mirror of
https://github.com/holub/mame
synced 2025-05-19 20:29:09 +03:00
466 lines
12 KiB
C
466 lines
12 KiB
C
// license:MAME
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// copyright-holders:Angelo Salese, David Haywood
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/***************************************************************************
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rtc9701.c
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Epson RTC-9701-JE
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Serial Real Time Clock + EEPROM
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***************************************************************************/
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#include "emu.h"
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#include "machine/rtc9701.h"
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//**************************************************************************
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// GLOBAL VARIABLES
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//**************************************************************************
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// device type definition
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const device_type rtc9701 = &device_creator<rtc9701_device>;
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// rtc9701_device - constructor
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//-------------------------------------------------
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rtc9701_device::rtc9701_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: device_t(mconfig, rtc9701, "RTC-9701", tag, owner, clock, "rtc9701", __FILE__),
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device_nvram_interface(mconfig, *this),
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m_latch(0),
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m_reset_line(CLEAR_LINE),
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m_clock_line(CLEAR_LINE)
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{
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}
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void rtc9701_device::timer_callback()
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{
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static const UINT8 dpm[12] = { 0x31, 0x28, 0x31, 0x30, 0x31, 0x30, 0x31, 0x31, 0x30, 0x31, 0x30, 0x31 };
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int dpm_count;
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m_rtc.sec++;
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if((m_rtc.sec & 0x0f) >= 0x0a) { m_rtc.sec+=0x10; m_rtc.sec&=0xf0; }
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if((m_rtc.sec & 0xf0) >= 0x60) { m_rtc.min++; m_rtc.sec = 0; }
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if((m_rtc.min & 0x0f) >= 0x0a) { m_rtc.min+=0x10; m_rtc.min&=0xf0; }
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if((m_rtc.min & 0xf0) >= 0x60) { m_rtc.hour++; m_rtc.min = 0; }
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if((m_rtc.hour & 0x0f) >= 0x0a) { m_rtc.hour+=0x10; m_rtc.hour&=0xf0; }
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if((m_rtc.hour & 0xff) >= 0x24) { m_rtc.day++; m_rtc.wday<<=1; m_rtc.hour = 0; }
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if(m_rtc.wday & 0x80) { m_rtc.wday = 1; }
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if((m_rtc.day & 0x0f) >= 0x0a) { m_rtc.day+=0x10; m_rtc.day&=0xf0; }
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/* TODO: crude leap year support */
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dpm_count = (m_rtc.month & 0xf) + (((m_rtc.month & 0x10) >> 4)*10)-1;
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if(((m_rtc.year % 4) == 0) && m_rtc.month == 2)
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{
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if((m_rtc.day & 0xff) >= dpm[dpm_count]+1+1)
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{ m_rtc.month++; m_rtc.day = 0x01; }
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}
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else if((m_rtc.day & 0xff) >= dpm[dpm_count]+1){ m_rtc.month++; m_rtc.day = 0x01; }
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if((m_rtc.month & 0x0f) >= 0x0a) { m_rtc.month = 0x10; }
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if(m_rtc.month >= 0x13) { m_rtc.year++; m_rtc.month = 1; }
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if((m_rtc.year & 0x0f) >= 0x0a) { m_rtc.year+=0x10; m_rtc.year&=0xf0; }
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if((m_rtc.year & 0xf0) >= 0xa0) { m_rtc.year = 0; } //2000-2099 possible timeframe
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}
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TIMER_CALLBACK( rtc9701_device::rtc_inc_callback )
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{
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reinterpret_cast<rtc9701_device *>(ptr)->timer_callback();
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}
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//-------------------------------------------------
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// device_validity_check - perform validity checks
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// on this device
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//-------------------------------------------------
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void rtc9701_device::device_validity_check(validity_checker &valid) const
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void rtc9701_device::device_start()
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{
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/* let's call the timer callback every second */
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machine().scheduler().timer_pulse(attotime::from_hz(clock() / XTAL_32_768kHz), FUNC(rtc_inc_callback), 0, (void *)this);
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system_time systime;
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machine().base_datetime(systime);
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m_rtc.day = ((systime.local_time.mday / 10)<<4) | ((systime.local_time.mday % 10) & 0xf);
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m_rtc.month = (((systime.local_time.month+1) / 10) << 4) | (((systime.local_time.month+1) % 10) & 0xf);
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m_rtc.wday = 1 << systime.local_time.weekday;
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m_rtc.year = (((systime.local_time.year % 100)/10)<<4) | ((systime.local_time.year % 10) & 0xf);
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m_rtc.hour = ((systime.local_time.hour / 10)<<4) | ((systime.local_time.hour % 10) & 0xf);
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m_rtc.min = ((systime.local_time.minute / 10)<<4) | ((systime.local_time.minute % 10) & 0xf);
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m_rtc.sec = ((systime.local_time.second / 10)<<4) | ((systime.local_time.second % 10) & 0xf);
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void rtc9701_device::device_reset()
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{
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}
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//-------------------------------------------------
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// nvram_default - called to initialize NVRAM to
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// its default state
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//-------------------------------------------------
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void rtc9701_device::nvram_default()
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{
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for (offs_t offs = 0; offs < 0x100; offs++)
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rtc9701_data[offs] = 0xffff;
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}
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//-------------------------------------------------
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// nvram_read - called to read NVRAM from the
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// .nv file
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//-------------------------------------------------
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void rtc9701_device::nvram_read(emu_file &file)
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{
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file.read(rtc9701_data, 0x200);
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}
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//-------------------------------------------------
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// nvram_write - called to write NVRAM to the
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// .nv file
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//-------------------------------------------------
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void rtc9701_device::nvram_write(emu_file &file)
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{
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file.write(rtc9701_data, 0x200);
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}
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//-------------------------------------------------
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// rtc_read - used to route RTC reading registers
