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// license:BSD-3-Clause
// copyright-holders:Michael Zapf
/*
Texas Instruments/Benchmarq BQ4847 Real-time clock
See bq4847.cpp for details.
Michael Zapf, April 2020
*/
#ifndef MAME_MACHINE_BQ4847_H
#define MAME_MACHINE_BQ4847_H
#pragma once
#include "dirtc.h"
// ======================> bq4874_device
class bq4847_device : public device_t,
public device_nvram_interface,
public device_rtc_interface
{
public:
bq4847_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// The watchdog is inactive when the pin is not connected; we offer
// a method to activate it
void set_watchdog_active(bool active);
auto interrupt_cb() { return m_interrupt_cb.bind(); }
auto watchdog_cb() { return m_wdout_cb.bind(); }
// Retrigger the watchdog
void retrigger_watchdog();
uint8_t read(offs_t address);
void write(offs_t address, uint8_t data);
DECLARE_READ_LINE_MEMBER(intrq_r);
// Mainly used to disconnect from oscillator
void connect_osc(bool conn);
private:
// Inherited from device_rtc_interface
void rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second) override;
bool rtc_feature_y2k() const override { return false; }
bool rtc_feature_leap_year() const override { return true; }
bool rtc_battery_backed() const override { return true; }
// callback called when interrupt pin state changes (may be nullptr)
devcb_write_line m_interrupt_cb;
// callback called when watchdog times out changes (may be nullptr)
devcb_write_line m_wdout_cb;
// Accessible registers
uint8_t m_reg[16];
// Internal clock registers
// The clock operates on these registers and copies them to the
// accessible registers
uint8_t m_intreg[16];
TIMER_CALLBACK_MEMBER(rtc_clock_cb);
TIMER_CALLBACK_MEMBER(rtc_periodic_cb);
TIMER_CALLBACK_MEMBER(rtc_watchdog_cb);
void nvram_default() override;
void nvram_read(emu_file &file) override;
void nvram_write(emu_file &file) override;
void device_start() override;
// Sanity-check BCD number
bool valid_bcd(uint8_t value, uint8_t min, uint8_t max);
// Check bits in register
bool is_set(int number, uint8_t flag);
// Increment BCD number
bool increment_bcd(uint8_t& bcdnumber, uint8_t limit, uint8_t min);
// Set/Reset one or more bits in the register
void set_register(int number, uint8_t bits, bool set);
// Copy register contents from the internal registers to SRAM
void transfer_to_access();
// Check matching registers of time and alarm
bool check_match(int regint, int regalarm);
// Check whether this register is internal
bool is_internal_register(int regnum);
// Advance
bool advance_hours_bcd();
void advance_days_bcd();
// Timers
emu_timer *m_clock_timer;
emu_timer *m_periodic_timer;
emu_timer *m_watchdog_timer;
// Set timers
void set_periodic_timer();
void set_watchdog_timer(bool on);
// Get time from system
void get_system_time();
// Get the delay until the next second
int get_delay();
// Flags
bool m_watchdog_active;
bool m_watchdog_asserted;
bool m_writing;
};
DECLARE_DEVICE_TYPE(BQ4847, bq4847_device)
#endif
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