// license:BSD-3-Clause // copyright-holders:smf /********************************************************************* i8251.h Intel 8251 Universal Synchronous/Asynchronous Receiver Transmitter code *********************************************************************/ #ifndef __I8251_H__ #define __I8251_H__ //************************************************************************** // INTERFACE CONFIGURATION MACROS //************************************************************************** #define MCFG_I8251_TXD_HANDLER(_devcb) \ devcb = &i8251_device::set_txd_handler(*device, DEVCB_##_devcb); #define MCFG_I8251_DTR_HANDLER(_devcb) \ devcb = &i8251_device::set_dtr_handler(*device, DEVCB_##_devcb); #define MCFG_I8251_RTS_HANDLER(_devcb) \ devcb = &i8251_device::set_rts_handler(*device, DEVCB_##_devcb); #define MCFG_I8251_RXRDY_HANDLER(_devcb) \ devcb = &i8251_device::set_rxrdy_handler(*device, DEVCB_##_devcb); #define MCFG_I8251_TXRDY_HANDLER(_devcb) \ devcb = &i8251_device::set_txrdy_handler(*device, DEVCB_##_devcb); #define MCFG_I8251_TXEMPTY_HANDLER(_devcb) \ devcb = &i8251_device::set_txempty_handler(*device, DEVCB_##_devcb); #define MCFG_I8251_SYNDET_HANDLER(_devcb) \ devcb = &i8251_device::set_syndet_handler(*device, DEVCB_##_devcb); class i8251_device : public device_t, public device_serial_interface { public: // construction/destruction i8251_device(const machine_config &mconfig, device_type type, std::string name, std::string tag, device_t *owner, UINT32 clock, std::string shortname); i8251_device(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock); // static configuration helpers template static devcb_base &set_txd_handler(device_t &device, _Object object) { return downcast(device).m_txd_handler.set_callback(object); } template static devcb_base &set_dtr_handler(device_t &device, _Object object) { return downcast(device).m_dtr_handler.set_callback(object); } template static devcb_base &set_rts_handler(device_t &device, _Object object) { return downcast(device).m_rts_handler.set_callback(object); } template static devcb_base &set_rxrdy_handler(device_t &device, _Object object) { return downcast(device).m_rxrdy_handler.set_callback(object); } template static devcb_base &set_txrdy_handler(device_t &device, _Object object) { return downcast(device).m_txrdy_handler.set_callback(object); } template static devcb_base &set_txempty_handler(device_t &device, _Object object) { return downcast(device).m_txempty_handler.set_callback(object); } template static devcb_base &set_syndet_handler(device_t &device, _Object object) { return downcast(device).m_syndet_handler.set_callback(object); } DECLARE_READ8_MEMBER(data_r); DECLARE_WRITE8_MEMBER(data_w); DECLARE_READ8_MEMBER(status_r); DECLARE_WRITE8_MEMBER(control_w); DECLARE_WRITE8_MEMBER(command_w); DECLARE_WRITE8_MEMBER(mode_w); DECLARE_WRITE_LINE_MEMBER( write_rxd ); DECLARE_WRITE_LINE_MEMBER( write_cts ); DECLARE_WRITE_LINE_MEMBER( write_dsr ); DECLARE_WRITE_LINE_MEMBER( write_txc ); DECLARE_WRITE_LINE_MEMBER( write_rxc ); /// TODO: REMOVE THIS void receive_character(UINT8 ch); /// TODO: this shouldn't be public enum { I8251_STATUS_FRAMING_ERROR = 0x20, I8251_STATUS_OVERRUN_ERROR = 0x10, I8251_STATUS_PARITY_ERROR = 0x08, I8251_STATUS_TX_EMPTY = 0x04, I8251_STATUS_RX_READY = 0x02, I8251_STATUS_TX_READY = 0x01 }; 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; void update_rx_ready(); void update_tx_ready(); void update_tx_empty(); void transmit_clock(); void receive_clock(); bool is_tx_enabled(void) const; void check_for_tx_start(void); void start_tx(void); enum { I8251_EXPECTING_MODE = 0x01, I8251_EXPECTING_SYNC_BYTE = 0x02, I8251_DELAYED_TX_EN = 0x04 }; private: devcb_write_line m_txd_handler; devcb_write_line m_dtr_handler; devcb_write_line m_rts_handler; devcb_write_line m_rxrdy_handler; devcb_write_line m_txrdy_handler; devcb_write_line m_txempty_handler; devcb_write_line m_syndet_handler; /* flags controlling how i8251_control_w operates */ UINT8 m_flags; /* offset into sync_bytes used during sync byte transfer */ UINT8 m_sync_byte_offset; /* number of sync bytes written so far */ UINT8 m_sync_byte_count; /* the sync bytes written */ UINT8 m_sync_bytes[2]; /* status of i8251 */ UINT8 m_status; UINT8 m_command; /* mode byte - bit definitions depend on mode - e.g. synchronous, asynchronous */ UINT8 m_mode_byte; int m_cts; int m_dsr; int m_rxd; int m_rxc; int m_txc; int m_rxc_count; int m_txc_count; int m_br_factor; /* data being received */ UINT8 m_rx_data; /* tx buffer */ UINT8 m_tx_data; }; class v53_scu_device : public i8251_device { public: // construction/destruction v53_scu_device(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock); }; // device type definition extern const device_type I8251; extern const device_type V53_SCU; #endif /* __I8251_H__ */