// license:BSD-3-Clause // copyright-holders:Mariusz Wojcieszek, R. Belmont #ifndef _MC68681_H #define _MC68681_H #define MCFG_MC68681_ADD(_tag, _clock) \ MCFG_DEVICE_ADD(_tag, MC68681, _clock) #define MCFG_MC68681_REPLACE(_tag, _clock) \ MCFG_DEVICE_REPLACE(_tag, MC68681, _clock) #define MCFG_MC68681_IRQ_CALLBACK(_cb) \ devcb = &mc68681_device::set_irq_cb(*device, DEVCB_##_cb); #define MCFG_MC68681_A_TX_CALLBACK(_cb) \ devcb = &mc68681_device::set_a_tx_cb(*device, DEVCB_##_cb); #define MCFG_MC68681_B_TX_CALLBACK(_cb) \ devcb = &mc68681_device::set_b_tx_cb(*device, DEVCB_##_cb); // deprecated: use ipX_w() instead #define MCFG_MC68681_INPORT_CALLBACK(_cb) \ devcb = &mc68681_device::set_inport_cb(*device, DEVCB_##_cb); #define MCFG_MC68681_OUTPORT_CALLBACK(_cb) \ devcb = &mc68681_device::set_outport_cb(*device, DEVCB_##_cb); #define MCFG_MC68681_SET_EXTERNAL_CLOCKS(_a, _b, _c, _d) \ mc68681_device::static_set_clocks(*device, _a, _b, _c, _d); #define MC68681_RX_FIFO_SIZE 3 // forward declaration class mc68681_device; // mc68681_channel class class mc68681_channel : public device_t, public device_serial_interface { public: mc68681_channel(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock); // 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; // device_serial overrides virtual void rcv_complete() override; // Rx completed receiving byte virtual void tra_complete() override; // Tx completed sending byte virtual void tra_callback() override; // Tx send bit UINT8 read_chan_reg(int reg); void write_chan_reg(int reg, UINT8 data); void update_interrupts(); UINT8 read_rx_fifo(); void ACR_updated(); UINT8 get_chan_CSR(); private: /* Registers */ UINT8 CR; /* Command register */ UINT8 CSR; /* Clock select register */ UINT8 MR1; /* Mode register 1 */ UINT8 MR2; /* Mode register 2 */ UINT8 MR_ptr; /* Mode register pointer */ UINT8 SR; /* Status register */ /* State */ int tx_baud_rate, rx_baud_rate; /* Receiver */ UINT8 rx_enabled; UINT8 rx_fifo[MC68681_RX_FIFO_SIZE]; int rx_fifo_read_ptr; int rx_fifo_write_ptr; int rx_fifo_num; int m_ch; /* Transmitter */ UINT8 tx_enabled; UINT8 tx_data; UINT8 tx_ready; mc68681_device *m_uart; void write_MR(UINT8 data); void write_CR(UINT8 data); void write_TX(UINT8 data); void recalc_framing(); }; class mc68681_device : public device_t { friend class mc68681_channel; public: mc68681_device(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock); required_device m_chanA; required_device m_chanB; // inline configuration helpers static void static_set_clocks(device_t &device, int clk3, int clk4, int clk5, int clk6); // API DECLARE_READ8_MEMBER(read); DECLARE_WRITE8_MEMBER(write); UINT8 get_irq_vector() { m_read_vector = true; return IVR; } DECLARE_WRITE_LINE_MEMBER( rx_a_w ) { m_chanA->device_serial_interface::rx_w((UINT8)state); } DECLARE_WRITE_LINE_MEMBER( rx_b_w ) { m_chanB->device_serial_interface::rx_w((UINT8)state); } template static devcb_base &set_irq_cb(device_t &device, _Object object) { return downcast(device).write_irq.set_callback(object); } template static devcb_base &set_a_tx_cb(device_t &device, _Object object) { return downcast(device).write_a_tx.set_callback(object); } template static devcb_base &set_b_tx_cb(device_t &device, _Object object) { return downcast(device).write_b_tx.set_callback(object); } template static devcb_base &set_inport_cb(device_t &device, _Object object) { return downcast(device).read_inport.set_callback(object); } template static devcb_base &set_outport_cb(device_t &device, _Object object) { return downcast(device).write_outport.set_callback(object); } devcb_write_line write_irq, write_a_tx, write_b_tx; devcb_read8 read_inport; devcb_write8 write_outport; INT32 ip3clk, ip4clk, ip5clk, ip6clk; // new-style push handlers for input port bits DECLARE_WRITE_LINE_MEMBER( ip0_w ); DECLARE_WRITE_LINE_MEMBER( ip1_w ); DECLARE_WRITE_LINE_MEMBER( ip2_w ); DECLARE_WRITE_LINE_MEMBER( ip3_w ); DECLARE_WRITE_LINE_MEMBER( ip4_w ); DECLARE_WRITE_LINE_MEMBER( ip5_w ); protected: // device-level overrides virtual void device_start() override; virtual void device_reset() override; virtual machine_config_constructor device_mconfig_additions() const override; private: TIMER_CALLBACK_MEMBER( duart_timer_callback ); /* registers */ UINT8 ACR; /* Auxiliary Control Register */ UINT8 IMR; /* Interrupt Mask Register */ UINT8 ISR; /* Interrupt Status Register */ UINT8 IVR; /* Interrupt Vector Register */ UINT8 OPCR; /* Output Port Conf. Register */ UINT8 OPR; /* Output Port Register */ PAIR CTR; /* Counter/Timer Preset Value */ UINT8 IPCR; /* Input Port Control Register */ bool m_read_vector; // if this is read and IRQ is active, it counts as pulling IACK /* state */ UINT8 IP_last_state; /* last state of IP bits */ /* timer */ UINT8 half_period; emu_timer *duart_timer; double duart68681_get_ct_rate(); UINT16 duart68681_get_ct_count(); void duart68681_start_ct(int count); int calc_baud(int ch, UINT8 data); int get_ch(mc68681_channel *ch) { return (ch == m_chanA) ? 0 : 1; } void clear_ISR_bits(int mask); void set_ISR_bits(int mask); void update_interrupts(); mc68681_channel *get_channel(int chan); }; extern const device_type MC68681; extern const device_type MC68681_CHANNEL; #endif //_N68681_H