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RTC9701: Implemented RTC register reading and RTC time increment [Angelo Salese]

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This commit is contained in:
Angelo Salese 2011-10-16 19:07:12 +00:00
parent f172af881e
commit 56fc996ff3
2 changed files with 54 additions and 6 deletions
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52
src/emu/machine/rtc9701.c
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@ -40,9 +40,36 @@ rtc9701_device::rtc9701_device(const machine_config &mconfig, const char *tag, d
}
void rtc9701_device::timer_callback()
{
static const UINT8 dpm[12] = { 0x31, 0x28, 0x31, 0x30, 0x31, 0x30, 0x31, 0x31, 0x30, 0x31, 0x30, 0x31 };
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++; m_rtc.hour = 0; }
if((m_rtc.wday & 0x0f) >= 0x07) { m_rtc.wday = 0; }
if((m_rtc.day & 0x0f) >= 0x0a) { m_rtc.day+=0x10; m_rtc.day&=0xf0; }
/* TODO: crude leap year support */
if(((m_rtc.year % 4) == 0) && m_rtc.month == 2)
{
if((m_rtc.day & 0xff) >= dpm[m_rtc.month-1]+1+1)
{ m_rtc.month++; m_rtc.day = 0x01; }
}
else if((m_rtc.day & 0xff) >= dpm[m_rtc.month-1]+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
}
TIMER_CALLBACK( rtc9701_device::rtc_inc_callback )
{
reinterpret_cast<rtc9701_device *>(ptr)->timer_callback();
}
//-------------------------------------------------
@ -65,6 +92,17 @@ void rtc9701_device::device_start()
/* let's call the timer callback every second */
if(clock() >= XTAL_32_768kHz)
machine().scheduler().timer_pulse(attotime::from_hz(clock() / XTAL_32_768kHz), FUNC(rtc_inc_callback), 0, (void *)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 = ((systime.local_time.weekday % 10) & 0xf);
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);
}
@ -125,12 +163,16 @@ inline UINT8 rtc9701_device::rtc_read(UINT8 offset)
switch(offset)
{
case 0: // seconds
res = 0x11;
break;
case 0: res = m_rtc.sec; break;
case 1: res = m_rtc.min; break;
case 2: res = m_rtc.hour; break;
case 3: res = 1 << m_rtc.wday; break; /* untested */
case 4: res = m_rtc.day; break;
case 5: res = m_rtc.month; break;
case 6: res = m_rtc.year & 0xff; break;
case 7: res = 0x20; break;
}
return res;
}

8
src/emu/machine/rtc9701.h
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@ -37,6 +37,11 @@ typedef enum
} rtc9701_state_t;
typedef struct
{
UINT8 sec, min, hour, day, wday, month, year;
} rtc_regs_t;
// ======================> rtc9701_device
@ -53,6 +58,7 @@ public:
DECLARE_READ_LINE_MEMBER( read_bit );
DECLARE_WRITE_LINE_MEMBER( set_cs_line );
DECLARE_WRITE_LINE_MEMBER( set_clock_line );
void timer_callback();
protected:
// device-level overrides
@ -85,7 +91,7 @@ protected:
UINT16 rtc9701_data[0x100];
rtc_regs_t m_rtc;
};