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//-------------------------------------------------
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inline UINT8 rtc9701_device::rtc_read(UINT8 offset)
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{
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UINT8 res;
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res = 0;
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switch(offset)
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{
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case 0: res = m_rtc.sec; break;
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case 1: res = m_rtc.min; break;
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case 2: res = m_rtc.hour; break;
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case 3: res = m_rtc.wday; break; /* untested */
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case 4: res = m_rtc.day; break;
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case 5: res = m_rtc.month; break;
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case 6: res = m_rtc.year & 0xff; break;
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case 7: res = 0x20; break;
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}
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return res;
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}
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inline void rtc9701_device::rtc_write(UINT8 offset,UINT8 data)
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{
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switch(offset)
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{
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case 0: m_rtc.sec = data; break;
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case 1: m_rtc.min = data; break;
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case 2: m_rtc.hour = data; break;
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case 3: m_rtc.wday = data; break; /* untested */
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case 4: m_rtc.day = data; break;
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case 5: m_rtc.month = data; break;
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case 6: m_rtc.year = data; break;
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case 7: break; // NOP
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}
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}
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//**************************************************************************
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// READ/WRITE HANDLERS
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//**************************************************************************
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WRITE_LINE_MEMBER( rtc9701_device::write_bit )
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{
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m_latch = state;
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}
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READ_LINE_MEMBER( rtc9701_device::read_bit )
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{
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if (rtc_state == RTC9701_RTC_READ)
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{
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//printf("RTC data bits left c9701_data_pos %02x\n", rtc9701_data_pos);
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return ((rtc9701_current_data) >> (rtc9701_data_pos-1))&1;
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}
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else if (rtc_state == RTC9701_EEPROM_READ)
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{
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//printf("EEPROM data bits left c9701_data_pos %02x\n", rtc9701_data_pos);
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return ((rtc9701_current_data) >> (rtc9701_data_pos-1))&1;
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}
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else
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{
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//printf("read something else (status?) %02x\n", rtc9701_data_pos);
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}
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return 0;
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}
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WRITE_LINE_MEMBER( rtc9701_device::set_cs_line )
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{
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//logerror("set reset line %d\n",state);
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m_reset_line = state;
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if (m_reset_line != CLEAR_LINE)
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{
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rtc_state = RTC9701_CMD_WAIT;
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cmd_stream_pos = 0;
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current_cmd = 0;
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rtc9701_address_pos = 0;
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rtc9701_current_address = 0;
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rtc9701_current_data = 0;
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rtc9701_data_pos = 0;
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}
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}
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WRITE_LINE_MEMBER( rtc9701_device::set_clock_line )
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{
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//logerror("set clock line %d\n",state);
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if (m_reset_line == CLEAR_LINE)
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{
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if (state==1)
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{
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//logerror("write latched bit %d\n",m_latch);
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switch (rtc_state)
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{
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case RTC9701_CMD_WAIT:
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//logerror("xx\n");
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current_cmd = (current_cmd << 1) | (m_latch&1);
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cmd_stream_pos++;
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if (cmd_stream_pos==4)
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{
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cmd_stream_pos = 0;
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//logerror("Comamnd is %02x\n", current_cmd);
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if (current_cmd==0x00) /* 0000 */
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{
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//logerror("WRITE RTC MODE\n");
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rtc_state = RTC9701_RTC_WRITE;
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cmd_stream_pos = 0;
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rtc9701_address_pos = 0;
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rtc9701_current_address = 0;
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rtc9701_data_pos = 0;
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rtc9701_current_data = 0;
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}
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else if (current_cmd==0x02) /* 0010 */
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{
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//logerror("WRITE EEPROM MODE\n");
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rtc_state = RTC9701_EEPROM_WRITE;
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cmd_stream_pos = 0;
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rtc9701_address_pos = 0;
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rtc9701_current_address = 0;
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rtc9701_data_pos = 0;
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rtc9701_current_data = 0;
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}
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else if (current_cmd==0x06) /* 0110 */
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{
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//logerror("WRITE ENABLE\n");
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rtc_state = RTC9701_AFTER_WRITE_ENABLE;
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cmd_stream_pos = 0;
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}
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else if (current_cmd==0x08) /* 1000 */
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{
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//logerror("READ RTC MODE\n");
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rtc_state = RTC9701_RTC_READ;
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cmd_stream_pos = 0;
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rtc9701_address_pos = 0;
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rtc9701_current_address = 0;
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rtc9701_data_pos = 0;
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rtc9701_current_data = 0;
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}
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else if (current_cmd==0x0a) /* 1010 */
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{
