// license:BSD-3-Clause // copyright-holders:smf /********************************************************************* 6850acia.h 6850 ACIA code *********************************************************************/ #ifndef MAME_MACHINE_6850ACIA_H #define MAME_MACHINE_6850ACIA_H #pragma once class acia6850_device : public device_t { public: // construction/destruction acia6850_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0); auto txd_handler() { return m_txd_handler.bind(); } auto rts_handler() { return m_rts_handler.bind(); } auto irq_handler() { return m_irq_handler.bind(); } void control_w(uint8_t data); uint8_t status_r(); void data_w(uint8_t data); uint8_t data_r(); void write(offs_t offset, uint8_t data); uint8_t read(offs_t offset); DECLARE_WRITE_LINE_MEMBER( write_cts ); DECLARE_WRITE_LINE_MEMBER( write_dcd ); DECLARE_WRITE_LINE_MEMBER( write_rxd ); DECLARE_WRITE_LINE_MEMBER( write_rxc ); DECLARE_WRITE_LINE_MEMBER( write_txc ); protected: acia6850_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock); // device-level overrides virtual void device_start() override; virtual void device_reset() override; virtual void update_irq(); int calculate_txirq(); int calculate_rxirq(); private: void output_txd(int txd); void output_rts(int txd); void output_irq(int irq); TIMER_CALLBACK_MEMBER(delayed_output_irq); enum { SR_RDRF = 0x01, SR_TDRE = 0x02, SR_DCD = 0x04, SR_CTS = 0x08, SR_FE = 0x10, SR_OVRN = 0x20, SR_PE = 0x40, SR_IRQ = 0x80 }; enum serial_state { STATE_START, STATE_DATA, STATE_STOP }; enum parity_type { PARITY_NONE, PARITY_ODD, PARITY_EVEN }; enum dcd_irq_state { DCD_IRQ_NONE = 0, DCD_IRQ_READ_DATA, DCD_IRQ_READ_STATUS }; devcb_write_line m_txd_handler; devcb_write_line m_rts_handler; devcb_write_line m_irq_handler; uint8_t m_status; uint8_t m_tdr; uint8_t m_rdr; bool m_first_master_reset; int m_dcd_irq_pending; bool m_overrun_pending; int m_divide; int m_bits; int m_stopbits; int m_parity; int m_brk; int m_rts; int m_dcd; int m_irq; int m_txc; int m_txd; int m_tx_state; int m_tx_bits; int m_tx_shift; int m_tx_parity; int m_tx_counter; int m_tx_irq_enable; int m_rxc; int m_rxd; int m_rx_state; int m_rx_bits; int m_rx_shift; int m_rx_parity; int m_rx_counter; int m_rx_irq_enable; static const int counter_divide_select[4]; static const int word_select[8][3]; static const int transmitter_control[4][3]; }; // device type definition DECLARE_DEVICE_TYPE(ACIA6850, acia6850_device) #endif // MAME_MACHINE_6850ACIA_H