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// license:BSD-3-Clause
// copyright-holders:Tim Schuerewegen
/*********************************************************************
Philips PCF8593 CMOS clock/calendar circuit
(c) 2001-2007 Tim Schuerewegen
*********************************************************************/
#ifndef MAME_MACHINE_PCF8593_H
#define MAME_MACHINE_PCF8593_H
#pragma once
#include "dirtc.h"
// ======================> pcf8593_device
class pcf8593_device : public device_t,
public device_rtc_interface,
public device_nvram_interface
{
public:
pcf8593_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
void scl_w(int state);
void sda_w(int state);
int sda_r();
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// device_rtc_interface overrides
virtual bool rtc_feature_y2k() 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;
// device_nvram_interface overrides
virtual void nvram_default() override;
virtual bool nvram_read(util::read_stream &file) override;
virtual bool nvram_write(util::write_stream &file) override;
TIMER_CALLBACK_MEMBER(clock_tick);
private:
void clear_buffer_rx();
// internal state
uint8_t m_data[16];
int m_pin_scl;
int m_pin_sda;
int m_inp;
int m_active;
int m_bits;
uint8_t m_data_recv_index;
uint8_t m_data_recv[50];
uint8_t m_mode;
uint8_t m_pos;
emu_timer * m_timer;
enum { RTC_MODE_NONE, RTC_MODE_SEND, RTC_MODE_RECV };
};
// device type definition
DECLARE_DEVICE_TYPE(PCF8593, pcf8593_device)
#endif // MAME_MACHINE_PCF8593_H
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