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//logerror("READ EEPROM MODE\n");
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rtc_state = RTC9701_EEPROM_READ;
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cmd_stream_pos = 0;
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rtc9701_address_pos = 0;
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rtc9701_current_address = 0;
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rtc9701_data_pos = 0;
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rtc9701_current_data = 0;
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}
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else
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{
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//logerror("RTC9701 UNKNOWN MODE\n");
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}
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current_cmd = 0;
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}
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break;
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case RTC9701_AFTER_WRITE_ENABLE:
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cmd_stream_pos++;
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if (cmd_stream_pos==12)
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{
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cmd_stream_pos = 0;
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//logerror("Written 12 bits, going back to WAIT mode\n");
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rtc_state = RTC9701_CMD_WAIT;
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}
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break;
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case RTC9701_RTC_WRITE:
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cmd_stream_pos++;
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if (cmd_stream_pos<=4)
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{
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rtc9701_address_pos++;
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rtc9701_current_address = (rtc9701_current_address << 1) | (m_latch&1);
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if (cmd_stream_pos==4)
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{
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//printf("Set RTC Write Address To %04x\n", rtc9701_current_address );
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}
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}
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if (cmd_stream_pos>4)
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{
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rtc9701_data_pos++;
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rtc9701_current_data = (rtc9701_current_data << 1) | (m_latch&1);;
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}
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if (cmd_stream_pos==12)
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{
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cmd_stream_pos = 0;
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rtc_write(rtc9701_current_address,rtc9701_current_data);
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//logerror("Written 12 bits, going back to WAIT mode\n");
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rtc_state = RTC9701_CMD_WAIT;
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}
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break;
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case RTC9701_EEPROM_READ:
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cmd_stream_pos++;
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if (cmd_stream_pos<=12)
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{
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rtc9701_address_pos++;
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rtc9701_current_address = (rtc9701_current_address << 1) | (m_latch&1);
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if (cmd_stream_pos==12)
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{
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//printf("Set EEPROM Read Address To %04x - ", (rtc9701_current_address>>1)&0xff );
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rtc9701_current_data = rtc9701_data[(rtc9701_current_address>>1)&0xff];
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//printf("Setting data latch for reading to %04x\n", rtc9701_current_data);
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rtc9701_data_pos = 16;
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}
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}
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if (cmd_stream_pos>12)
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{
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rtc9701_data_pos--;
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}
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if (cmd_stream_pos==28)
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{
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cmd_stream_pos = 0;
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// //logerror("accesed 28 bits, going back to WAIT mode\n");
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// rtc_state = RTC9701_CMD_WAIT;
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}
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break;
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case RTC9701_EEPROM_WRITE:
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cmd_stream_pos++;
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if (cmd_stream_pos<=12)
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{
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rtc9701_address_pos++;
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rtc9701_current_address = (rtc9701_current_address << 1) | (m_latch&1);
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if (cmd_stream_pos==12)
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{
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//printf("Set EEPROM Write Address To %04x\n", rtc9701_current_address );
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}
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}
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if (cmd_stream_pos>12)
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{
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rtc9701_data_pos++;
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rtc9701_current_data = (rtc9701_current_data << 1) | (m_latch&1);;
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}
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if (cmd_stream_pos==28)
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{
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cmd_stream_pos = 0;
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//printf("written 28 bits - writing data %04x to %04x and going back to WAIT mode\n", rtc9701_current_data, (rtc9701_current_address>>1)&0xff);
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rtc9701_data[(rtc9701_current_address>>1)&0xff] = rtc9701_current_data;
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rtc_state = RTC9701_CMD_WAIT;
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}
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break;
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case RTC9701_RTC_READ:
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cmd_stream_pos++;
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if (cmd_stream_pos<=4)
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{
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rtc9701_address_pos++;
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rtc9701_current_address = (rtc9701_current_address << 1) | (m_latch&1);
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if (cmd_stream_pos==4)
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{
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//printf("Set RTC Read Address To %04x\n", rtc9701_current_address );
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rtc9701_current_data = rtc_read(rtc9701_current_address);
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//printf("Setting data latch for reading to %04x\n", rtc9701_current_data);
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rtc9701_data_pos = 8;
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}
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}
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if (cmd_stream_pos>4)
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{
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rtc9701_data_pos--;
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}
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if (cmd_stream_pos==12)
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{
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cmd_stream_pos = 0;
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// //logerror("accessed 12 bits, going back to WAIT mode\n");
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// rtc_state = RTC9701_CMD_WAIT;
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}
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break;
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default:
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break;
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}
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}
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}
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}
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