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// license:BSD-3-Clause
// copyright-holders:Angelo Salese
/***************************************************************************
AICA-RTC sub-device
TODO:
- move this inside AICA sound core once that'll get modernized
***************************************************************************/
#include "emu.h"
#include "machine/aicartc.h"
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
// device type definition
DEFINE_DEVICE_TYPE(AICARTC, aicartc_device, "aicartc", "AICA RTC")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// aicartc_device - constructor
//-------------------------------------------------
aicartc_device::aicartc_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, AICARTC, tag, owner, clock)
, device_rtc_interface(mconfig, *this)
, m_rtc_reg_lo(0), m_rtc_reg_hi(0), m_rtc_tick(0), m_we(0)
, m_clock_timer(nullptr)
{
}
//-------------------------------------------------
// device_validity_check - perform validity checks
// on this device
//-------------------------------------------------
void aicartc_device::device_validity_check(validity_checker &valid) const
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void aicartc_device::device_start()
{
m_clock_timer = timer_alloc(FUNC(aicartc_device::clock_tick), this);
m_clock_timer->adjust(attotime::from_hz(clock()), 0, attotime::from_hz(clock()));
}
//-------------------------------------------------
// rtc_clock_updated -
//-------------------------------------------------
void aicartc_device::rtc_clock_updated(int year, int month, int day, int day_of_week, int hour, int minute, int second)
{
const int month_to_day_conversion[12] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
// put the seconds
uint32_t current_time = second;
// put the minutes
current_time += minute * 60;
// put the hours
current_time += hour * 60 * 60;
// put the days (note -1) */
current_time += (day - 1) * 60 * 60 * 24;
// take the months - despite popular beliefs, leap years aren't just evenly divisible by 4 */
if (((((year % 4) == 0) && ((year % 100) != 0)) || ((year % 400) == 0)) && month > 2)
current_time += (month_to_day_conversion[month - 1] + 1) * 60 * 60 * 24;
else
current_time += (month_to_day_conversion[month - 1]) * 60 * 60 * 24;
// put the years
int year_count = (year - 1949);
for (int i = 0; i < year_count - 1; i++)
current_time += (((((i+1950) % 4) == 0) && (((i+1950) % 100) != 0)) || (((i+1950) % 400) == 0)) ? 60*60*24*366 : 60*60*24*365;
m_rtc_reg_lo = current_time & 0x0000ffff;
m_rtc_reg_hi = (current_time & 0xffff0000) >> 16;
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void aicartc_device::device_reset()
{
m_rtc_tick = 0;
}
//-------------------------------------------------
// clock_tick - advance the RTC counter
//-------------------------------------------------
TIMER_CALLBACK_MEMBER(aicartc_device::clock_tick)
{
m_rtc_tick++;
if(m_rtc_tick & 0x8000)
{
m_rtc_tick = 0;
m_rtc_reg_lo++;
if(m_rtc_reg_lo == 0)
m_rtc_reg_hi++;
}
}
//**************************************************************************
// READ/WRITE HANDLERS
//**************************************************************************
uint16_t aicartc_device::read(offs_t offset)
{
uint16_t res;
res = 0;
switch(offset)
{
case 0:
res = m_rtc_reg_hi; break;
case 1:
res = m_rtc_reg_lo; break;
}
return res;
}
void aicartc_device::write(offs_t offset, uint16_t data, uint16_t mem_mask)
{
switch(offset)
{
case 0:
if(m_we)
{
COMBINE_DATA(&m_rtc_reg_hi);
m_we = 0;
}
break;
case 1:
if(m_we)
{
COMBINE_DATA(&m_rtc_reg_lo);
m_rtc_tick = 0; // low register also clears tick count
}
break;
case 2:
m_we = data & 1;
break;
}
}
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