mirror of
https://github.com/holub/mame
synced 2025-10-04 16:34:53 +03:00
0d2d4cab4f
device_rtc_interface: Cleanups and refinements (nw) - Give RTCs their own phase of machine initialization, right after NVRAM loading - Make RTC feature flag overrides const, including one new one - Make rtc_clock_updated a required override
97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
// license:BSD-3-Clause
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// copyright-holders:Curt Coder
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/**********************************************************************
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Dallas DS1302 Trickle-Charge Timekeeping Chip emulation
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**********************************************************************
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_____ _____
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Vcc2 1 |* \_/ | 8 Vcc1
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X1 2 | | 7 SCLK
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X2 3 | | 6 I/O
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GND 4 |_____________| 5 CE
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**********************************************************************/
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#pragma once
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#ifndef __DS1302_H__
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#define __DS1302_H__
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#include "dirtc.h"
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//**************************************************************************
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// INTERFACE CONFIGURATION MACROS
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//**************************************************************************
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#define MCFG_DS1302_ADD(_tag, _clock) \
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MCFG_DEVICE_ADD(_tag, DS1302, _clock)
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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// ======================> ds1302_device
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class ds1302_device : public device_t,
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public device_rtc_interface,
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public device_nvram_interface
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{
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public:
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// construction/destruction
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ds1302_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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DECLARE_WRITE_LINE_MEMBER( ce_w );
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DECLARE_WRITE_LINE_MEMBER( sclk_w );
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DECLARE_WRITE_LINE_MEMBER( io_w );
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DECLARE_READ_LINE_MEMBER( io_r );
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protected:
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// device-level overrides
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virtual void device_start() override;
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virtual void device_reset() override;
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virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
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// device_nvram_interface overrides
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virtual void nvram_default() override;
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virtual void nvram_read(emu_file &file) override;
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virtual void nvram_write(emu_file &file) override;
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// device_rtc_interface overrides
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virtual void rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second) override;
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virtual bool rtc_feature_leap_year() const override { return true; }
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private:
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void load_shift_register();
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void input_bit();
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void output_bit();
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int m_ce;
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int m_clk;
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int m_io;
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int m_state;
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int m_bits;
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UINT8 m_cmd;
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UINT8 m_data;
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int m_addr;
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UINT8 m_reg[9];
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UINT8 m_user[9];
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UINT8 m_ram[0x20];
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// timers
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emu_timer *m_clock_timer;
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};
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// device type definition
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extern const device_type DS1302;
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#endif
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