// license:BSD-3-Clause
// copyright-holders:Angelo Salese
/***************************************************************************
v3021.c
EM Microelectronic-Marin SA Ultra Low Power 32kHz CMOS RTC (DIP8)
Serial Real Time Clock
- very preliminary, borrowed from hard-coded PGM implementation.
***************************************************************************/
#include "emu.h"
#include "machine/v3021.h"
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
// device type definition
const device_type v3021 = device_creator<v3021_device>;
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// v3021_device - constructor
//-------------------------------------------------
v3021_device::v3021_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, v3021, "V3021 RTC", tag, owner, clock, "v3021", __FILE__), m_cal_mask(0), m_cal_com(0), m_cal_cnt(0), m_cal_val(0)
{
}
TIMER_CALLBACK_MEMBER(v3021_device::timer_callback)
{
static const uint8_t dpm[12] = { 0x31, 0x28, 0x31, 0x30, 0x31, 0x30, 0x31, 0x31, 0x30, 0x31, 0x30, 0x31 };
int dpm_count;
m_rtc.sec++;
if((m_rtc.sec & 0x0f) >= 0x0a) { m_rtc.sec+=0x10; m_rtc.sec&=0xf0; }
if((m_rtc.sec & 0xf0) >= 0x60) { m_rtc.min++; m_rtc.sec = 0; }
if((m_rtc.min & 0x0f) >= 0x0a) { m_rtc.min+=0x10; m_rtc.min&=0xf0; }
if((m_rtc.min & 0xf0) >= 0x60) { m_rtc.hour++; m_rtc.min = 0; }
if((m_rtc.hour & 0x0f) >= 0x0a) { m_rtc.hour+=0x10; m_rtc.hour&=0xf0; }
if((m_rtc.hour & 0xff) >= 0x24) { m_rtc.day++; m_rtc.wday<<=1; m_rtc.hour = 0; }
if(m_rtc.wday & 0x80) { m_rtc.wday = 1; }
if((m_rtc.day & 0x0f) >= 0x0a) { m_rtc.day+=0x10; m_rtc.day&=0xf0; }
/* TODO: crude leap year support */
dpm_count = (m_rtc.month & 0xf) + (((m_rtc.month & 0x10) >> 4)*10)-1;
if(((m_rtc.year % 4) == 0) && m_rtc.month == 2)
{
if((m_rtc.day & 0xff) >= dpm[dpm_count]+1+1)
{ m_rtc.month++; m_rtc.day = 0x01; }
}
else if((m_rtc.day & 0xff) >= dpm[dpm_count]+1){ m_rtc.month++; m_rtc.day = 0x01; }
if((m_rtc.month & 0x0f) >= 0x0a) { m_rtc.month = 0x10; }
if(m_rtc.month >= 0x13) { m_rtc.year++; m_rtc.month = 1; }
if((m_rtc.year & 0x0f) >= 0x0a) { m_rtc.year+=0x10; m_rtc.year&=0xf0; }
if((m_rtc.year & 0xf0) >= 0xa0) { m_rtc.year = 0; } //2000-2099 possible timeframe
}
//-------------------------------------------------
// device_validity_check - perform validity checks
// on this device
//-------------------------------------------------
void v3021_device::device_validity_check(validity_checker &valid) const
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void v3021_device::device_start()
{
/* let's call the timer callback every second */
machine().scheduler().timer_pulse(attotime::from_hz(clock() / XTAL_32_768kHz), timer_expired_delegate(FUNC(v3021_device::timer_callback),this));
system_time systime;
machine().base_datetime(systime);
m_rtc.day = ((systime.local_time.mday / 10)<<4) | ((systime.local_time.mday % 10) & 0xf);
m_rtc.month = (((systime.local_time.month+1) / 10) << 4) | (((systime.local_time.month+1) % 10) & 0xf);
m_rtc.wday = 1 << systime.local_time.weekday;
m_rtc.year = (((systime.local_time.year % 100)/10)<<4) | ((systime.local_time.year % 10) & 0xf);
m_rtc.hour = ((systime.local_time.hour / 10)<<4) | ((systime.local_time.hour % 10) & 0xf);
m_rtc.min = ((systime.local_time.minute / 10)<<4) | ((systime.local_time.minute % 10) & 0xf);
m_rtc.sec = ((systime.local_time.second / 10)<<4) | ((systime.local_time.second % 10) & 0xf);
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void v3021_device::device_reset()
{
m_cal_cnt = 0;
}
//**************************************************************************
// READ/WRITE HANDLERS
//**************************************************************************
READ8_MEMBER( v3021_device::read )
{
uint8_t calr = (m_cal_val & m_cal_mask) ? 1 : 0;
m_cal_mask <<= 1;
return calr;
}
WRITE8_MEMBER( v3021_device::write )
{
m_cal_com <<= 1;
m_cal_com |= data & 1;
++m_cal_cnt;
if (m_cal_cnt == 4)
{
m_cal_mask = 1;
m_cal_val = 1;
m_cal_cnt = 0;
switch (m_cal_com & 0xf)
{
case 1: case 3: case 5: case 7: case 9: case 0xb: case 0xd:
m_cal_val++;
break;
case 0:
m_cal_val = (m_rtc.wday); //??
break;
case 2: //Hours
m_cal_val = (m_rtc.hour);
break;
case 4: //Seconds
m_cal_val = (m_rtc.sec);
break;
case 6: //Month
m_cal_val = (m_rtc.month); //?? not bcd in MVS
break;
case 8:
m_cal_val = 0; //Controls blinking speed, maybe milliseconds
break;
case 0xa: //Day
m_cal_val = (m_rtc.day);
break;
case 0xc: //Minute
m_cal_val = (m_rtc.min);
break;
case 0xe: //Year
m_cal_val = (m_rtc.year % 100);
break;
case 0xf: //Load Date
//space.machine().base_datetime(m_systime);
break;
}
}
}