1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
// 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"
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);
auto wdo_handler() { return m_wdo_handler.bind(); }
auto int_handler() { return m_int_handler.bind(); }
auto rst_handler() { return m_rst_handler.bind(); }
uint8_t read(offs_t address);
void write(offs_t address, uint8_t data);
DECLARE_WRITE_LINE_MEMBER(write_wdi); // watchdog disabled if wdi pin is left floating
protected:
bq4847_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock = 32768);
// device_t
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_clock_changed() override;
// device_nvram_interface
virtual void nvram_default() override;
virtual bool nvram_read(util::read_stream& file) override;
virtual bool nvram_write(util::write_stream& file) override;
// device_rtc_interface
virtual bool rtc_feature_y2k() const override { return false; }
virtual bool rtc_feature_leap_year() const override { return true; }
virtual bool rtc_battery_backed() const override { return true; }
virtual void rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second) override;
private:
optional_memory_region m_region;
devcb_write_line m_wdo_handler;
devcb_write_line m_int_handler;
devcb_write_line m_rst_handler;
TIMER_CALLBACK_MEMBER(update_callback);
TIMER_CALLBACK_MEMBER(periodic_callback);
TIMER_CALLBACK_MEMBER(watchdog_callback);
bool increment_bcd(uint8_t& bcdnumber, uint8_t limit, uint8_t min);
bool check_alarm(int now, int alarm);
bool is_clock_register(int regnum);
bool advance_hours_bcd();
void advance_days_bcd();
void update_int();
void set_wdo(int state);
emu_timer *m_update_timer;
emu_timer *m_periodic_timer;
emu_timer *m_watchdog_timer;
void set_periodic_timer();
void set_watchdog_timer(int rst_state = 1);
uint8_t m_userbuffer[16];
uint8_t m_register[16];
int m_wdo_state;
int m_int_state;
int m_rst_state;
int m_wdi_state;
bool m_writing;
};
class bq4845_device : public bq4847_device
{
public:
bq4845_device(const machine_config& mconfig, const char* tag, device_t* owner, uint32_t clock);
};
DECLARE_DEVICE_TYPE(BQ4845, bq4845_device)
DECLARE_DEVICE_TYPE(BQ4847, bq4847_device)
#endif
|