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// license:BSD-3-Clause
// copyright-holders:F. Ulivi
/*********************************************************************
hp_taco.h
HP TApe COntroller (5006-3012)
*********************************************************************/
#ifndef MAME_MACHINE_HP_TACO_H
#define MAME_MACHINE_HP_TACO_H
#pragma once
#include "formats/hti_tape.h"
#include "machine/hp_dc100_tape.h"
class hp_taco_device : public device_t
{
public:
// construction/destruction
hp_taco_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// configuration helpers
auto irq() { return m_irq_handler.bind(); }
auto flg() { return m_flg_handler.bind(); }
auto sts() { return m_sts_handler.bind(); }
// Set unit name
void set_name(const std::string& name);
// Register read/write
void reg_w(offs_t offset, uint16_t data);
uint16_t reg_r(offs_t offset);
// Flag & status read
int flg_r();
int sts_r();
void cart_out_w(int state);
void hole_w(int state);
void tacho_tick_w(int state);
void motion_w(int state);
void rd_bit_w(int state);
int wr_bit_r();
protected:
hp_taco_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
// device-level overrides
virtual void device_add_mconfig(machine_config &config) override;
virtual void device_start() override;
virtual void device_reset() override;
TIMER_CALLBACK_MEMBER(gap_timer_tick);
TIMER_CALLBACK_MEMBER(evd_timer_tick);
TIMER_CALLBACK_MEMBER(error_timer_tick);
private:
required_device<hp_dc100_tape_device> m_tape;
devcb_write_line m_irq_handler;
devcb_write_line m_flg_handler;
devcb_write_line m_sts_handler;
// Registers
uint16_t m_data_reg;
uint16_t m_cmd_reg;
uint16_t m_status_reg;
uint16_t m_tach_reg;
uint16_t m_checksum_reg;
uint16_t m_threshold_reg;
// State
bool m_irq;
bool m_flg;
bool m_sts;
bool m_error;
bool m_gap_in_read;
// Command FSM state
typedef enum {
CMD_IDLE,
CMD_PH0,
CMD_PH1,
CMD_PH2,
CMD_STOPPING
} cmd_state_t;
cmd_state_t m_cmd_state;
// Timers
emu_timer *m_gap_timer;
emu_timer *m_evd_timer;
emu_timer *m_error_timer;
// Reading & writing
uint16_t m_working_reg;
unsigned m_bit_idx;
void clear_state();
void irq_w(bool state);
void sts_w(bool state);
void set_error(bool error , bool gap_in_read);
hti_format_t::tape_pos_t min_gap_size() const;
void set_gap_timer();
void set_evd_timer();
void set_tape_present(bool present);
void send_go();
void send_stop();
void end_cmd();
void irq_and_end();
bool is_at_slow_speed() const;
void start_rd();
void start_wr();
bool adv_bit_idx();
void update_checksum(uint16_t data);
void cmd_fsm();
static uint8_t get_cmd(uint16_t cmd_reg);
static bool is_cmd_rd_wr(uint16_t cmd_reg);
static bool is_cmd_rd(uint16_t cmd_reg);
static bool is_cmd_wr(uint16_t cmd_reg);
static bool is_double_hole_cmd(uint16_t cmd_reg);
void start_cmd_exec(uint16_t new_cmd_reg);
};
// device type definition
DECLARE_DEVICE_TYPE(HP_TACO, hp_taco_device)
#endif // MAME_MACHINE_HP_TACO_H
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