irq_a2; uint8_t m_irq_a_state; uint8_t m_in_b; uint8_t m_in_cb1; uint8_t m_in_cb2; uint8_t m_out_b; uint8_t m_out_cb2; uint8_t m_last_out_cb2_z; uint8_t m_ddr_b; uint8_t m_ctl_b; uint8_t m_irq_b1; uint8_t m_irq_b2; uint8_t m_irq_b_state; // variables that indicate if access a line externally - // used to for logging purposes ONLY bool m_in_a_pushed; bool m_out_a_needs_pulled; bool m_in_ca1_pushed; bool m_in_ca2_pushed; bool m_out_ca2_needs_pulled; bool m_in_b_pushed; bool m_out_b_needs_pulled; bool m_in_cb1_pushed; bool m_in_cb2_pushed; bool m_out_cb2_needs_pulled; bool m_logged_port_a_not_connected; bool m_logged_port_b_not_connected; bool m_logged_ca1_not_connected; bool m_logged_ca2_not_connected; bool m_logged_cb1_not_connected; bool m_logged_cb2_not_connected; }; // device type definition DECLARE_DEVICE_TYPE(PIA6821, pia6821_device) #endif // MAME_DEVICES_MACHINE_6821PIA_H